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Adsorption behavior of CO_(2)/H_(2)S mixtures in calcite slit nanopores for CO_(2) storage:An insight from molecular perspective
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作者 Cheng Qian Zhen-Hua Rui +4 位作者 Yue-Liang Liu Kai Du Chen Liu Yang Zhao Xiao-Min Ma 《Petroleum Science》 SCIE EI CAS CSCD 2024年第4期2444-2456,共13页
It is acknowledged that injecting CO_(2) into oil reservoirs and saline aquifers for storage is a practical and affordable method for CO_(2) sequestration.Most CO_(2) produced from industrial exhaust contains impurity... It is acknowledged that injecting CO_(2) into oil reservoirs and saline aquifers for storage is a practical and affordable method for CO_(2) sequestration.Most CO_(2) produced from industrial exhaust contains impurity gases such as H_(2)S that might impact CO_(2) sequestration due to competitive adsorption.This study makes a commendable effort to explore the adsorption behavior of CO_(2)/H_(2)S mixtures in calcite slit nanopores.Grand Canonical Monte Carlo(GCMC)simulation is employed to reveal the adsorption of CO_(2),H_(2)S as well as their binary mixtures in calcite nanopores.Results show that the increase in pressure and temperature can promote and inhibit the adsorption capacity of CO_(2) and H_(2)S in calcite nanopores,respectively.CO_(2)exhibits stronger adsorption on calcite surface than H_(2)S.Electrostatic energy plays the dominating role in the adsorption behavior.Electrostatic energy accounts for 97.11%of the CO_(2)-calcite interaction energy and 56.33%of the H_(2)S-calcite interaction energy at 10 MPa and 323.15 K.The presence of H_(2)S inhibits the CO_(2) adsorption in calcite nanopores due to competitive adsorption,and a higher mole fraction of H_(2)S leads to less CO_(2) adsorption.The quantity of CO_(2) adsorbed is lessened by approximately 33%when the mole fraction of H_(2)S reaches 0.25.CO_(2) molecules preferentially occupy the regions near the po re wall and H_(2)S molecules tend to reside at the center of nanopore even when the molar ratio of CO_(2) is low,indicating that CO_(2) has an adsorption priority on the calcite surface over H_(2)S.In addition,moisture can weaken the adsorption of both CO_(2) and H_(2)S,while CO_(2) is more affected.More interestingly,we find that pure CO_(2) is more suitable to be sequestrated in the shallower formations,i.e.,500-1500 m,whereas CO_(2)with H_(2)S impurity should be settled in the deeper reservoirs. 展开更多
关键词 adsorption behavior CO_(2)/H_(2)S binary mixtures Molecular perspective Calcite slit nanopores CO_(2)sequestration
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Fine quantitative characterization of high-H2S gas reservoirs under the influence of liquid sulfur deposition and adsorption
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作者 LI Tong MA Yongsheng +3 位作者 ZENG Daqian LI Qian ZHAO Guang SUN Ning 《Petroleum Exploration and Development》 SCIE 2024年第2期416-429,共14页
In order to clarify the influence of liquid sulfur deposition and adsorption to high-H2S gas reservoirs,three types of natural cores with typical carbonate pore structures were selected for high-temperature and high-p... In order to clarify the influence of liquid sulfur deposition and adsorption to high-H2S gas reservoirs,three types of natural cores with typical carbonate pore structures were selected for high-temperature and high-pressure core displacement experiments.Fine quantitative characterization of the cores in three steady states(original,after sulfur injection,and after gas flooding)was carried out using the nuclear magnetic resonance(NMR)transverse relaxation time spectrum and imaging,X-ray computer tomography(CT)of full-diameter cores,basic physical property testing,and field emission scanning electron microscopy imaging.The loss of pore volume caused by sulfur deposition and adsorption mainly comes from the medium and large pores with sizes bigger than 1000μm.Liquid sulfur has a stronger adsorption and deposition ability in smaller pore spaces,and causes greater damage to reservoirs with poor original pore structures.The pore structure of the three types of carbonate reservoirs shows multiple fractal characteristics.The worse the pore structure,the greater the change of internal pore distribution