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Effects of ion-exchange on the pervaporation performance and microstructure of NaY zeolite membrane 被引量:1
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作者 Meihua Zhu Xingguo An +3 位作者 Tian Gui Ting Wu Yuqin Li xiangshu chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第7期176-181,共6页
Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt.Different nitrate salts,including Co(NO_(3))_(2),Mg(NO_(3))_(2),Zn(NO_(3))_(2),Ca(NO_(3))_(2),Cu(NO_(3))_(2),K... Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt.Different nitrate salts,including Co(NO_(3))_(2),Mg(NO_(3))_(2),Zn(NO_(3))_(2),Ca(NO_(3))_(2),Cu(NO_(3))_(2),KNO_(3),and AgNO_(3),have great effects on the channel structure and water affinity of the NaY zeolite membrane.When the concentration of nitrate salt,ion-exchange temperature and time are 0.1 mol·L^(-1),50℃and 2 h,the ion-exchange degree order of NaY zeolites is Ag^(+)>K^(+)>Ca^(2+)>Zn^(2+)>>Co^(2+)>Mg^(2+).Especially,Ag^(+)and K^(+)cation exchange degree of NaY zeolites are achieved to 96.54% and 82.77% in this work.BET surface,total pore capacity,pore size distribution and water contact angle of the ion-exchanged NaY zeolites are all disordered by mono-and di-valent cations.Di-valent nitrate salt is favor for increasing the dehydration performance of NaY zeolite membranes by ion-exchange.When the ion-exchange solution is Zn(NO_(3))_(2),the total flux variation and separation factor variation of the NaY membrane(M-5)are -45% and 230% for separation of 10%(mass)H_(2)O/EtOH mixture by pervaporation,and the ion-exchanged membranes showed good reproducibility. 展开更多
关键词 NaY zeolite membrane Ion-exchange PERVAPORATION
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Visible light-responsive carbon-decorated p-type semiconductor CaFe_2O_4 nanorod photocatalyst for efficient remediation of organic pollutants 被引量:4
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作者 Xin Liu Yuhong Zhang +4 位作者 Yushuai Jia Junzhe Jiang Yabin Wang xiangshu chen Tian Gui 《Chinese Journal of Catalysis》 EI CSCD 北大核心 2017年第10期1770-1779,共10页
We report the fabrication and photocatalytic property of a composite of C/CaFe2O4nanorods(NRs)in an effort to reveal the influence of carbon modification.It is demonstrated that the photocatalytic degradation activity... We report the fabrication and photocatalytic property of a composite of C/CaFe2O4nanorods(NRs)in an effort to reveal the influence of carbon modification.It is demonstrated that the photocatalytic degradation activity is dependent on the mass ratio of C to CaFe2O4.The optimal carbon content is determined to be58wt%to yield a methylene blue(MB)degradation rate of0.0058min.1,which is4.8times higher than that of the pristine CaFe2O4NRs.The decoration of carbon on the surface of CaFe2O4NRs improves its adsorption capacity of the MB dye,which is specifically adsorbed on the surface as a monolayer according to the adsorption isotherm analysis.The trapping experiments of the reactive species indicate that superoxide radicals(.O2)are the main active species responsible for the removal of MB under visible‐light irradiation.Overall,the unique feature of carbon coating enables the efficient separation and transfer of photogenerated electrons and holes,strengthens the adsorption capacity of MB,and improves the light harvesting capability,hence enhancing the overall photocatalytic degradation of MB. 展开更多
关键词 p‐type semiconductor CaFe2O4 Carbon coating Nanorod Composite photocatalyst Degradation of methylene blue
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p-Type CaFe_2O_4 semiconductor nanorods controllably synthesized by molten salt method 被引量:1
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作者 Xin Liu Junzhe Jiang +4 位作者 Yushuai Jia Ailing Jin xiangshu chen Fei Zhang Hongxian Han 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第3期381-386,共6页
