Polyhydroxyl-aluminum pillaring improved adsorption capacities of Pb^(2+) and Cd^(2+) onto diatomite  

作　　者：朱健 王平 雷明婧 张伟丽 

机构地区：[1]Institute of Environmental Science and Engineering Research,Central South University of Forestry & Technology

出　　处：《Journal of Central South University》2014年第6期2359-2365,共7页中南大学学报（英文版）

基　　金：Project(12JJ8016)supported by the Hunan Provincial Natural Science Foundation of China;Project(CX2012B317)supported by Hunan Provincial Innovation Foundation For Postgraduate,China;Project(2006180)supported by the Hunan Key Discipline Construction Found of Environmental Science,China

摘　　要：In order to greatly improve adsorption capacity, the diatomite was pillared by polyhydroxyl-aluminum.A series of adsorption tests were conducted to obtain the optimum condition for pillared diatomite synthesis. The scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （FTIR）, surface area and porosity analyzer and micro-electrophoresis were used to determine pore structure and surface property.The pillared diatomite attaining the optimal adsorption densities （qe） of Pb^2＋ and Cd^2＋ was synthesized with the following conditions： Addition of pillaring solution containing Al3＋-oligomers with a concentration range of 0.1-0.2 mol/L to a suspension containing Na＋-diatomite to obtain the required Al/diatomite ratio of 10 mmol/g; synthesis temperature of 80 ℃ for 120 min; aging at a temperature of 105 ℃ for 16 h. The adsorption capacities of Pb^2＋ and Cd^2＋ on pillared diatomite increase by 23.79% and 27.36% compared with natural diatomite, respectively. The surface property of pillared diatomite is more favorable for ion adsorption than natural diatomite. The result suggests that diatomite can be modified by pillaring with polyhydroxyl-aluminum to improve its adsorption properties greatly.In order to greatly improve adsorption capacity,the diatomite was pillared by polyhydroxyl-aluminum.A series of adsorption tests were conducted to obtain the optimum condition for pillared diatomite synthesis.The scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),surface area and porosity analyzer and micro-electrophoresis were used to determine pore structure and surface property.The pillared diatomite attaining the optimal adsorption densities(qe)of Pb2+ and Cd2+was synthesized with the following conditions: Addition of pillaring solution containing Al3+-oligomers with a concentration range of 0.1–0.2 mol/L to a suspension containing Na+-diatomite to obtain the required Al/diatomite ratio of 10 mmol/g; synthesis temperature of 80 °C for 120 min; aging at a temperature of 105 °C for 16 h.The adsorption capacities of Pb2+ and Cd2+ on pillared diatomite increase by 23.79% and 27.36% compared with natural diatomite,respectively.The surface property of pillared diatomite is more favorable for ion adsorption than natural diatomite.The result suggests that diatomite can be modified by pillaring with polyhydroxyl-aluminum to improve its adsorption properties greatly.

关 键 词：DIATOMITE PILLARING polyhydroxyl-aluminum synthesis ADSORPTION Pb^2＋ Cd^2＋ 

分 类 号：X703[环境科学与工程—环境工程]