caused by liquid sulfur deposition and adsorption,and the stronger the heterogeneity.Liquid sulfur deposition and adsorption change the pore size distribution,pore connectivity,and heterogeneity of the rock,which further changes the physical properties of the reservoir.After sulfur injection and gas flooding,the permeability of TypeⅠreservoirs with good physical properties decreased by 16%,and that of TypesⅡandⅢreservoirs with poor physical properties decreased by 90%or more,suggesting an extremely high damage.This indicates that the worse the initial physical properties,the greater the damage of liquid sulfur deposition and adsorption.Liquid sulfur is adsorbed and deposited in different types of pore space in the forms of flocculence,cobweb,or retinitis,causing different changes in the pore structure and physical property of the reservoir. 展开更多
关键词 high-H2S gas reservoir liquid sulfur adsorption and deposition pore structure physical property reservoir characterization
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Study of the reaction mechanism for preparing powdered activated coke with SO_(2)adsorption capability via one-step rapid activation method under flue gas atmosphere
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作者 Binxuan Zhou Jingcai Chang +5 位作者 Jun Li Jinglan Hong Tao Wang Liqiang Zhang Ping Zhou Chunyuan Ma 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第1期158-168,共11页
In this study,the impact of different reaction times on the preparation of powdered activated carbon(PAC)using a one-step rapid activation method under flue gas atmosphere is investigated,and the underlying reaction m... In this study,the impact of different reaction times on the preparation of powdered activated carbon(PAC)using a one-step rapid activation method under flue gas atmosphere is investigated,and the underlying reaction mechanism is summarized.Results indicate that the reaction process of this method can be divided into three stages:stage I is the rapid release of volatiles and the rapid consumption of O_(2),primarily occurring within a reaction time range of 0-0.5 s;stage II is mainly the continuous release and diffusion of volatiles,which is the carbonization and activation coupling reaction stage,and the carbonization process is the main in this stage.This stage mainly occurs at the reaction time range of 0.5 -2.0 s when SL-coal is used as material,and that is 0.5-3.0 s when JJ-coal is used as material;stage III is mainly the activation stage,during which activated components diffuse to both the surface and interior of particles.This stage mainly involves the reaction stage of CO_(2)and H2O(g)activation,and it mainly occurs at the reaction time range of 2.0-4.0 s when SL-coal is used as material,and that is 3.0-4.0 s when JJ-coal is used as material.Besides,the main function of the first two stages is to provide more diffusion channels and contact surfaces/activation sites for the diffusion and activation of the activated components in the third stage.Mastering the reaction mechanism would serve as a crucial reference and foundation for designing the structure,size of the reactor,and optimal positioning of the activator nozzle in PAC preparation. 展开更多
关键词 Reaction mechanism Powdered activated coke preparation SO_(2)adsorption One-step rapid activation Flue gas atmosphere
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A functionalized activated carbon adsorbent prepared from waste amidoxime resin by modifying with H_(3)PO_(4) and ZnCl_(2) and its excellent Cr(Ⅵ)adsorption
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作者 Chunlin He Yun Liu +6 位作者 Mingwei Qi Zunzhang Liu Yuezhou Wei Toyohisa Fujita Guifang Wang Shaojian Ma Wenchao Yang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第3期585-598,共14页
