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基于改进型吸附等温线模型的空气预纯化TSA双层床模拟 被引量:1
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作者 张培昆 王立 李正强 《化工学报》 EI CAS CSCD 北大核心 2010年第10期2604-2614,共11页
为了掌握空气中CO2和水蒸气在空分装置双层床变温吸附(TSA)纯化器中的动态吸附特性,通过LDF传质假设及非绝热假设,建立了一维二元稀组分系统的双层床TSA过程数学模型。一种改进型的多组分等温线模型用于描述水蒸气的Ⅱ型吸附等温线以及... 为了掌握空气中CO2和水蒸气在空分装置双层床变温吸附(TSA)纯化器中的动态吸附特性,通过LDF传质假设及非绝热假设,建立了一维二元稀组分系统的双层床TSA过程数学模型。一种改进型的多组分等温线模型用于描述水蒸气的Ⅱ型吸附等温线以及水蒸气和CO2混合物的吸附平衡关系。通过对比模拟结果与TSA纯化器的现场监控数据发现,基于改进型等温线模型的模拟结果与现场数据吻合良好。最后对多种工况下的TSA纯化器中的温度、浓度及吸附量床层分布和穿透曲线进行了数值模拟和分析。 展开更多
关键词 空气分离 吸附等温线模型 变温吸附 纯化器
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木质素基高效染料吸附材料制备及其性能研究
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作者 温默涵 徐新 +2 位作者 李丽君 黄剑波 张学铭 《中国造纸》 CAS 北大核心 2024年第7期74-83,共10页
本研究采用ZnCl2、KOH和尿素共同活化处理工业碱木质素,经高温碳化(700℃)制备得到木质素基高吸附性能材料(Zn-LB)。将Zn-LB用于亚甲基蓝和甲基橙染料溶液吸附实验,探究了染料种类、吸附温度、多元混合染料体系对Zn-LB吸附性能的影响。... 本研究采用ZnCl2、KOH和尿素共同活化处理工业碱木质素,经高温碳化(700℃)制备得到木质素基高吸附性能材料(Zn-LB)。将Zn-LB用于亚甲基蓝和甲基橙染料溶液吸附实验,探究了染料种类、吸附温度、多元混合染料体系对Zn-LB吸附性能的影响。结果表明,Zn-LB的比表面积高达2190.3 m^(2)/g。通过Langmuir吸附等温线模型拟合了Zn-LB对亚甲基蓝和甲基橙的最大平衡吸附量分别为1345.9和1732.4 mg/g。此外,Zn-LB对亚甲基蓝的吸附量随温度的升高而升高,表明吸附亚甲基蓝是一个吸热过程;而Zn-LB对甲基橙的吸附则相反,是一个放热过程。 展开更多
关键词 碱木质素 吸附 亚甲基蓝 甲基橙 吸附等温线模型
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硫代氨基功能化粉煤灰空心微珠@碳纳米管吸附Cu^(2+)研究 被引量:1
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作者 王柯 张晓民 +4 位作者 张良 刘佳倩 刘冰 王壮 马健翔 《化工矿物与加工》 CAS 2023年第9期6-13,共8页
碳纳米管作为一维纳米材料,具有高比表面积和结构可控等优点,被广泛应用于吸附领域,同时也因存在疏水性强、表面惰性以及选择性吸附能力差等不足而限制了其在重金属吸附领域的应用。以燃煤废料粉煤灰空心微珠为原料,制备了一种具有高缺... 碳纳米管作为一维纳米材料,具有高比表面积和结构可控等优点,被广泛应用于吸附领域,同时也因存在疏水性强、表面惰性以及选择性吸附能力差等不足而限制了其在重金属吸附领域的应用。以燃煤废料粉煤灰空心微珠为原料,制备了一种具有高缺陷密度的空心微珠@碳纳米管材料,并通过羧基化、酰氯化在其表面接枝了硫代氨基官能团,将其用于吸附水溶液中的Cu^(2+),结果表明:粉煤灰空心微珠@碳纳米管表面成功引入了羧基、羟基、氨基等官能团,表面Zeta电位降低;吸附容量与吸附过程中的反应温度、初始pH、初始质量浓度呈正相关;在120 min时吸附达到平衡,平衡时复合材料对Cu^(2+)的吸附容量为34.0 mg/g;吸附过程符合Freundlich吸附等温线模型,与准二级动力学模型拟合度高,吸附过程为自发的吸热反应;吸附机理包括离子交换、静电相互作用和表面络合作用。该研究成果可为粉煤灰的高值化利用和水溶液中Cu^(2+)的吸附研究提供参考。 展开更多
关键词 粉煤灰空心微珠 碳纳米管 功能化改性 氨基硫脲 Cu^(2+)吸附 Freundlich吸附等温线模型 吸附机理
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改性沸石对猪场沼液氮磷吸附特性与机理分析 被引量:19
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作者 张文艺 郑泽鑫 +1 位作者 韩有法 占明飞 《农业环境科学学报》 CAS CSCD 北大核心 2014年第9期1837-1842,共6页
针对猪场沼液氮磷含量高、有机污染严重、难以处理的问题,采用经氯化钠溶液改性沸石为载体对沼液中氮磷吸附特性和去除机理进行分析研究,考察了沸石投加量、吸附时间、沼液初始浓度等影响因素。结果表明:当沸石投加量为每100mL10g、吸... 针对猪场沼液氮磷含量高、有机污染严重、难以处理的问题,采用经氯化钠溶液改性沸石为载体对沼液中氮磷吸附特性和去除机理进行分析研究,考察了沸石投加量、吸附时间、沼液初始浓度等影响因素。结果表明:当沸石投加量为每100mL10g、吸附时间48 h时,最大氨氮去除率可达90.66%,氨氮饱和吸附量可达1.43 mg·g-1,最大总磷去除率可达85.97%,磷饱和吸附量可达0.16 mg·g-1。吸附后的沸石污泥含有大量氮磷元素,是一种优质缓释肥料。Freundlich、Langmuir方程均能较好地解析改性沸石的等温吸附过程,其吸附动力学符合准二级动力学模型,R2均达0.98以上。沸石对猪场沼液中有机态氮磷去除主要基于物理性吸附和沸石中的活性基团与有机官能团所产生的配位络合,无机态氮磷则主要以离子交换及吸附沉淀方式得以去除。 展开更多
关键词 改性沸石 猪场沼液 吸附等温线模型 准二级动力学模型
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大孔强酸树脂膨胀床吸附提取ε-聚赖氨酸的研究 被引量:1
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作者 刘洋 王靓 +2 位作者 张宏建 陈旭升 张建华 《食品与发酵工业》 CAS CSCD 北大核心 2022年第22期9-17,共9页
为了取消ε-聚赖氨酸(ε-poly-L-lysine,ε-PL)提取工艺中的固液分离操作,降低分离提取成本和提高提取效率,该研究建立了一种利用膨胀床直接从发酵液中吸附提取ε-PL的新工艺。首先通过静态吸附进行大孔强酸树脂筛选,再采用两种等温线... 为了取消ε-聚赖氨酸(ε-poly-L-lysine,ε-PL)提取工艺中的固液分离操作,降低分离提取成本和提高提取效率,该研究建立了一种利用膨胀床直接从发酵液中吸附提取ε-PL的新工艺。首先通过静态吸附进行大孔强酸树脂筛选,再采用两种等温线模型研究293~310 K下树脂吸附ε-PL热力学行为,再对膨胀床吸附提取ε-PL的工艺参数进行优化,最后构建并优化了三柱串联膨胀床吸附提取ε-PL循环工艺条件。结果表明,大孔强酸钠型树脂SQD-04适用于膨胀床工艺,且其吸附ε-PL符合Langmuir吸附等温线模型,热力学参数分析发现SQD-04树脂吸附ε-PL过程为放热反应;在三柱串联膨胀床循环工艺中,初始进料质量浓度25 g/L,树脂初始高径比2.7,膨胀比1.6,v_(1)=1 BV/h时进料,13个柱体积时3#柱穿透,1#柱的树脂饱和度可达0.76,总收率为98.20%。研究结果为利用膨胀床直接从发酵液中吸附提取ε-PL工艺的工业应用提供了重要指导,也为升级换代现有ε-PL提取工艺提供了新思路。 展开更多
