香菇培养基废料吸附矿山酸性废水中铜离子  

Adsorption of copper ions from acid mine drainage using spent shiitake substrate

作　　者：林海[1] 曹丽霞[1] 陈月芳[1] 董颖博[1] 霍汉鑫[1] 徐丝瑜[1] 高琨[1] 李洋子[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《北京科技大学学报》2013年第9期1119-1125,共7页Journal of University of Science and Technology Beijing

基　　金：环保部环保公益性行业科研专项(201209013)

摘　　要：研究了废水pH值、Cu2+初始浓度、吸附剂投加量、时间及温度对香菇培养基废料吸附Cu2+的影响,并探讨了吸附机理.随着pH值的降低,吸附量显著降低;废料吸附Cu2+同时符合Langmuir模型和Freundlich模型,最大吸附量为33.11 mg·g-1;平衡吸附时间为1 h,拟二级动力学模型可以很好地描述吸附过程,相关系数为0.9995;吸附剂最佳投加量为10 g·L-1;吸附量随着温度的升高显著减少,热力学研究表明,该吸附过程放热,低温宜自发.对吸附前后的废料进行扫描电镜及Zeta电位分析表明,废料吸附Cu2+在低pH值下以物理吸附为主,而在较高pH值下以化学吸附为主.The effects of parameters including solution pH value, initial Cu^2＋ concentration, contact time, spent shiitake substrate dosage, and temperature on the adsorption of Cu^2＋ on the spent shiitake substrate were studied, and the adsorption mechanisms were also analyzed. As the initial pH value lowers, the adsorption capacity decreases. The adsorption of Cu^2＋ on the spent shiitake substrate follows well by the Langmuir and Freundlich equilibrium adsorption models. The maximum adsorption capacity of Cu^2＋ is 33.11 mg·g^-1. The equilibrium time is 1 h. The adsorption kinetic data fit the pseudo-second-order model very well with the correlation coefficient of 0.9995. The adsorbent dosage is optimized to 10 g·L^-1. Raising the temperature leads to an extreme drop of adsorption capacity. Thermodynamic studies indicate that the biosorption process is exothermic and can react spontaneously more easily at lower temperatures. By means of scanning electron microscopy and Zeta potentials, it is found that the adsorption of Cu^2＋ on the spent shiitake substrate is mainly a physical process at lower pH values, while a chemical one at higher pH values.

关 键 词：矿山酸性废水 生物吸附 铜 吸附机理 

分 类 号：X703.1[环境科学与工程—环境工程]