With the application of resins in various fields, numerous waste resins that are difficult to treat have been produced. The industrial wastewater containing Cr(Ⅵ) has severely polluted soil and groundwater environmen... With the application of resins in various fields, numerous waste resins that are difficult to treat have been produced. The industrial wastewater containing Cr(Ⅵ) has severely polluted soil and groundwater environments, thereby endangering human health. Therefore, in this paper, a novel functionalized mesoporous adsorbent PPR-Z was synthesized from waste amidoxime resin for adsorbing Cr(Ⅵ). The waste amidoxime resin was first modified with H3PO4 and ZnCl_(2), and subsequently, it was carbonized through slow thermal decomposition. The static adsorption of PPR-Z conforms to the pseudo-second-order kinetic model and Langmuir isotherm, indicating that the Cr(Ⅵ) adsorption by PPR-Z is mostly chemical adsorption and exhibits single-layer adsorption. The saturated adsorption capacity of the adsorbent for Cr(Ⅵ) could reach 255.86 mg/g. The adsorbent could effectively reduce Cr(Ⅵ) to Cr(Ⅲ) and decrease the toxicity of Cr(Ⅵ) during adsorption. PPR-Z exhibited Cr(Ⅵ) selectivity in electroplating wastewater. The main mechanisms involved in the Cr(Ⅵ) adsorption are the chemical reduction of Cr(Ⅵ) into Cr(Ⅲ) and electrostatic and coordination interactions. Preparation of PPR-Z not only solves the problem of waste resin treatment but also effectively controls Cr(Ⅵ) pollution and realizes the concept of “treating waste with waste”. 展开更多
关键词 waste amidoxime resin mesoporous adsorbent H_(3)PO_(4)and ZnCl_(2)processing Cr(VI)adsorption electroplating wastewater
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C50混凝土的制备及其对Cs^(+)、Ni^(2+)的吸附性能研究
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作者 杨雪颖 阳刚 +1 位作者 洪涛 冷阳春 《核技术》 EI CAS CSCD 北大核心 2024年第10期77-87,共11页
为研究处置库屏障材料混凝土对放射性核素的阻滞能力,制备了C50混凝土材料并研究其对放射性核素的吸附能力。发现屏障材料C50混凝土主要由含钙和铝的硅酸盐矿物组成,其在微观尺度下呈现不规则多面体与板层结构,比表面积为2.786 m^(2)... 为研究处置库屏障材料混凝土对放射性核素的阻滞能力,制备了C50混凝土材料并研究其对放射性核素的吸附能力。发现屏障材料C50混凝土主要由含钙和铝的硅酸盐矿物组成,其在微观尺度下呈现不规则多面体与板层结构,比表面积为2.786 m^(2)·g^(-1),且具有较强的非定形特征。通过吸附试验,发现实验条件下C50混凝土对Cs^(+)、Ni^(2+)具有较好的吸附能力,达到平衡后对Cs^(+)的K_(d)值达到19.400 L·mg^(-1),吸附容量达到0.316 mg·g^(-1);吸附Ni^(2+)的K_(d)值达到465.142 L·mg^(-1),吸附容量达到96.375 mg·g^(-1)。随着Cs^(+)、Ni^(2+)初始浓度的增大,C50混凝土对Cs^(+)的K_(d)值逐渐减小后趋于稳定,对Ni^(2+)的K_(d)值逐渐减小后稳定增大,吸附容量均逐渐增大。通过环境因素影响试验,发现实验条件下pH对C50混凝土吸附Cs^(+)的影响相对较小,C50混凝土对Ni^(2+)的能力随着pH上升而增大。不同离子对Cs^(+)抑制作用由大到小的顺序依次为:K^(+)、Ca^(2+)、Mg^(2+)、SO_(4)^(2-)、Cl^(-)、NO_(3)^(-),随着温度的升高,C50混凝土对Cs^(+)的吸附能力缓慢减小;对Ni^(2+)抑制作用从大到小的顺序依次为:Mg^(2+)、Ca^(2+)、SO_(4)^(2-)、CO_(3)^(2-)。Ni^(2+)的吸附能力随着温度上升缓慢增大。研究结果可为处置库的建设提供基础数据支持。 展开更多
关键词 C50混凝土 Ni^(2+) Cs^(+) 吸附
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Al/Ga离子替换提升Ni^(2+)掺杂尖晶石结构MgAl_(x)Ga_(2-x)O_(4)近红外二区发光特性
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作者 杨宜晨 吕伟 康晓娇 《发光学报》 EI CAS CSCD 北大核心 2024年第11期1839-1848,共10页
近红外荧光转换发光二极管(pc-LED)在成像和检测领域的快速发展突显了对近红外二区(NIR-Ⅱ区)发光材料的迫切需求。然而,商用紫外LED芯片激发的高效NIR-Ⅱ荧光材料匮乏,制约了近红外光谱技术的应用。本文通过高温固相法成功制备了MgAl_(... 近红外荧光转换发光二极管(pc-LED)在成像和检测领域的快速发展突显了对近红外二区(NIR-Ⅱ区)发光材料的迫切需求。然而,商用紫外LED芯片激发的高效NIR-Ⅱ荧光材料匮乏,制约了近红外光谱技术的应用。本文通过高温固相法成功制备了MgAl_(x)Ga_(2-x)O_(4)∶Ni^(2+)荧光材料,该材料的激发波长为390 nm,发射峰位于1300 nm,覆盖了NIR-Ⅱ区域。半高宽约为220 nm的超宽带NIR发射是由于Ni^(2+)处于一个弱晶体场环境中,这种环境是由于MgAl_(x)Ga_(2-x)O_(4)基体中[(Al/Ga)O_(6)]八面体中心周围的高电荷极化导致的空间不对称畸变造成的。通过改变体系中Al^(3+)与Ga^(3+)的离子比例,将NIR-Ⅱ区的发射强度大大提高,发光强度提升为原来的9倍左右。着重研究了Ni^(2+)掺杂最优比例MgAl_(1.5)Ga_(0.5)O_(4)的光谱特性。探讨了体系的温度特性,使用掺Ni^(2+)的近红外荧光粉和商业高效紫外LED芯片(@395 nm)构建了NIR pc-LED,研究表明该材料体系可能在pc-LED光谱技术中展现出较大潜力。这种阳离子调制策略将给近红外发光材料的性能提升提供有效的方法。 展开更多
关键词 荧光粉 Ni^(2+)掺杂 阳离子替换 NIR pc-LED
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Insights into carbon dioxide sequestration into coal seams through coupled gas flow-adsorption-deformation modelling
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作者 Hywel Thomas Min Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第1期26-40,共15页
Injecting carbon dioxide(CO_(2))into coal seams may unlock substantial carbon sequestration potential.Since the coal acts like a carbon filter,it can preferentially absorb significant amounts of CO_(2).To explore this... Injecting carbon dioxide(CO_(2))into coal seams may unlock substantial carbon sequestration potential.Since the coal acts like a carbon filter,it can preferentially absorb significant amounts of CO_(2).To explore this further,desorption of the adsorbed gas due to pressure drop is investigated in this paper,to achieve an improved understanding of the long-term fate of injected CO_(2) during post-injection period.This paper presents a dual porosity model coupling gas flow,adsorption and geomechanics for studying coupled processes and effectiveness of CO_(2) sequestration in coals.A new adsorption?desorption model derived based on thermodynamics