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。
Batch experiments were carried out to study the adsorption properties of PB2+ on montmorillonite-rice husk carbon composites, and the effect of influencing factors such as the adsorbent dosage, coexisting ions, and pH on Pb2+ sorption was investigated.The results showed that the adsorption of Pb2. was more consistent with the pseudo-second-order kinetic model.The isothermal adsorption of Pb2+ 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 Pb2+ increased rapidly at first and then decreased gradually before, finally reaching the adsorption equilibrium.With an increase in the adsorbent dosage, the Pb2+ removal rate increased.The highest Pb2+ 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 Ca2. and Mg2+ in the solution inhibited Pb2+ adsorption, and the inhibitory effect of Mg2+ was stronger.
作者
谢厦
罗文文
王农
徐应明
孙约兵
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 300191,China;Tianjin Key Laboratory of Agro-Environment and Agro-Product,Agro-Environmental Protection Institute,Ministry of Agriculture,Tianjin 300191,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2018年第11期2578-2585,共8页
Journal of Agro-Environment Science
基金
国家重点研发计划项目(2017YFD0801402
2018YFD080066)
天津市自然科学基金重点项目(17JCZDJC34200
18JCZDJC34000)~~
关键词
稻壳炭
蒙脱土
插层复合
铅吸附
rice husk charcoal
montmorillonite
intercalation composite
lead adsorption