摘要：
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。
关键词:
高岭土,
壳聚糖,
复合吸附剂,
地下水,
Cr(Ⅵ)
Abstract:
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.
Key words:
kaoline,
chitosan,
compound adsorbent,
groundwater,
Cr（Ⅵ)
中图分类号:
刘荣香, 张焕祯, 刘峻平. 高岭土负载壳聚糖处理铬渣污染地下水[J]. 工业水处理, 2012, 32(5): 44-47.
Liu Rongxiang, Zhang Huanzhen, Liu Junping. Treatment of groundwater polluted by chromium residue with kaoline-chitosan compound adsorbent[J]. INDUSTRIAL WATER TREATMENT, 2012, 32(5): 44-47.