is incorporated,particularly,the desorption hysteresis is considered.The reliability of the proposed adsorption-desorption isotherm is examined via validation tests.It is indicated that occurrence of desorption hysteresis is attributed to the adsorption-induced pore deformation.After injection ceases,the injected gas continues to propagate further from the injection well,while the pressure in the vicinity of the injection well experiences a significant drop.Although the adsorbed gas near the well also decreases,this decrease is less compared to that in pressure because of desorption hysteresis.The unceasing spread of CO_(2) and drops of pressure and adsorbed gas depend on the degree of desorption hysteresis and heterogeneity of coals,which should be considered when designing CO_(2) sequestration into coal seams. 展开更多
关键词 CO_(2)geological storage Coal seam adsorption Desorption hysteresis
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Double plasma molecular adsorption system for Stevens–Johnson syndrome/toxic epidermal necrolysis:A case report
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作者 You-Wen Tan Li-Ping Liu Kai Zhang 《World Journal of Clinical Cases》 SCIE 2024年第7期1371-1377,共7页
BACKGROUND Stevens–Johnson syndrome and toxic epidermal necrolysis(SJS/TEN)are very serious skin allergies,with an etiology related to infections and medication.Since the coronavirus disease 2019(COVID-19)pandemic,se... BACKGROUND Stevens–Johnson syndrome and toxic epidermal necrolysis(SJS/TEN)are very serious skin allergies,with an etiology related to infections and medication.Since the coronavirus disease 2019(COVID-19)pandemic,severe acute respiratory syndrome coronavirus-2 has also been considered to cause SJS/TEN.CASE SUMMARY We report the case of a woman in her thirties who took acetaminophen after contracting COVID-19.After 3 d of fever relief,she experienced high fever and presented with SJS/TEN symptoms,accompanied by intrahepatic cholestasis.Three days of corticosteroid treatment did not alleviate the skin damage;therefore,double plasma molecular adsorption system(DPMAS)therapy was initiated,with treatment intervals of 48 h.Her skin symptoms improved gradually and were resolved after seven DPMAS treatments.CONCLUSION DPMAS therapy is beneficial for abrogating SJS/TEN because plasma adsorption and perfusion techniques reduce the inflammatory mediators(e.g.,tumor necrosis factor-alpha and interleukin-10 and-12)speculated to be involved in the pathology of the skin conditions. 展开更多
关键词 STEVENS-JOHNSON Toxic epidermal necrolysis COVID-19 Double plasma molecular adsorption system SARS-CoV-2 Case report
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蓝光激发的KMgF_(3)∶Cr^(3+)/Ni^(2+)基透明微晶玻璃超宽带近红外发光
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作者 赖俊欢 陈龙 刘雪云 《发光学报》 EI CAS CSCD 北大核心 2024年第7期1134-1144,共11页
近红外光谱技术在食品科学、信息安全、生物医疗等重大国计民生领域的应用对近红外光源提出了越来越高的要求。研发具有高效超宽带发射的近红外光源因此成为一项重要且迫切的研究课题。本文采用熔融淬火法在氟硅酸盐玻璃体系SiO_(2)-K_(... 近红外光谱技术在食品科学、信息安全、生物医疗等重大国计民生领域的应用对近红外光源提出了越来越高的要求。研发具有高效超宽带发射的近红外光源因此成为一项重要且迫切的研究课题。本文采用熔融淬火法在氟硅酸盐玻璃体系SiO_(2)-K_(2)CO_(3)-KF·2H_(2)O-MgF_(2)中成功析出了钙钛矿型KMgF_(3)纳米晶体。通过改变玻璃组分和热处理温度可以调控氟化物纳米晶相的析出,得到析晶和透明度最佳的微晶玻璃样品。玻璃中KMgF_(3)纳米晶体为Cr^(3+)和Ni^(2+)提供了稳定的八面体配位和低声子能量发光环境,在450 nm蓝光激发下,基于Cr^(3+)到Ni^(2+)的能量传递实现了Cr^(3+)(700~1200 nm)和Ni^(2+)(1400~1700 nm)双宽带近红外发射,并且双宽带近红外发光强度随离子掺杂浓度而可调变化。荧光光谱和荧光衰减曲线表征证明了Cr^(3+)到Ni^(2+)的能量传递过程,对应的能量传递效率为52.2%,能量传递机制为电子偶极-四极相互作用。研究结果不仅可以为系统掌握透明光学材料的超宽带发光规律提供基础数据,同时有助于设计开发低成本、高效率的近红外宽带光源。 展开更多
关键词 微晶玻璃 氟化物纳米晶体 宽带近红外发光 Cr^(3+)和Ni^(2+)
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Mechanochemical synthesis of oxygenated alkynyl carbon materials with excellent Hg(Ⅱ) adsorption performance from CaC2 and carbonates 被引量:1
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作者 Yingjie Li Songping Li +3 位作者 Xinyi Xu Hong Meng Yingzhou Lu Chunxi Li 《Green Energy & Environment》 SCIE EI CSCD 2023年第1期275-282,共8页
