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。

关键词: 改性玉米秸秆, Cu²⁺废水, 吸附

Abstract:

The influence of sorbent dosage， pH， temperature and contact time on the adsorption of Cu²⁺ by using modified corn straw have been studied. The results show that the adsorption rate of Cu²⁺ in the simulated wastewater is about 97.2%， and adsorption capacity is about 10 mg/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 Cu²⁺ wastewater whose mass concentration is less than 50 mg/L. The adsorption capacity of modified corn straw to Cu²⁺ increases with the increase of Cu²⁺ 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 Cu²⁺ with modified corn straw is a spontaneously endothermic reaction that reaches a stable balance within 35 min. Elovich equation is the best model to described the dynamics characteristic of Cu²⁺.

Key words: modified corn straw, copper ions wastewater, adsorption

中图分类号: 

• X703.1