(中南大学 冶金科学与工程学院，长沙 410083)
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。
关键字: 改性柿子生物吸附剂；生物吸附；Cu2+；Pb2+
Cu2+ and Pb2+
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: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.
Key words: modified persimmon biosorbent; biosorption; Cu2+; Pb2+
