摘要
采用间歇吸附试验探究壳聚糖改性硅藻土对废水中As(Ⅴ)的吸附性能。结果表明,壳聚糖改性硅藻土对As(Ⅴ)具有良好的吸附性。在As(Ⅴ)质量浓度为5 mg/L、pH值为3.0、吸附剂添加量为0.4 g/L、温度为25℃条件下,40 min即可达到吸附平衡,吸附效果显著,As(Ⅴ)去除率为92.96%。等温吸附过程符合Langmuir模型,理论最大吸附量为11.78 mg/g,吸附动力学过程符合准二级动力学方程,吸附速率主要受限于化学吸附。
The batch adsorption experiments were used to explore the adsorption characteristics of chitosan modified diatomite on As(Ⅴ)containing wastewater.The results show that chitosan-modified diatomite has good adsorption for As(Ⅴ).Under the condition of the As(Ⅴ)solution concentration of 5 mg/L,the pH value of 3,the adsorbent dosage of 0.4 g/L and the temperature of 25℃,the adsorption reaction reached equilibrium in 40 min,the removal rate of As(Ⅴ)reached 92.96%.The adsorption isotherm was more consistent with the Langmuir adsorption isotherm model,and the theoretical maximum adsorption capacity reached 11.78 mg/g.The adsorption kinetics of chitosan modified diatomite on As(Ⅴ)conformed to the pseudo-second-order kinetics,and the main rate-limiting step was chemical adsorption.
作者
杨勤桃
解庆林
陈南春
Yang Qintao;Xie Qinglin;Chen Nanchun(College of Environmental Science and Engineering,Guilin University of Technology,Guilin,Guangxi 541006;College of Materials Science and Engineering,Guilin University of Technology,Guilin,Guangxi 541004)
出处
《非金属矿》
CSCD
北大核心
2021年第5期103-106,共4页
Non-Metallic Mines
基金
国家自然科学基金(41662005、51564008)
广西环境污染控制理论与技术重点实验室研究基金(001102216078)。