Adsorptive removal of heavy metal ions from wastewater is very important,and the key is the development of efficient sorbents.In this work,oxygenated alkynyl carbon materials(OACMs)were synthesized via mechanochemical... Adsorptive removal of heavy metal ions from wastewater is very important,and the key is the development of efficient sorbents.In this work,oxygenated alkynyl carbon materials(OACMs)were synthesized via mechanochemical reaction of CaC_(2) and a carbonate(CaCO_(3),Na2CO_(3),or NaHCO_(3))at ambient temperature.The resultant OACMs are micro mesoporous carbon nanomaterials with high specific area(>648 m2 g^(-1)),highly crosslinked texture,and rich alkynyl and oxygenated groups.The OACMs exhibit excellent Hg(Ⅱ)adsorption due to the soft acid-soft base interaction between alkynyl and Hg(Ⅱ),and OACM-3 derived from CaC_(2) and NaHCO_(3) has the saturated Hg(Ⅱ)adsorbance of 483.9 mg g^(-1)along with good selectivity and recyclability.The adsorption is mainly chemisorption following the Langmuir mode.OACM-3 also shows high adsorbance for other heavy metal ions,e.g.256.6 mg g^(-1)for Pb(II),232.4 mg g^(-1)for Zn(II),and 198.7 mg g^(-1)for Cu(II).This work expands the mechnochemical reaction of CaC_(2)with carbonates and possibly other oxyanionic salts,provides a new synthesis approach for functional alkynyl carbon materials with excellent adsorption performance for heavy metal ions,as well as a feasible approach for CO2 resource utilization. 展开更多
关键词 CaC_(2) MECHANOCHEMISTRY Alkynyl carbon materials Hg(Ⅱ) Heavy metal adsorption
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Integrated vacuum pressure swing adsorption and Rectisol process for CO_(2) capture from underground coal gasification syngas 被引量:1
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作者 Jian Wang Yuanhui Shen +2 位作者 Donghui Zhang Zhongli Tang Wenbin Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第5期265-279,共15页
An integrated vacuum pressure swing adsorption(VPSA) and Rectisol process is proposed for CO_(2) capture from underground coal gasification(UCG) syngas. A ten-bed VPSA process with silica gel adsorbent is firstly desi... An integrated vacuum pressure swing adsorption(VPSA) and Rectisol process is proposed for CO_(2) capture from underground coal gasification(UCG) syngas. A ten-bed VPSA process with silica gel adsorbent is firstly designed to pre-separate and capture 74.57% CO_(2) with a CO_(2) purity of 98.35% from UCG syngas(CH_(4)/CO/CO_(2)/H_(2)/N_(2)= 30.77%/6.15%/44.10%/18.46%/0.52%, mole fraction, from Shaar Lake Mine Field,Xinjiang Province, China) with a feed pressure of 3.5 MPa. Subsequently, the Rectisol process is constructed to furtherly remove and capture the residual CO_(2)remained in light product gas from the VPSA process using cryogenic methanol(233.15 K, 100%(mass)) as absorbent. A final purified gas with CO_(2) concentration lower than 3% and a regenerated CO_(2) product with CO_(2) purity higher than 95% were achieved by using the Rectisol process. Comparisons indicate that the energy consumption is deceased from 2.143 MJ·kg^(-1) of the single Rectisol process to 1.008 MJ·kg^(-1) of the integrated VPSA & Rectisol process, which demonstrated that the deployed VPSA was an energy conservation process for CO_(2) capture from UCG syngas. Additionally, the high-value gas(e.g., CH_(4)) loss can be decreased and the effects of key operating parameters on the process performances were detailed. 展开更多
关键词 Underground coal gasification Vacuum pressure swing adsorption Rectisol process CO_(2)capture Integrated process
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Amine-functionalized mesoporous UiO-66 aerogel for CO_(2) adsorption 被引量:1
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作者 Mengge Shang Jing Zhang +6 位作者 Jinqiang Sun Shimo Yu Feng Hua Xiaoxu Xuan Xun Sun Serguei Filatov Xibin Yi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第2期36-43,共8页
A mesoporous UiO-66-NH_(2) aerogel is prepared via a straightforward sol-gel method without using any binders or mechanical pressures, in which the amine groups are directly introduced into the matrix by using 2-amino... A mesoporous UiO-66-NH_(2) aerogel is prepared via a straightforward sol-gel method without using any binders or mechanical pressures, in which the amine groups are directly introduced into the matrix by using 2-aminoterephthalic acid. The novel UiO-66-NH_(2) aerogel also exhibits high specific surface area and mesopore-dominated structure, implying its highly potential use in CO_(2) adsorption. For ulteriorly investigating the effect of amine loading on the CO_(2) adsorption ability, a series of UiO-66-NH_(2) aerogel with different amino content is fabricated by changing the ligand/metal molar ratio. When the molar ratio is 1.45, the CO_(2) adsorption capacity reaches the optimum value of 2.13 mmol·g^(-1) at 25 ℃ and 0.1 MPa, which is 12.2% higher than that of pure UiO-66 aerogel. Additionally, UiO-66-NH_(2)-1.45 aerogel also has noticeable CO_(2) selectivity against N_(2) and CH_(4) as well as good regeneration stability. Such results imply that it has good application prospect in the field of CO_(2) adsorption, and also contains the potential to be applied in catalysis, separation and other fields. 展开更多