关键词 Ε-聚赖氨酸 膨胀床 离子交换 吸附等温线模型 热力学
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NaHCO3处理胶乳生产污泥制备吸附剂对阳离子染料的吸附 被引量:1
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作者 夏晶晶 张克瑞 +3 位作者 蔡豆豆 张宾 潘颖 柳荣展 《化工进展》 EI CAS CSCD 北大核心 2019年第6期3002-3009,共8页
以胶乳生产厂脱水污泥为原料、1.40mol/L的NaHCO3作膨胀剂,60℃浸渍并超声处理30min,污泥烘干后再经高温炭化制备吸附剂,将其用于吸附阳离子兰X-GRRL染料溶液,考察炭化温度、炭化时间、吸附剂粒径、吸附剂投加量、吸附时间及溶液pH对吸... 以胶乳生产厂脱水污泥为原料、1.40mol/L的NaHCO3作膨胀剂,60℃浸渍并超声处理30min,污泥烘干后再经高温炭化制备吸附剂,将其用于吸附阳离子兰X-GRRL染料溶液,考察炭化温度、炭化时间、吸附剂粒径、吸附剂投加量、吸附时间及溶液pH对吸附效果的影响,并对其吸附动力学和吸附等温线类型进行了探讨。结果表明:污泥在炭化温度700℃、炭化时间120min的条件下,制备的吸附剂(粒径<0.75mm)的比表面积为118.95m^2/g,孔隙结构较为发达,对染料溶液吸附效果最佳;在振荡频率150r/min、吸附温度为25℃±0.10℃、初始染料质量浓度为250mg/L、吸附剂投加量为1.20g/L、溶液pH为5.47、吸附时间为300min时,溶液脱色率可达98.30%,染料吸附量为204.80mg/g;其吸附动力学可用准二级动力学方程进行描述;符合Langmuir型吸附等温线,属于单分子层吸附;吸附剂浸出液及吸附处理后的染料溶液的COD值分别为4.00mg/L和20.00mg/L,不会对水体造成二次污染。 展开更多
关键词 胶乳生产污泥 吸附 膨胀剂 动力学 吸附等温线模型
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空气预纯化吸附过程模拟 被引量:1
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作者 程烦 王煤 《低温与特气》 CAS 2013年第3期19-24,共6页
采用一种改进型的多组分等温线模型,运用Aspen Adsorption软件模拟空分过程中吸附塔内13X分子筛吸附空气中微量水蒸气和二氧化碳的过程。考察了操作压力、温度变化对穿透时间的影响以及水蒸气、二氧化碳在床层中的负载分布。研究结果表... 采用一种改进型的多组分等温线模型,运用Aspen Adsorption软件模拟空分过程中吸附塔内13X分子筛吸附空气中微量水蒸气和二氧化碳的过程。考察了操作压力、温度变化对穿透时间的影响以及水蒸气、二氧化碳在床层中的负载分布。研究结果表明:当压力从120 kPa增大到350 kPa,H2O和CO2的穿透时间分别增加32%和116%;在10~30℃,随着温度的升高,穿透时间点逐渐前移,但变化幅度较小;在CO2和H2O的竞争吸附中,CO2吸附能力明显弱于H2O,其饱和吸附量仅为H2O饱和吸附量的0.34%。 展开更多
关键词 吸附 ASPEN ADSORPTION 吸附等温线模型 水蒸气 二氧化碳
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粒状载银活性炭微结构及对有机物的吸附性 被引量:1
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作者 杨靖 艾煜智 +2 位作者 王雄铎 赵亚梅 郭亚妮 《西安工程大学学报》 CAS 2019年第4期401-407,共7页
为了探讨载银对活性炭吸附有机物性能的影响,采用硼氢化钠还原法制备粒状载银活性炭。通过X射线衍射、扫描电子显微镜、红外光谱以及比表面积测定等方法对载银活性炭的微结构进行分析表征,考察AgNO3浓度对粒状活性炭微结构和有机物吸附... 为了探讨载银对活性炭吸附有机物性能的影响,采用硼氢化钠还原法制备粒状载银活性炭。通过X射线衍射、扫描电子显微镜、红外光谱以及比表面积测定等方法对载银活性炭的微结构进行分析表征,考察AgNO3浓度对粒状活性炭微结构和有机物吸附性能的影响,同时研究载银活性炭吸附有机物的动力学特性。结果表明,银以单质形式负载在活性炭上,活性炭的比表面积、银颗粒的粒径及分布与AgNO3溶液浓度密切相关。红外光谱证实载银活性炭表面有羰基、羧基、羟基等氧化性基团存在。载银活性炭对苯酚等4种有机物的吸附去除率比普通活性炭增大了约10%,这些吸附属于优惠吸附,可以很好地用Freundlich吸附等温线模型来描述其吸附平衡过程。载银活性炭具有较普通活性炭更大的有机物吸附性能。 展开更多
关键词 硼氢化钠还原法 粒状载银活性炭 有机物吸附 微结构 Freundlich吸附等温线模型
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树枝状疏水缔合聚合物的吸附行为 被引量:2
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作者 朱诗杰 叶仲斌 +3 位作者 宋瑞 何东 高源 李俊 《精细石油化工》 CAS 2021年第3期12-17,共6页
以部分水解聚丙烯酰胺(HPAM)为对比,研究了溶液浓度、接触时间、石英砂颗粒粒径对树枝状聚合物DHAP溶液吸附量的影响。结果表明:HPAM符合Langmuir等温线吸附和准二级吸附动力学,在石英砂表面进行化学吸附,具有稳定的单分子层吸附特征,... 以部分水解聚丙烯酰胺(HPAM)为对比,研究了溶液浓度、接触时间、石英砂颗粒粒径对树枝状聚合物DHAP溶液吸附量的影响。结果表明:HPAM符合Langmuir等温线吸附和准二级吸附动力学,在石英砂表面进行化学吸附,具有稳定的单分子层吸附特征,单位面积的平衡吸附量为1.17~1.62μg/cm^(2);树枝状聚合物DHAP符合Langmuir等温线吸附、准二级吸附动力学和Elovich模型,在石英砂上的单位面积吸附量为6.44~8.45μg/cm^(2)。树枝状聚合物DHAP的吸附机理包括以氢键、静电作用等在石英砂表面所产生的一级化学吸附、分子间缔合作用影响下的二级缠绕、树枝状结构的空间展布扩宽吸附层厚度。 展开更多
关键词 树枝状聚合物 吸附机理 等温线吸附模型 吸附动力学模型
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Adsorptive Thermodynamic Properties and Kinetics of trans-1,2-Cyclohexandiol onto AB-8 Resin 被引量:1
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作者 谢艳新 侯丽丽 +1 位作者 杨倩 蒋登高 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第2期277-283,共7页
