Highly effective removal of Methylene Blue using functionalized attapulgite via hydrothermal process  

作　　者：Zhifang Zhang Wenbo Wang Aiqin Wang 

机构地区：[1]Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences [2]University of the Chinese Academy of Sciences [3]R&D Center of Xuyi Attapulgite Applied Technology, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences

出　　处：《Journal of Environmental Sciences》2015年第7期106-115,共10页环境科学学报（英文版）

基　　金：supported by the Hi-Tech research and Development Program (863) of China (No. 2013AA032003);the West Light Foundation of the Chinese Academy of Sciences (the Science Development Talent Teach words [2012] No. 179)

摘　　要：Attapulgite（APT） has been frequently used for the adsorptive removal of dyes from aqueous solution owing to its unique one-dimensional nanoscale structure and low-cost, abundant,eco-friendly advantages. In this work, APT was functionalized under mild hydrothermal condition using chloroacetic acid（CA） with ／COOH functional groups to improve its adsorption properties. The effect of hydrothermal modification on the microstructure and physicochemical features of APT was investigated by Fourier transform infrared spectroscopy, X-ray diffraction and Field-emission scanning electron microscopy analyses. The effects of hydrothermal reaction parameters on the adsorption properties of modified APT were intensively investigated. It was revealed that the rearrangement of crystal structure and the surface functionalization of APT with ／COOH groups cause the surprising increase of adsorption capability for Methylene Blue（MB）. The removal ratio of raw APT for MB is only 59.52%, while modified APT could almost completely remove MB in the 200 mg/L of MB solution with a removal ratio of 99.8%. The adsorption kinetics fitted pseudo second-order kinetic model, and the adsorption isotherm could be described with Langmuir isotherm model very well. The hydrogen-bonding interaction, electrostatic attraction and chemical association are the main driving force for the adsorption process.Attapulgite（APT） has been frequently used for the adsorptive removal of dyes from aqueous solution owing to its unique one-dimensional nanoscale structure and low-cost, abundant,eco-friendly advantages. In this work, APT was functionalized under mild hydrothermal condition using chloroacetic acid（CA） with ／COOH functional groups to improve its adsorption properties. The effect of hydrothermal modification on the microstructure and physicochemical features of APT was investigated by Fourier transform infrared spectroscopy, X-ray diffraction and Field-emission scanning electron microscopy analyses. The effects of hydrothermal reaction parameters on the adsorption properties of modified APT were intensively investigated. It was revealed that the rearrangement of crystal structure and the surface functionalization of APT with ／COOH groups cause the surprising increase of adsorption capability for Methylene Blue（MB）. The removal ratio of raw APT for MB is only 59.52%, while modified APT could almost completely remove MB in the 200 mg/L of MB solution with a removal ratio of 99.8%. The adsorption kinetics fitted pseudo second-order kinetic model, and the adsorption isotherm could be described with Langmuir isotherm model very well. The hydrogen-bonding interaction, electrostatic attraction and chemical association are the main driving force for the adsorption process.

关 键 词：ATTAPULGITE HYDROTHERMAL Chloroacetic acid Methylene Blue ADSORPTION 

分 类 号：X788[环境科学与工程—环境工程]