关键词 UiO-66-NH_(2)aerogel Sol–gel method Amine groups Nanostructure Carbon dioxide adsorption
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Comparative study of the adsorption performance of NH_(2)-functionalized metal organic frameworks with activated carbon composites for the treatment of phenolic wastewaters
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作者 Bolong Jiang Shunjie Shi +3 位作者 Yanyan Cui Jiayou Li Nan Jiang Yanguang Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第11期130-139,共10页
To better understand the role of the-NH_(2)group in adsorption process of phenolic wastewaters,NH_(2)-functionalized MIL-53(Al)composites with activated carbon(NH_(2)-M(Al)@(B)AC)were prepared.The results showed that ... To better understand the role of the-NH_(2)group in adsorption process of phenolic wastewaters,NH_(2)-functionalized MIL-53(Al)composites with activated carbon(NH_(2)-M(Al)@(B)AC)were prepared.The results showed that the-NH_(2)group could increase the mesopore volume for composites,which promotes mass transfer and full utilization of active sites,because hierarchical mesopore structure makes the adsorbent easier to enter the internal adsorption sites.Furthermore,the introduction of the-NH_(2)group can improve the adsorption capacity,decrease the activation energy,and enhance the interaction between the adsorbent and p-nitrophenol,demonstrating that the-NH_(2)group plays a crucial role in the adsorption of p-nitrophenol.The density functional theory calculation results show that the H-bond interaction between the-NH_(2)group in the adsorbent and the-NO_(2)in the p-nitrophenol(adsorption energy of -35.5 kJ·mol^(-1)),and base-acid interaction between the primary-NH_(2)group in the adsorbent and the acidic-OH group in the p-nitrophenol(adsorption energy of -27.3 kJ·mol^(-1))are predominant mechanisms for adsorption in terms of the NH_(2)-functionalized adsorbent.Both NH_(2)-functionalized M(Al)@AC and M(Al)@BAC composites exhibited higher p-nitrophenol adsorption capacity than corresponding nonfunctionalized composites.Among the composites,the NH_(2)-M(Al)@BAC had the highest p-nitrophenol adsorption capacity of 474 mg·g^(-1). 展开更多
关键词 NH_(2)-functionalized adsorbent Phenolic wastewaters adsorption Mechanism Density functional theory
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Stellerite-seeded facile synthesis of zeolite X with excellent aqueous Cd^(2+)and Ni^(2+)adsorption performance 被引量:2
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作者 Yinchang Pei Shengpeng Mo +4 位作者 Qinglin Xie Nanchun Chen Zhongxin Yang Lili Huang Lili Ma 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第11期61-74,共14页
Zeolite X was synthesized by a two-step hydrothermal method using natural stellerite zeolite as the silicon seed,and its adsorption performance for Cd^(2+)and Ni^(2+)ions was experimentally and comprehensively investi... Zeolite X was synthesized by a two-step hydrothermal method using natural stellerite zeolite as the silicon seed,and its adsorption performance for Cd^(2+)and Ni^(2+)ions was experimentally and comprehensively investigated.The effects of p H,zeolite X dosage,contact time,and temperature on adsorption performance for Cd^(2+)and Ni^(2+)ions over were studied.The adsorption process was endothermic and spontaneous,and followed the pseudo-second-order kinetic and the Langmuir isotherm models.The maximum adsorption capacitiesfor Cd^(2+)and Ni^(2+)ions at 298 K were 173.553 and 75.897 mg.g-1,respectively.Ion exchange and precipitation were the principal mechanisms for the removal of Cd^(2+)ions from aqueous solutions by zeolite X,followed by electrostatic adsorption.Ion exchange was the principal mechanisms for the removal of Ni^(2+)ions from aqueous solutions by zeolite X,followed by electrostatic adsorption and precipitation.The zeolite X converted from stellerite zeolite has a low n(Si/Al),abundant hydroxyl groups,and high crystallinity and purity,imparting a good adsorption performance for Cd^(2+)and Ni^(2+)ions.This study suggests that zeolite X converted from stellerite zeolite could be a useful environmentally-friendly and effective tool for the removal of Cd^(2+)and Ni^(2+)ions from aqueous solutions. 展开更多
