改性玉米秸秆对Cu^(2+)废水的吸附  

Adsorption of Cu^(2+) wastewater with modified corn straw

作　　者：刘江国[1] 陈玉成[1,2] 李杰霞[1,3] 刘波[1] 蒋小丽[1] 

机构地区：[1]西南大学资源环境学院,重庆400716 [2]重庆市农业资源与环境研究重点实验室,重庆400716 [3]重庆市江津区环境保护局,重庆402260

出　　处：《工业水处理》2010年第6期18-21,共4页Industrial Water Treatment

基　　金：重庆市科技攻关重点项目(CSTC2009AB7027)

摘　　要：采用改性玉米秸秆对含Cu2+废水进行吸附处理。研究了改性玉米秸秆吸附剂投加量、pH、温度对废水中Cu2+吸附作用的影响。结果表明:对质量浓度≤50mg/L的Cu2+废水,在秸秆投加质量为0.3g(质量浓度6g/L)、pH为6.5~7.0、吸附温度298K、吸附平衡时间35min条件下,对Cu2+的吸附率约97.2%,吸附量约10mg/g。改性玉米秸秆对Cu2+的吸附量随溶液中Cu2+平衡浓度、温度及吸附时间的增加而增加;吸附过程可用Langmuir、Freundlich和Temkin方程很好地拟合,其中Langmuir方程拟合得最好,最大饱和吸附量为12.195mg/g。吸附是一个自发吸热的快速反应过程,在35min内能达到稳定平衡,Elovich方程能更好地拟合该动力学特征。The influence of sorbent dosage, pH, temperature and contact time on the adsorption of Cu^2＋ by using modified corn straw have been studied. The results show that the adsorption rate of Cu^2＋ in the simulated wastewater is about 97.2%, and adsorption capacity is about l0 rag/g, when the dosage of corn straw is about 0.3 g （6 g/L） ,pH 6.5-7.0, adsorbing temperature 298 K and absorbing equilibrium time 35 minutes to the Cu^2＋ wastewater whose mass concentration is less than 50 mg/L. The adsorption capacity of modified corn straw to Cu^2＋ increases with the increase of Cu^2＋ equilibrium concentration in the solution, temperature, and absorbing time. The adsorption process can be fitted very well by Langmuir, Freundlich and Temkin equation. Among them, Langmuir equation described best. Its saturated adsorption capacity is 12.195 mg/g. The adsorption of Cu^2＋ with modified corn straw is a spontaneously enothermic reaction that reaches a stable balance within 35 min. Elovich equation is the best model to described the dynamics characteristic of Cu^2＋.

关 键 词：改性玉米秸秆 Cu2+废水 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]