AB-8 resin was used as an adsorbent for the removal of trans-1,2-cyclohexandiol(CHD) from aqueous solutions.Batch experiments were carried out to investigate the effect of contact time and temperature on sorption effi... AB-8 resin was used as an adsorbent for the removal of trans-1,2-cyclohexandiol(CHD) from aqueous solutions.Batch experiments were carried out to investigate the effect of contact time and temperature on sorption efficiency.The adsorptive thermodynamic properties and kinetics of CHD from water onto AB-8 resin were studied.The Langmuir and Freundlich isotherm models were employed to discuss the adsorption behavior.Thermodynamic parameters such as G,H and S were calculated.The results indicate that the equilibrium data are perfectly represented by Langmuir isotherm model.Thermodynamic study reveals that it is an exothermic process in nature and mainly physical adsorption enhanced by chemisorption with a decrease of entropy process.The kinetics of CHD adsorption is well described by the pseudo second-order model.The adsorbed CHD can be eluted from AB-8 resin by 5% ethanol aqueous solution with 100% elution percentage. 展开更多
关键词 AB-8 resin trans-1 2-cyclohexandiol ADSORPTION ISOTHERM THERMODYNAMICS KINETICS
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Error Analysis of Adsorption Isotherm Models for Acid Dyes onto Bamboo Derived Activated Carbon 被引量:2
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作者 L.S.Chan W.H.Cheung +1 位作者 S.J.Allen G.McKay 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第3期535-542,共8页
High surface area activated carbons were produced by thermal activation of waste bamboo scaffolding with phosphoric acid.Single component equilibrium dye adsorption was conducted on the carbons produced and compared w... High surface area activated carbons were produced by thermal activation of waste bamboo scaffolding with phosphoric acid.Single component equilibrium dye adsorption was conducted on the carbons produced and compared with a commercially available carbon.Two acid dyes with different molecular sizes,namely Acid Yellow 117(AY117) and Acid Blue 25(AB25),were used to evaluate the adsorption capacity of the produced carbons.It was found that the dye with smaller molecular size,AB 25,was readily adsorbed onto the produced carbon,nearly three times higher than a commercially available carbon,while the larger size dye,AY117,showed little adsorption.The experimental data were analyzed using isotherm equations including Langmuir,Freundlich,Tempkin,Toth,Redlich-Peterson and Sips equations.The equilibrium data were then analyzed using five different non-linear error analysis methods. 展开更多
关键词 ADSORPTION activated carbon acid dye equilibrium isotherm error analysis BAMBOO
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Monte Carlo simulation of methane molecule adsorption on coal with adsorption potential 被引量:5
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作者 Li Xijian Lin Baiquan Xu Hao 《International Journal of Mining Science and Technology》 SCIE EI 2014年第1期17-22,共6页