关键词 Zeolite X Stellerite zeolite adsorption mechanism Cd^(2+)adsorption Ni^(2+)adsorption Ion exchange
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Synthesis of Li^+ adsorbent(H_2TiO_3) and its adsorption properties 被引量:9
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作者 石西昌 张志兵 +3 位作者 周定方 张丽芬 陈白珍 余亮良 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第1期253-259,共7页
H2TiO3 was obtained from the acid-modified adsorbent precursor Li2TiO3,which was synthesized by a solid-phase reaction between TiO2 and Li2CO3.The extraction ratio of Li+ from Li2TiO3 was 98.86%,almost with no Ti4+ ... H2TiO3 was obtained from the acid-modified adsorbent precursor Li2TiO3,which was synthesized by a solid-phase reaction between TiO2 and Li2CO3.The extraction ratio of Li+ from Li2TiO3 was 98.86%,almost with no Ti4+ extracted.The effects of lithium titanium ratio,calcining temperature and time were investigated on the synthesis of Li2TiO3.Li2TiO3,H2TiO3 and the adsorbed Li+ adsorbent were characterized by XRD and SEM.The lithium adsorption properties were investigated by the adsorption kinetics and adsorption isotherm.The results indicate that H2TiO3 has an excellent adsorptive capacity for Li+.Two simplified kinetic models including the pseudo-first-order and pseudo-second-order equations were selected to follow the adsorption processes.The rate constants of adsorption for these kinetic models were calculated.The results show that the adsorption process can be described by the pseudo-second-order equation,and the process is proved to be a chemical adsorption.The adsorption process that H2TiO3 adsorbs Li+ in LiCl solution well fits the Langmuir equation with monolayer adsorption. 展开更多
关键词 Li+ adsorbent Li2TiO3 adsorption property kinetic models monolayer adsorption TIO2 Li2CO3
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Flotation behavior and adsorption mechanism of(1-hydroxy-2-methyl-2-octenyl) phosphonic acid to cassiterite 被引量:15
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作者 谭鑫 何发钰 +1 位作者 尚衍波 印万忠 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2469-2478,共10页
The flotation behavior and adsorption mechanism of novel(1-hydroxy-2-methyl-2-octenyl) phosphonic acid(HEPA) to cassiterite were investigated by micro-flotation tests, zeta potential measurements, FTIR determinati... The flotation behavior and adsorption mechanism of novel(1-hydroxy-2-methyl-2-octenyl) phosphonic acid(HEPA) to cassiterite were investigated by micro-flotation tests, zeta potential measurements, FTIR determination and density functional theory(DFT) calculation. The flotation results demonstrated that HEPA exhibited superior collecting performance compared with styrene phosphonic acid(SPA). The cassiterite recovery maintained above 90% over a wide pH range of 2-9 with 50 mg/L HEPA. The results of zeta potential measurement and FTIR detection indicated that the adsorption of HEPA onto cassiterite was mainly attributed to the chemisorption between HEPA monoanions and Sn species on mineral surfaces. The DFT calculation results demonstrated that HEPA monoanions owned higher HOMO energy and exhibited a better affinity to cassiterite than SPA, which provided very clear evidence for the stronger collecting power of HEPA presented in floatation test and zeta potential measurement. 展开更多
关键词 (1-hydroxy-2-methyl-2-octenyl) phosphonic acid CASSITERITE adsorption FLOTATION density functional theory
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Adsorption mechanism of 2-mercaptobenzothiazole on chalcopyrite and sphalerite surfaces:Ab initio and spectroscopy studies 被引量:3
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作者 焦芬 覃文庆 +1 位作者 刘瑞增 王兴杰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第7期2388-2397,共10页
