改性柿子生物吸附剂对铜和铅的吸附性能  

Adsorption properties of modified persimmon biosorbent on Cu^(2+) and Pb^(2+)

作　　者：郭学益[1] 公琪琪[1] 梁沙[1] 田庆华[1] 肖彩梅[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2012年第2期599-603,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50774100)

摘　　要：以柿子粉为原料,分别采用硫酸和硝酸进行化学改性制备两种柿子生物吸附剂SPP和HPP,研究它们对Cu2+和Pb2+的吸附性能,考察溶液pH值、固液比、温度、吸附时间以及金属离子浓度及对吸附性能的影响。结果表明:SPP和HPP的吸附过程可以很好地用准二级动力学方程描述,吸附等温线用Langmuir方程拟合的效果优于Freundlich方程的;SPP对Cu2+和Pb2+的最大吸附容量分别为61.47 mg/g和207.90 mg/g,HPP对Cu2+和Pb2+的最大吸附容量分别为64.0 mg/g和220.8 mg/g,吸附过程为化学吸附所控制。The persimmon powder was used as raw material to prepare two persimmon biosorbents SPP and HPP by chemical modification with H2SO4 and HNO3,respectively.The adsorption behaviors of Cu2＋ and Pb2＋ in aqueous solutions on two persimmon biosorbents were investigated.The effects of solution pH,solid-liquid ratio,temperature,adsorption time and metal ion concentration were considered.The results show that the adsorption process of SPP and HPP can be well described by pseudo-second order kinetic equation.The fitting effect of equilibrium isotherms follows Langmuir equation better than that of the Freundlich equation.The maximum adsorption capacities of Cu2＋ and Pb2＋ on SPP are 61.47 mg/g and 207.90 mg/g,respectively.And the maximum adsorption capacities of Cu2＋ and Pb2＋ on HPP are 64.0 mg/g and 220.8 mg/g,respectively.The adsorption is controlled by chemical process.

关 键 词：改性柿子生物吸附剂 生物吸附 CU2+ PB2+ 

分 类 号：X703.1[环境科学与工程—环境工程]