The paper presents a Monte Carlo simulation to study the adsorption characteristics of methane molecule on coal slit pores from different aspects.Firstly,a physical model of adsorption and desorption of methane molecu... The paper presents a Monte Carlo simulation to study the adsorption characteristics of methane molecule on coal slit pores from different aspects.Firstly,a physical model of adsorption and desorption of methane molecules on micropores was established.Secondly,a grand canonical ensemble was introduced as the Monte Carlo simulation system.Thirdly,based on the model and system,the molecule simulation program was developed with VC++6.0 to simulate the isothermal adsorption relationship between the amount of molecule absorption and the factors affecting it.Lastly,the numerically simulated results were compared with measured results of adsorption coal samples of two different coal mines with a laboratory gas absorption instrument.The results show that the molecule simulations of the adsorption constants,the adsorption quantity,and the isothermal adsorption curve at the same and different coal temperatures were in good agreement with those measured in the experiments,indicating that it is feasible to use the established model and the Monte Carlo molecule simulation to study the adsorption characteristics of methane molecules in coal. 展开更多
关键词 Methane Adsorption Molecular simulation Slit pore Isothermal adsorption curve
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Adsorption of 2,4-Dichlorophenol from Aqueous Solution onto Microwave Modified Activated Carbon: Kinetics and Equilibrium 被引量:1
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作者 邹学权 万先凯 +1 位作者 史惠祥 汪大翚 《Transactions of Tianjin University》 EI CAS 2009年第6期408-414,共7页
Batch experiments were conducted to investigate the adsorption of 2,4-dichlorophenol (2,4-DCP) onto microwave modified activated carbon (AC) at three different temperatures (303 K, 313 K and 323 K). Adsorption i... Batch experiments were conducted to investigate the adsorption of 2,4-dichlorophenol (2,4-DCP) onto microwave modified activated carbon (AC) at three different temperatures (303 K, 313 K and 323 K). Adsorption isotherms, kinetics, and thermodynamics of the adsorption process were explored. Equilibrium data were fitted into Langmuir and Freundlich equations, and the result reveals that the Freundlich isotherm model fits better than the Langmuir model. Three simplified kinetic models: pseudo-first-order, pseudo-second-order, and intrapartiele diffusion equations were adopted to examine the mechanism of the adsorption process, and the pseudo-second-order kinetic model proved to be the best in describing the adsorption data. The thermodynamic parameters of the adsorption process were estimated, showing that the adsorption of 2,4-DCP was exothermic and spontaneous, and the adsorption studied in this paper can be assigned to a physisorption mechanism. 展开更多
关键词 activated carbon ADSORPTION MICROWAVE KINETICS 2 4-DCP
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Kinetic Modeling of Isothermal or Non-isothermal Adsorption in a Pellet:Application to Adsorption Heat Pumps 被引量:1
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作者 Ludovic Montastruc Pascal Floquet +2 位作者 Volker Mayer Iordan Nikov Serge Domenech 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第4期544-553,共10页
