Ammonium sulfide-assisted hydrothermal activation of palygorskite for enhanced adsorption of methyl violet  

作　　者：Guangyan Tian Wenbo Wang Yuru Kang Aiqin Wang 

机构地区：[1]Center for Eco-material and Green Chemistry,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of the Chinese Academy of Sciences,Beijing 100049,China [3]R&D Center of Xuyi Palygorskite Applied Technology,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Xuyi 211700,China

出　　处：《Journal of Environmental Sciences》2016年第3期33-43,共11页环境科学学报（英文版）

基　　金：supported by the“863”Project of the Ministry of Science and Technology,People's Republic of China(No.2013AA032003);the National Natural Science Foundation of China(No.51403221)

摘　　要：Herein,palygorskite（PAL）was activated via a simple hydrothermal process in the presence of ammonium sulfide,and the effects of activation on the microstructure,physico-chemical feature and adsorption behaviors of PAL were intensively investigated.The hydrothermal process evidently improved the dispersion of PAL crystal bundles,increased surface negative charges and built more active –Si–O-groups served as the new＂adsorption sites＂.The adsorption property of the activated PAL for Methyl Violet（MV）was systematically investigated by optimizing the adsorption variables,including p H,ionic strength,contact time and initial MV concentration.The activated PAL exhibited a superior adsorption capability to the raw PAL for the removal of MV（from 156.05 to 218.11 mg/g）.The kinetics for MV adsorption followed pseudo second-order kinetic models,while the isotherm and thermodynamics results showed that the adsorption pattern well followed the Langmuir model.The structure analysis of PAL before and after adsorption demonstrated that electrostatic interaction and chemical association of –X–O-are the prominent driving forces for the adsorption process.Herein,palygorskite（PAL）was activated via a simple hydrothermal process in the presence of ammonium sulfide,and the effects of activation on the microstructure,physico-chemical feature and adsorption behaviors of PAL were intensively investigated.The hydrothermal process evidently improved the dispersion of PAL crystal bundles,increased surface negative charges and built more active –Si–O-groups served as the new＂adsorption sites＂.The adsorption property of the activated PAL for Methyl Violet（MV）was systematically investigated by optimizing the adsorption variables,including p H,ionic strength,contact time and initial MV concentration.The activated PAL exhibited a superior adsorption capability to the raw PAL for the removal of MV（from 156.05 to 218.11 mg/g）.The kinetics for MV adsorption followed pseudo second-order kinetic models,while the isotherm and thermodynamics results showed that the adsorption pattern well followed the Langmuir model.The structure analysis of PAL before and after adsorption demonstrated that electrostatic interaction and chemical association of –X–O-are the prominent driving forces for the adsorption process.

关 键 词：Palygorskite Hydrothermal Adsorption Methyl violet 

分 类 号：X703[环境科学与工程—环境工程]