Pure phase, regular shape and well crystallized nanorods of p-type semiconductor CaFeOhave been fabricated for the first time by a facile molten salt assisted method, as confirmed by XRD, TEM, SEM and HRTEM. UV-vis di... Pure phase, regular shape and well crystallized nanorods of p-type semiconductor CaFeOhave been fabricated for the first time by a facile molten salt assisted method, as confirmed by XRD, TEM, SEM and HRTEM. UV-vis diffuse reflectance spectra and Mott–Schottky plots show that the band structure of the CaFeOnanorods is narrower than that of the CaFeOnanoparticles synthesized by conventional method. The enhancement of the visible-light absorption is due to narrowness of the band gap in CaFeOnanorods. The appropriate ratio between the molten salt and the CaFeOprecursors plays an important role in inhibiting the growth of the crystals along the(201) plane to give the desired nanorod morphology. This work not only demonstrates that highly pure p-type CaFeOsemiconductor with tunable band structure and morphology could be obtained using the molten salt strategy, but also affirms that the bandgap of a semiconductor may be tunable by monitoring the growth of a particular crystal plane.Furthermore, the facile eutectic molten salt method developed in this work may be further extended to fabricate some other semiconductor nanomaterials with a diversity of morphologies. 展开更多
关键词 p-Type semiconductor CaFe_2O_4 nanorods Molten salt Crystal plane Visible-light absorption
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Growth process and short chain alcohol separation performance of fluoride-containing NaY zeolite membrane 被引量:1
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作者 Xiaopan chen Meihua Zhu +7 位作者 Sitong Xiang Tian Gui TingWu Yuqin Li NaHu Izumi Kumakiri xiangshu chen Hidetoshi Kita 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第1期154-159,共6页
Growth process of the NaY zeolite membranes was investigated by fluoride-containing precursor synthesis gel.Compared with the fluoride-free precursor synthesis gel,the irregular NaY zeolite crystals were dissolved int... Growth process of the NaY zeolite membranes was investigated by fluoride-containing precursor synthesis gel.Compared with the fluoride-free precursor synthesis gel,the irregular NaY zeolite crystals were dissolved into amorphous by the fluoride-containing precursor synthesis gel initially,the amorphous contained the Y-type zeolite characteristic bands by the IR characterization.The fine square NaY zeolite crystals arose from the amorphous,which were accumulated and gradually grew into a dense NaY zeolite layer on the support surface after 6.5 h.Because the excessive NaY zeolites were dissolved by the strong alkaline and fluoride-containing precursor synthesis gel,there was plenty of amorphous on NaY zeolites layer for prolonging the crystallization time.The assynthesized NaY zeolite membranes had a good separation performance and repeatability for separation of 10 wt%methanol(MeOH)/methyl methacrylate(MMA) mixture by pervaporation,the flux and separation factor were(1.27 ± 0.07) kg·M^(-2)·h^(-1) and(4900 ± 1500) at 323 K,respectively.Besides,the NaY zeolite membranes were applied to separate the other short chain alcohol from the various alcohol/organic ester and alcohol/organic ether mixtures,the NaY zeolite membranes showed high short chain alcohol perm-selectivity. 展开更多
关键词 NaY zeolite membrane Growth process Fluoride-containing Short chain alcohols PERVAPORATION
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Pervaporation performance and characterization of hydrophilic ZSM-5 zeolite membranes for high inorganic acid and inorganic salts
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作者 Huanxu Teng Ronghui You +7 位作者 Huanyi Li Siqi Shao Qi Zhou Ying Yang Ting Wu Meihua Zhu xiangshu chen Hidetoshi Kita 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2024年第9期27-33,共7页