Understanding the interaction between a fluid and a solid phase is of fundamental importance to the design of an adsorption process.Because the heat effects associated with adsorption are comparatively large,the as-su... Understanding the interaction between a fluid and a solid phase is of fundamental importance to the design of an adsorption process.Because the heat effects associated with adsorption are comparatively large,the as-sumption of isothermal behavior is a valid approximation only when uptake rates are relatively slow.In this article,we propose to determine when it is needed to choose the isothermal or non-isothermal assumption according to two physical parametersα(ratio convection/capacity) andβ(quantity of energy/capacity) .The proposed problem is solved by a mathematical method in the Laplace domain.Whenα→∞(infinitely high heat transfer coefficient) or β→0(infinitely large heat capacity) ,the limiting case is isothermal.When the diffusion is rapid(α10) the kinetics of sorption is controlled entirely by heat transfer.If the adsorption process is to be used as a heat pump,it shall be represented by an isotherm model withαandβas high as possible. 展开更多
关键词 ADSORPTION NON-ISOTHERMAL ENERGY PELLET
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Strontium Adsorption from Sulfuric Acid Solution by Dowex 50W-X Resins 被引量:4
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作者 Meisam Hafizi Hossein Abolghasemi +1 位作者 Morteza Moradi Saeed Alamdar Milani 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第2期267-272,共6页
In this study,strontium adsorption from sulfuric acid solution by different Dowex 50W-X ion exchange resins was investigated.Among these resins,Dowex 50W-X8 resin showed the maximum sorption of strontium from the aque... In this study,strontium adsorption from sulfuric acid solution by different Dowex 50W-X ion exchange resins was investigated.Among these resins,Dowex 50W-X8 resin showed the maximum sorption of strontium from the aqueous solutions.The effect of pH,contact time,mass of resin,temperature,and concentration of interfering ions on strontium adsorption were evaluated to determine the optimum conditions of strontium sorption process.The kinetic models of sorption were analyzed using pseudo-first and pseudo-second order models.The results indicated that the pseudo-second order kinetic model was more appropriate than the other one.Moreover,the data obtained in this study were fitted into several sorption isotherm models and it was found that the Langmuir sorption isotherm shows the best fitting to the experimental data. 展开更多
关键词 strontium adsorption ion exchange Dowex 50W kinetic model RESIN sorption isotherm model
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Adsorption equilibrium for Z-ligustilide on C18-bonded silica from supercritical carbon dioxide 被引量:1
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作者 Huisheng Lü Shuangyan Liu +3 位作者 Yonghui Li Fanmei Meng Dawei Yao Xufei Mo 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第12期1680-1686,共7页
Adsorption equilibrium is of great importance for the preparative supercritical fluid chromatography(pre-SFC) in defining supercritical adsorption behavior and the industrial amplification.This paper presents adsorpti... Adsorption equilibrium is of great importance for the preparative supercritical fluid chromatography(pre-SFC) in defining supercritical adsorption behavior and the industrial amplification.This paper presents adsorption isotherms of Z-ligustilide from supercritical carbon dioxide(SC-CO_2) on C18-bonded silica.Adsorption behavior was studied at 305.15 K,313.15 K and 323.15 K with SC-CO_2 density varying from 0.687 g·cm^(-3) to0.863 g·cm^(-3) with the elution by characteristic points(ECP) method.The adsorption amount of Z-ligustilide from SC-CO_2 on C18-bonded silica decreased with the increasing density of the mobile phase as well as the increasing temperature.Adsorption equilibrium data were fitted by Langmuir and Freundlich isotherm models,and the Langmuir isotherm model performed better for describing the whole adsorption process on the column.The monolayer saturation adsorption capacity of Z-ligustilide is in the range of 3.0 × 10^(-4) mg·cm^(-3) to5.5 × 10^(-4) mg·cm^(-3) with an average value of 4.0 × 10^(-4) mg·cm^(-3). 展开更多
