水华蓝藻生物质与底泥混合物对溶液中Cd的吸附作用  

Adsorption of Cd from Aqueous Solution by Mixture of Cyanobacterial Bloom Biomass and Sediment

作　　者：李溦[1] 邵继海[1] 曾清如[1] 苗霄霖[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《安徽农业科学》2015年第13期187-189,288,共4页Journal of Anhui Agricultural Sciences

基　　金：国家重大水专项(2014ZX07206001-03)

摘　　要：[目的]研究水华蓝藻生物质与洞庭湖底泥混合物对水体中Cd^2＋的吸附作用。[方法]将水华蓝藻生物质与洞庭湖底泥混合，研究混合物在不同pH、不同起始浓度、不同温度、不同吸附时间以及不同混合物比例下对cd的吸附性能，并进行了解吸附试验。[结果]混合物对c∥’的最大理论吸附量是4．16mg／g，在pH=4～5时吸附效率较差，在pH=6～8时混合物对Cd保持良好的吸附效率。Cd的吸附在2h内基本完成．并且较符合一级动力学方程。而温度对混合物吸附Cd的效率并无太显著的影响。吸附过程较符合Freundlich方程式的拟舍。解吸附试验说明，混合物对Cd的吸附主要是通过离子交换和表面络舍的方式。[结论]由于蓝藻水华具有巨大的生物量。其在去除水体中重金属方面具有广阔的应用前景。[Objective] The research aims to study adsorption of Cd^2＋ from water body by the mixture of cyanobacterial bloom biomass and sediment from Dongting Lake. [ Method] By mixing cyanobacterial bloom biomass and sediment from Dongting Lake, adsorption capacity of Cd by the mixture under different pH, initial concentrations, temperatures, adsorption times and composition proportions is studied, and desorp- tion test is conducted. [ Result] The theoretical maximum adsorption value of Cd^2＋ by mixture is 4.16 mg/g. The adsorption efficiency for Cd is poor at pH 4 - 5, while it is good at pH 6 - 8. In the dynamic experiment, the maximum adsorption for Cd completes within 2 h, and it ac- cords with pseudo-first-order equation. Effect of temperature on Cd adsorption by mixture is not significant, and adsorption process corresponds with the fitting of Freundlich equation. The desorption experiment shows that the adsorption way of Cd by mixture is mainly ion exchange and surface complexation. [ Conclusion] Because cyanobacterial bloom has huge biomass, it has broad application prospect in heavy metal removal from water body.

关 键 词：水华蓝藻生物质 底泥 CD 吸附 

分 类 号：S181.3[农业科学—农业基础科学]