Immobilized Lentinus edodes residue as absorbent for the enhancement of cadmium adsorption performance  

作　　者：Pei MA Dan ZHANG 

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China [2]Graduate University of Chinese Academy of Sciences,Beijing 100049,China [3]Institute of Mountain Hazards and Environment,Chinese Academy of Sciences and Ministry of Water Conservancy,Chengdu 610041,China

出　　处：《Frontiers of Environmental Science & Engineering》2012年第4期498-508,共11页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China （Grant No. 40871111） and the Scientific and Technological Innovation Application of immobilized edible fungus residue in electroplating wastewater treatment： a case study in Beijing City Chinese Academy of Sciences.

摘　　要：To investigate the potential use of Lentinus edodes （L. edodes） residue for Cd^2＋ adsorption, poly alcohol Na alginate （PVA） was applied to immobilize it. The parameters including contact time, pH, adsorbent dosages, and coexisting metal ions were studied. The suitable pH for immobilized L. edodes was 4-7 wider than that for raw L. edodes （pH 6-7）. In the presence of Pb^2＋ concentration varying from 0 to 30mg.L^-1, the Cd^2＋ adsorption ratios declined by 6.71% and 47.45% for immobilized and raw L. edodes, respectively. While, with the coexisting ion Cu2＋ concentration varied from 0 to 30 mg.L^-1, the Cd^2＋ adsorption ratios declined by 12.97% and 50.56% for immobilized and raw L. edodes, respectively. The Cd^2＋ adsorption isotherms in singlemetal and dual-metal solutions were analyzed by using Langmuir, Freuxldlich, and Dubinin-Radushkevich models. The Cd^2＋ adsorption capacities （qm） in single-metal solution were 6.448 mg.L^-1 and 2.832 mg.L^-1 for immobilized and raw L. edodes, respectively. The qm of immobilized L. edodes were 1.850 mg Cd. gl in Cd^2＋ ＋ Pb^2＋ solution and 3.961mg Cd.g^-1 in Cd^2＋ ＋ Cu^2＋ solution, respectively. The Cd^2＋ adsorption processes subjected to both adsorbents follow pseudo-second-order model. Mechanism study showed the functional group of L. edodes was -OH, -NH, -CO, and PVA played an important role in metal adsorbing. Mining wastewater treatment test showed that PVA-SA-immobilized L. edodes was effective in mixed pollutant treatment even for wastewater containing metal ions in very low concentration.To investigate the potential use of Lentinus edodes （L. edodes） residue for Cd^2＋ adsorption, poly alcohol Na alginate （PVA） was applied to immobilize it. The parameters including contact time, pH, adsorbent dosages, and coexisting metal ions were studied. The suitable pH for immobilized L. edodes was 4-7 wider than that for raw L. edodes （pH 6-7）. In the presence of Pb^2＋ concentration varying from 0 to 30mg.L^-1, the Cd^2＋ adsorption ratios declined by 6.71% and 47.45% for immobilized and raw L. edodes, respectively. While, with the coexisting ion Cu2＋ concentration varied from 0 to 30 mg.L^-1, the Cd^2＋ adsorption ratios declined by 12.97% and 50.56% for immobilized and raw L. edodes, respectively. The Cd^2＋ adsorption isotherms in singlemetal and dual-metal solutions were analyzed by using Langmuir, Freuxldlich, and Dubinin-Radushkevich models. The Cd^2＋ adsorption capacities （qm） in single-metal solution were 6.448 mg.L^-1 and 2.832 mg.L^-1 for immobilized and raw L. edodes, respectively. The qm of immobilized L. edodes were 1.850 mg Cd. gl in Cd^2＋ ＋ Pb^2＋ solution and 3.961mg Cd.g^-1 in Cd^2＋ ＋ Cu^2＋ solution, respectively. The Cd^2＋ adsorption processes subjected to both adsorbents follow pseudo-second-order model. Mechanism study showed the functional group of L. edodes was -OH, -NH, -CO, and PVA played an important role in metal adsorbing. Mining wastewater treatment test showed that PVA-SA-immobilized L. edodes was effective in mixed pollutant treatment even for wastewater containing metal ions in very low concentration.

关 键 词：competitive immobilization Lentinus edodes residue adsorption ISOTHERM 

分 类 号：X173[环境科学与工程—环境科学] TQ424.1[化学工程]