关键词 Z-ligustilide C18-bonded silica Pre-SFC Adsorption equilibrium Isotherm model
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Removal of Bi(Ⅲ) with Adsorption Technique Using Coconut Shell Activated Carbon 被引量:3
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作者 SARTAPE Ashish MANDHARE Aniruddha +4 位作者 SALVI Prathmesh PAWAR Dattatraya RAUT Prakash ANUSE Mansing KOLEKAR Sanjay 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第4期768-775,共8页
In present study,we report the preparation of coconut shell activated carbon as adsorbent and its appli-cation for Bi(Ⅲ) removal from aqueous solutions.The developed adsorbent was characterized with scanning elec-tro... In present study,we report the preparation of coconut shell activated carbon as adsorbent and its appli-cation for Bi(Ⅲ) removal from aqueous solutions.The developed adsorbent was characterized with scanning elec-tron microscope(SEM),Fourier Transform Infrared(FTIR),C,H,N,S analyzer,and BET surface area analyzer.The parameters examined include agitation time,initial concentration of Bi(Ⅲ),adsorbent dose and temperature.The maximum adsorption of Bi(Ⅲ)(98.72%) was observed at 250 mg·L-1 of Bi(Ⅲ) and adsorbent dose of 0.7 g when agitation was at 160 r·min-1 for 240 min at(299±2) K.The thermodynamic parameters such as Gibb's free energy(△Gθ),enthalpy(△Hθ) and entropy(△Sθ) were evaluated.For the isotherm models applied to adsorption study,the Langmuir isotherm model fits better than the Freundlich isotherm.The maximum adsorption capacity from the Langmuir isotherm was 54.35 mg?g?1 of Bi(Ⅲ).The kinetic study of the adsorption shows that the pseudo second order model is more appropriate than the pseudo first order model.The result shows that,coconut shell ac-tivated carbon is an effective adsorbent to remove Bi(Ⅲ) from aqueous solutions with good adsorption capacity. 展开更多
关键词 ABSORPTION bismuth(Ⅲ) coconut shell activated carbon ISOTHERM
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Comparative Study of the Adsorption Thermodynamic Parameters Estimated through Different Approaches
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作者 Manuela Gomes Cardoso Odivan Zanella Leandro Marques Paim Isabel Cristina Tessaro Liliana Amaral Feris 《Journal of Chemistry and Chemical Engineering》 2014年第8期757-766,共10页
The equilibrium constant (K0), change in free energy (△G), enthalpy (△H) and entropy (△S) of ammonium adsorption by a Cuban natural zeolite were estimated at the temperatures of 25, 35, 45 and 55℃ using ex... The equilibrium constant (K0), change in free energy (△G), enthalpy (△H) and entropy (△S) of ammonium adsorption by a Cuban natural zeolite were estimated at the temperatures of 25, 35, 45 and 55℃ using extensively used approaches. Equilibrium data were obtained in the concentration range 50-1,200 mg·L-1 of ammonium and used in the estimation of thermodynamic parameters. Freundlich's isotherm