有机坡缕石吸附Cu(Ⅱ)的研究  

Study on Adsorption of Copper(Ⅱ) by Organic-palygorskite

作　　者：常玥[1,2] 祁彩菊[1] 鲁峰[1] 应婵娟[1] 马红斌[1] 查飞[1] 

机构地区：[1]西北师范大学化学化工学院,兰州730070 [2]生态环境相关高分子材料教育部重点实验室,兰州730070

出　　处：《硅酸盐通报》2011年第6期1268-1272,共5页Bulletin of the Chinese Ceramic Society

基　　金：2011年国家自然基金项目(No.21161017);2010西北师范大学知识与科技创新工程项目(nwnu-kjcxgc-03-63);2010西北师范大学青年教师科研能力提升计划项目(NWNU-lkqn-10-9)

摘　　要：以γ-胺丙基三甲氧基硅烷(APS)修饰经季铵盐活化的坡缕石,研究了改性坡缕石对Cu(Ⅱ)的吸附行为。实验结果表明:经有机修饰的坡缕石吸附铜(Ⅱ)能力高于坡缕石原土,在温度为288 K,吸附剂用量20 mg,震荡时间为40 min,pH=5.5时,最大吸附量可达45.69 mg/g。此外,Cu(Ⅱ)在有机化坡缕石的吸附机理符合二级动力学,热力学参数说明,该吸附属自发进行,吸附热和熵变分别为36.19 kJ/mol和130.78 mol.K,吸附自由能随温度的升高而增加。The organo-palygorskite was prepared by γ-aminopropyltrimethoxysilane（APS） and quaternary ammonium salt.The sorption property of modified palygorskite for copper（Ⅱ） in water was studied.Comparing to natural palygorskite,adsorption ability of organo-palygorskite is higher in the treatment of copper（Ⅱ）.When the temperature was 288 K,the adsorbent amount was 20 mg,the shocking time was 40 min and the pH was 5.5,the maximum sorption capacity was 45.69 mg/g.The kinetic data indicated that the adsorption fitted well with the pseudo-second-order kinetic model.Thermodynamic paramelers calculated shows that the adsorption is a spontaneous and exothermic process.Enthalpy and entropy change of the adsorption of hydroquinone are 36.19 kJ/mol and 130.78 mol·K,respectively.Free energy of the adsorption increases with the increase of temperature.

关 键 词：有机化坡缕石 硅烷偶联剂 CU 吸附 动力学 

分 类 号：O647[理学—物理化学]