高岭土负载壳聚糖处理铬渣污染地下水

采用高岭土负载壳聚糖复合吸附剂吸附处理铬渣污染的地下水,确定了最佳反应条件:壳聚糖与高岭土质量比为0.06,pH为4,吸附时间60 min,吸附剂用量为2.00 g/L,在此条件下去除率可达94.67%,Cr(Ⅵ)由0.5mg/L降至0.026 mg/L,可满足GB/T 14848—1993的Ⅲ类标准要求。该吸附剂对Cr(Ⅵ)的吸附过程符合Freundlich、Langmuir和D-R吸附等温模型,主要以物理吸附为主。研究表明高岭土负载壳聚糖适于处理铬渣污染的地下水。

Treatment of groundwater polluted by chromium residue with kaoline-chitosan compound adsorbent

The applicability of kaoline-chitosan as compound adsorbent for the removal of Cr(Ⅵ) from the groundwater polluted by chromium residue has been investigated.When the optimum reaction conditions are as follows:the mass ratio of kaoline and chitosan is 0.06,pH=4,adsorbing time 60 min and adsorbent dosage 2.00 g/L,the removing rate can reach 94.67% and the Cr(Ⅵ) concentration of the disposed groundwater is from 0.5 down to 0.026 mg/L,meeting the requirements of the third class of Quality Standard for Ground Water(GB/T 14848—1993).The adsorbing course of Cr(Ⅵ) by this adsorbent is in accordance with Freundlich,Langmuir and D-R adsorption isotherms.And,the mechanism is primarily based on physical adsorption.The experimental results show that kaoline-chitosan compound adsorbent is suitable for treating groundwater polluted by chromium residue.