model was found as with the best adjustment to equilibrium data at 25, 45 and 55℃, whereas, Redlich-Peterson's model had a better performance at 35 ℃. A discontinuous and unusual behavior was observed on adsorption capacity of the zeolite, with an increase from 25 ℃ to 35 ℃ followed by a decrease from 35℃ to 55 ℃. K0 values presented differences that reached up to 105 from one methodology to other. Depending on the method considered, AS results indicated both increase or decrease in system degree of disorder and △G indicated both physisorption or chemisorption process, proving the poor correlation between the estimation proceedings of such important data. The results from Gaines and Thomas method were recognized as the most correlated to calorimetric studies, as well as to equilibrium data and observations related to system entropy. 展开更多
关键词 ADSORPTION THERMODYNAMIC ZEOLITE ammonium.
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A Modified Peng-Robinson Equation State for Prediction of Gas Adsorption Isotherm 被引量:2
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作者 Ali Akbar Amooey 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第6期628-633,共6页
This research proposes a modified two-dimensional Peng-Robinson equation model to predict adsorption isotherm in adsorbate-adsorbent systems. The parameters of the proposed model are calculated by using the optimizati... This research proposes a modified two-dimensional Peng-Robinson equation model to predict adsorption isotherm in adsorbate-adsorbent systems. The parameters of the proposed model are calculated by using the optimization of experimental data for the different single gas adsorption systems at various temperatures. The experimental adsorption equilibrium data of adsorbate-adsorbent systems was compared with the calculated results in our proposed model and the two-dimensional Hill-deBoer equation model. The proposed model as indicated in the results shows a better prediction of the experimental results compared with two others. 展开更多
关键词 gas adsorption isotherm Peng-Robinson equation state
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Chemisorption and Physical Adsorption Roles in Cadmium Biosorption by Chlamydomonas Reinhardtii
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作者 Jiang Yongbin Huo Xiangyuan +1 位作者 Zhu Yi Ji Hongbing 《Chinese Journal of Population,Resources and Environment》 2010年第3期54-58,共5页
The aim of this study was to investigate the mechanism of cadmium (Cd) adsorbed by microalgae Chlamydomonas reinhardtii (C.reinhardtii). The kinetic and adsorption isotherm of the process could be well described by ma... The aim of this study was to investigate the mechanism of cadmium (Cd) adsorbed by microalgae Chlamydomonas reinhardtii (C.reinhardtii). The kinetic and adsorption isotherm of the process could be well described by mathematical models. Chemical modification experiments and Fourier transform infrared spectra indicated that carboxyl and amine groups were the important functional groups for adsorption of Cd. The maximum contribution of physical adsorption in the overall adsorption process was evaluated as 5.5%. These results indicated that chemisorption was the dominating mechanism of Cd biosorption by C.reinhardtii. 展开更多
关键词 C.reinhardtii BIOSORPTION CHEMISORPTION physical adsorption
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