改性壳聚糖的制备及在电镀含铬废水中的应用-陕西师范大学学报期刊社网站

陕西师范大学学报（自然科学版）

化学与材料科学

改性壳聚糖的制备及在电镀含铬废水中的应用

刘存海，朱玉凤，张光华

(教育部轻化工助剂化学与技术重点实验室，陕西科技大学化学与化工学院，陕西西安 710021)

刘存海，男，副教授．主要从事环境化学及其水处理方面的研究．

摘要:

以过硫酸铵和亚硫酸氢钠为引发剂，在N2保护下，以丙烯酰胺为接枝物，对壳聚糖进行改性，制得了壳聚糖接枝丙烯酰胺共聚物（CAM），并将其应用于处理电镀含铬废水．确定了以壳聚糖接枝共聚物在处理含铬废水中的最佳加入量，以及适宜的搅拌时间、搅拌速度和最佳pH值等条件．结果表明, 对电镀含铬废水进行絮凝处理时的CAM的最佳用量为2 mg(CAM)/L (废水)，pH值为7.8时，搅拌速度为200 r/min，搅拌时间为3 min，沉降时间为4 h，其絮凝效果最好，铬的除去率达到94%．

关键词：

壳聚糖；接枝；丙烯酰胺；重金属离子；絮凝

收稿日期：

2009-02-20

中图分类号：

X703

文献标识码：

文章编号：

1672-4291(2009)06-0047-04

基金项目：

温州市科技计划资助项目（H20070015）

Doi:

The preparation of the modified chitosan and its application in treating the electroplating chromium-containing wastewater

LIU Cun-hai， ZHU Yu-feng， ZHANG Guang-hua

(Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi′an 710021, Shaanxi, China)

Abstract:

Chitosan was modified by acrylamide with ammonium persulfate and sodium sulfite as initiators under the protection of nitrogen.The resulting product,chitosan grafting acrylamide polymer (CAM),was obtained. Application of CAM in treatment of eleceroplating chromium-containing waste water was carried out.The parameters including amount of CAM, treated time,stirring speed and pH were optimized.The optimized results were as follows. A mount of CAM is 2 mg/L,the stirring speed is 200 r/min maintained 3 min, aging time is 4h, pH keeps at 7.8.The removal rate for chromium reaches 94%.

KeyWords:

chitosan; grafting; acrylamide; heavy metal ion; flocculating