改性柚皮吸附剂对水中镉的吸附研究

Adsorption of Cd2+in Water by Modified Pomelo Peel Biosorbent

本文以安江香柚皮为原料,制备碱化改性柚皮吸附剂,探讨了吸附剂添加量、初始pH值、吸附温度、吸附时间、Cd^(2+)初始浓度对水中Cd^(2+)吸附效果的影响。结果表明:在Cd^(2+)初始浓度不大于100 mg/L,pH值5~7,加入6 g/L的吸附剂,30℃吸附60 min时,吸附效果较好,吸附率达90%以上,吸附分层立体片符合准二级动学模型,等温吸附规律符合用Freundlich和Langmuir模型。柚皮制备吸附剂有良好的应用前景。

In this paper,Anjiang pomelo peel was used as raw material to prepare NaOH-modified biosorbent.The effects of the amount of adsorbent,initial pH value,adsorption temperature,adsorption time,and initial concentration of Cd^(2+)on the adsorption were discussed.The results showed that:when the initial concentration of Cd^(2+)was not more than 100 mg/L,pH value was 5~7,6 g/L of adsorbent was added,and adsorption at 30℃for 60 min,the adsorption effect was good,and the adsorption rate was more than 90%.The adsorption kinetics law conformed to pseudo second order model and the isothermal adsorption can be described well by Freundilich and Langmuir model.The biosorbent prepared from pomelo peel has a good application prospect.