The hydrophilic ZSM-5 zeolite membranes are applied to separate the inorganic acid solutions and inorganic acid/inorganic salt mixtures by pervaporation,and the membrane presents good stability,dehydration,and desalin... The hydrophilic ZSM-5 zeolite membranes are applied to separate the inorganic acid solutions and inorganic acid/inorganic salt mixtures by pervaporation,and the membrane presents good stability,dehydration,and desalination performance.Influences of inorganic acid type(H_(2)SO_(4),H_(3)PO_(4),HNO_(3),and HCl),H_(2)SO_(4)concentration(1-6 mol·L^(-1)),test temperature(60-90℃)and inorganic acid/inorganic salt type(2 mol·L^(-1)H_(2)SO_(4)and sulfate,2 mol·L^(-1)H3PO4 and phosphate)on the pervaporation performance are investigated in this work.Either for concentrating 3%(mass)H_(2)SO_(4)solution or consecutive dehydrating 20%(mass)H_(2)SO_(4)solution,the hydrophilic ZSM-5 zeolite membrane has a good dehydration performance and stability.Even though the H_(2)SO_(4)concentration and test temperature are increased to 6 M and 90℃,only H_(2)O molecules could pass through the membrane and pH value of the permeation is kept neutral.Besides,the membrane has good dehydration and desalination performance for H_(2)SO_(4)/sulfates and H_(3)PO_(4)/phosphate mixtures,and the rejection of natrium salt,molysite,and magnesium is almost 100%. 展开更多
关键词 Hydrophilic ZSM-5 zeolite membranes Inorganic acid Inorganic salt pervaporation Desalination
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细菌抗菌肽耐药机制研究进展 被引量:7
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作者 王雨霏 陈相书 张凌琳 《微生物学报》 CAS CSCD 北大核心 2019年第8期1419-1428,共10页
细菌对传统抗生素的耐药程度十分严重,寻找克服耐药性的新型抗菌药物已成为当务之急。抗菌肽(antimicrobial peptides,AMPs)是当下较有前景的抗菌药物之一。虽然通常认为,AMPs优先攻击细胞膜的特点使其不会引起广泛的耐药性,但其对特定... 细菌对传统抗生素的耐药程度十分严重,寻找克服耐药性的新型抗菌药物已成为当务之急。抗菌肽(antimicrobial peptides,AMPs)是当下较有前景的抗菌药物之一。虽然通常认为,AMPs优先攻击细胞膜的特点使其不会引起广泛的耐药性,但其对特定靶标的识别能力仍为基因突变和细菌耐药性的产生提供了可能。此外,一些细菌还显示出了抵御宿主AMPs的杀伤作用并与宿主细胞共存的能力,相应的细菌防御机制也使其对治疗性AMPs产生抗性,这种交叉抗性近年来也备受关注。这些耐药现象的发现均对AMPs的开发提出了新挑战。本综述就细菌对AMPs耐药的分子机制进行了研究进展的总结,并且对治疗性AMPs与宿主防御肽交叉抗性的相关机制研究进行了归纳,以期寻求新的对抗耐药性的策略。 展开更多
关键词 交叉耐药性 宿主防御肽 细胞膜 荚膜 磷壁酸 脂多糖
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Facile synthesis of graphene-supported Ni-CeOx nano-composites as highly efficient catalysts for hydrolytic dehydrogenation of ammonia borane 被引量:14
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作者 Qilu Yao Zhang-Hui Lu +3 位作者 Yuwen Yang Yuzhen chen xiangshu chen Hai-Long Jiang 《Nano Research》 SCIE EI CAS CSCD 2018年第8期4412-4422,共11页
Development of low-cost and high-performance catalysts for hydrogen generation via hydrolysis of ammonia borane (NH3BH3, AB) is a highly desirable pathway for future hydrogen utilization. In this work, Ni nanocataly... Development of low-cost and high-performance catalysts for hydrogen generation via hydrolysis of ammonia borane (NH3BH3, AB) is a highly desirable pathway for future hydrogen utilization. In this work, Ni nanocatalysts doped with CeOx and supported on graphene (Ni-CeOdgraphene) were synthesized via a facile chemical reduction route and applied as robust catalysts for the hydrolysis of AB in aqueous solution at room temperature. The as-synthesized Ni-CeOdgraphene nanocomposites (NCs) exhibited excellent catalytic activity with a turnover frequency (TOF) as high as 68.2 min-1, which is 49-fold higher than that for a simple Ni nanoparticle catalyst and is among the highest values reported for non-noble metal catalysts in AB hydrolysis. The development of efficient and low-cost Ni-CeOdgraphene catalysts enhances the feasibility of using ammonia borane as a chemical hydrogen storage material, which may find application in a hydrogen fuel-cell based economy. 展开更多
关键词 hydrogen generation ammonia borane CATALYSIS GRAPHENE nickel
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丙烯腈尾气协同脱除多段组合催化动力学研究及CFD模拟
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作者 陈祥树 魏莹 +1 位作者 王子春 张润铎 《中国科学:化学》 CAS CSCD 北大核心 2019年第8期1125-1134,共10页
本文通过筛选出几种适用于不同气体脱除的最佳催化剂及明确催化剂最优组合顺序,采用固定床微型反应器进行丙烯腈尾气催化燃烧试验考察,获得本征动力学数据,并对动力学数据的可靠性进行计算验证;采用CFD数值模拟软件建立多孔介质二维数... 本文通过筛选出几种适用于不同气体脱除的最佳催化剂及明确催化剂最优组合顺序,采用固定床微型反应器进行丙烯腈尾气催化燃烧试验考察,获得本征动力学数据,并对动力学数据的可靠性进行计算验证;采用CFD数值模拟软件建立多孔介质二维数学模型,在实际工业废气条件下,对废气组分催化燃烧反应进行模拟,分析操作参数对废气催化燃烧特性的影响.通过模拟获得丙烯腈尾气脱除的最佳操作条件(流速:<30000 h-1,入口温度:>623 K,组分摩尔比:>10:1,催化剂床层孔隙率:~0.7);在该最佳操作条件下,对两段式催化反应器进行模拟,得到了压降和绝热温升等反应器参数. 展开更多
关键词 丙烯腈尾气 多孔介质 CFD模拟 催化燃烧
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