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当前位置: 首页 > 文章 > 蒙脱土-稻壳炭复合材料对Pb(Ⅱ)吸附特性研究 农业环境科学学报 2018 (11) 2578-2585
Position: Home > Articles > Study of adsorption characteristics of Pb~(2+) on montmorillonite-rice husk bio-charcoal composites Journal of Agro-Environment Science 2018 (11) 2578-2585

蒙脱土-稻壳炭复合材料对Pb(Ⅱ)吸附特性研究

作  者：
谢厦;罗文文;王农;徐应明;孙约兵
单  位：
农业部环境保护科研监测所农业部产地环境污染防控重点实验室;农业部环境保护科研监测所天津市农业环境与农产品安全重点实验室
关键词：
稻壳炭;蒙脱土;插层复合;铅吸附
摘  要：
采用静态吸附实验,研究蒙脱土-稻壳炭复合材料对Pb~(2+)的吸附动力学和热力学特性,并考察吸附剂用量、共存离子及pH等因素对该复合材料吸附Pb~(2+)的影响。结果表明,复合材料对Pb~(2+)的吸附特性符合准二级动力学模型,等温吸附过程能较好地以Freundlich模型进行拟合,且是以物理吸附为主的自发的吸热反应。复合材料对Pb~(2+)的吸附量随吸附时间的延长先快速增加,后缓慢增加最终达到吸附平衡,且随着复合材料投加量的增加,Pb~(2+)的去除率增大。复合材料对水溶液中Pb~(2+)的吸附性能在pH为5时较好,吸附量达52.79 mg·g~(-1);不同浓度Ca~(2+)、Mg~(2+)均会对Pb~(2+)的吸附反应产生抑制作用,且Mg~(2+)的抑制作用更强。
译  名：
Study of adsorption characteristics of Pb~(2+) on montmorillonite-rice husk bio-charcoal composites
作  者：
XIE Sha;LUO Wen-wen;WANG Nong;XU Ying-ming;SUN Yue-bing;Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture, Agro-Environmental Protection Institute, Ministry of Agriculture;Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture;
关键词：
rice husk charcoal;;montmorillonite;;intercalation composite;;lead adsorption
摘  要：
Batch experiments were carried out to study the adsorption properties of Pb~(2+)on montmorillonite-rice husk carbon composites,and the effect of influencing factors such as the adsorbent dosage, coexisting ions, and pH on Pb~(2+)sorption was investigated.The results showed that the adsorption of Pb~(2+)was more consistent with the pseudo-second-order kinetic model.The isothermal adsorption of Pb~(2+)on composites could be well fitted with the Freundlich isothermal model, and the adsorption process was a spontaneous endothermic reaction based on physical adsorption.With an increase in adsorption time, the adsorption capacity of Pb~(2+)increased rapidly at first and then decreased gradually before, finally reaching the adsorption equilibrium.With an increase in the adsorbent dosage, the Pb~(2+)removal rate increased.The highest Pb~(2+)adsorption performance on the composites was observed at a pH of 5, and the adsorption capacity reached 52.79 mg·g~(-1).The presence of different concentrations of Ca~(2+)and Mg~(2+)in the solution inhibited Pb~(2+)adsorption, and the inhibitory effect of Mg~(2+)was stronger.

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