Interaction mechanism of the collector,2-mercaptobenzothiazole(MBT),with chalcopyrite and sphalerite surfaces were investigated by Fourier transform infrared(FTIR) and density functional theory,Results of FTIR sho... Interaction mechanism of the collector,2-mercaptobenzothiazole(MBT),with chalcopyrite and sphalerite surfaces were investigated by Fourier transform infrared(FTIR) and density functional theory,Results of FTIR showed that some characteristic peaks of MBT were observed on the chalcopyrite surface,including C=N,C=N-S and C-S stretching vibration peaks,and the adsorption product was CuMBT.But there were no characteristic peaks of MBT on the sphalerite surface.The thione molecular form of MBT was the most efficient and stable,N and exocyclic S were the more favourable reactive sites for nucleophilic attacked by metal atoms.Compared with ZnS(110),MBT is more readily adsorbed on CuFeS2(112).Attachment of MBT occurs due to strong bonding through exocyclic S p and s orbits with Cu d orbit on CuFeS2(112) and electron transfer from Cu atom to S atom.Under the vacuum condition,MBT in the form of thione molecular cannot be adsorbed on ZnS(110) spontaneously. 展开更多
关键词 CHALCOPYRITE SPHALERITE 2-MERCAPTOBENZOTHIAZOLE adsorption mechanism density functional theory
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电厂粉煤灰、炉渣和污泥复合陶粒对低浓度Pb^(2+)的吸附特性 被引量:3
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作者 杨毅 高敏轩 +3 位作者 陈元 赵睿 舒麒麟 刘伟 《环境科学研究》 CAS CSCD 北大核心 2024年第2期407-414,共8页
针对重金属污染具有来源广、危害大等特点,通过以电厂废物(粉煤灰、炉渣)和脱水污泥为原料制备一种高效且价廉的陶粒吸附剂,采用吸附影响因素实验、解吸再生实验、吸附动力学模型和等温吸附模型的拟合以及陶粒表征分析,探究陶粒对Pb^(2+... 针对重金属污染具有来源广、危害大等特点,通过以电厂废物(粉煤灰、炉渣)和脱水污泥为原料制备一种高效且价廉的陶粒吸附剂,采用吸附影响因素实验、解吸再生实验、吸附动力学模型和等温吸附模型的拟合以及陶粒表征分析,探究陶粒对Pb^(2+)的吸附特性,同时为实现废物资源化利用提供新思路.结果表明:陶粒去除Pb^(2+)的较佳吸附条件为粒径4 mm、pH 4.5~5.0、吸附时间360 min、吸附温度25℃.陶粒再生所用较佳解吸剂为0.5 mol/L的HCl溶液,较佳解吸时间和次数分别为120 min和5次,解吸5次后陶粒对Pb^(2+)的去除率为92.67%.此吸附过程更好地遵循了准二级动力学模型和Freundlich等温吸附模型.陶粒上的O-H、Si-O和金属氧化键在吸附Pb^(2+)的过程中起主要作用.陶粒吸附Pb^(2+)后,出现了新的物相Pb_(2)Cl_(3)OH和PbO,陶粒与Pb^(2+)之间发生化学吸附,为自发进行的放热反应.陶粒处理实际废水中Pb^(2+)的去除率可达93.70%,Pb^(2+)浓度由3.74 mg/L降至0.24 mg/L.研究显示,电厂粉煤灰、炉渣和污泥复合陶粒对Pb^(2+)具有一定的去除效果,可为以固体废物为原料制备的吸附剂在重金属废水处理应用中提供数据支撑. 展开更多
关键词 电厂废物 污泥 陶粒 Pb^(2+) 表征分析 吸附特性
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Adsorption of Cu^(2+) from aqueous solution by modified biomass material 被引量:3
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作者 董颖博 林海 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第3期991-996,共6页
Cu2+ adsorption from simulated aqueous solution was investigated using a modified spent shiitake substrate (MSSS). The results showed that the MSSS has a high adsorption efficiency and removal performance. The Cu2+rem... Cu2+ adsorption from simulated aqueous solution was investigated using a modified spent shiitake substrate (MSSS). The results showed that the MSSS has a high adsorption efficiency and removal performance. The Cu2+removal rate of the MSSS reached above 95%. Compared with spent shiitake substrate (SSS), the specific surface area, electronegativity and surface functional groups of the MSSS were all improved, resulting in a high adsorption capacity. The Cu2+ adsorption of MSSS reached equilibrium after 0.75 h and was an exothermic reaction. The SEM and EDS analyses of the MSSS before and after Cu2+ adsorption showed that the pores on the surface of the MSSS were occupied after adsorption and the Cu content increased but the Na content decreased. 展开更多
关键词 biomass material spent shiitake substrate modification adsorption heavy metal CU2+
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羧基化柚子皮吸附Cd^(2+)的性能与机制
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作者 陈尚龙 刘恩岐 +3 位作者 赵节昌 陈安徽 刘辉 苗敬芝 《材料导报》 EI CAS CSCD 北大核心 2024年第20期283-289,共7页
为探索利用食品加工废弃物柚子皮制备一种重金属离子吸附材料的可行性,通过NaOH将柚子皮中甲酯化的羧基水解成羧酸,再利用TEMPO/次氯酸钠/溴化钠体系将柚子皮中C-6位伯羟基氧化成羧酸,制备出一种羧基化柚子皮吸附材料,同时采用FTIR、SEM... 为探索利用食品加工废弃物柚子皮制备一种重金属离子吸附材料的可行性,通过NaOH将柚子皮中甲酯化的羧基水解成羧酸,再利用TEMPO/次氯酸钠/溴化钠体系将柚子皮中C-6位伯羟基氧化成羧酸,制备出一种羧基化柚子皮吸附材料,同时采用FTIR、SEM-EDS和XPS对柚子皮和吸附Cd^(2+)前后的羧基化柚子皮进行表征,研究其吸附机制。结果表明羧基化柚子皮中羧基含量为2.34 mmol/g,是改性前的10.64倍,且可以有效地去除水溶液中Cd^(2+)。羧基化柚子皮吸附Cd^(2+)更符合Langmuir和伪二阶动力学模型,属于单层化学吸附,对Cd^(2+)的最大吸附量为76.16 mg/g,是改性前的5.81倍。羧基化柚子皮中羧基(-COO^(-))是吸附Cd^(2+)的功能性基团,吸附后形成羧酸镉,其中镉以Cd^(2+)的形式存在,与-COO^(-)的配位方式主要是双齿桥式,该吸附过程是一个阳离子(Na^(+)和Cd^(2+))交换的过程。 展开更多
关键词 羧基 柚子皮 Cd^(2+) 吸附性能 吸附机制
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