响应面优化制备CTS-GSH及其对铬(Ⅵ)的去除研究  

RESPONSE SURFACE METHODOLOGY FOR SYNTHESIS OF CHITOSAN-GLUTATHOINE TO REMOVE Cr(Ⅵ)

作　　者：张鹏[1] 张伟[1] 廖为雄 朱国成[1] 丁文杰[1] 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《环境工程》2017年第3期52-56,91,共6页Environmental Engineering

基　　金：国家自然科学基金项目(41502331;51408215);湖南省教育厅优秀青年基金项目(14B059)

摘　　要：以壳聚糖(CTS)与还原型谷胱甘肽(GSH)为原料,通过酰胺化反应合成了巯基化壳聚糖CTS-GSH混凝剂。采用Cr(Ⅵ)去除率为因变量,以CTS/GSH质量比、EDAC用量、反应体系pH值为自变量,设计了Box-Behnken模型。通过响应面法分析优化CTS-GSH的合成条件。模型分析显示:实测Cr(Ⅵ)去除率与模拟Cr(Ⅵ)去除率的相关决定系数为0.998,调整相关决定系数为0.995,表明预测值与实际值相关性强,模型预测Cr(Ⅵ)去除率具有较好的准确度。实验结果表明:当CTS/GSH质量比为1∶1,交联剂EDAC用量为0.25 g,反应体系pH值为3.5时,CTS-GSH性能最好;且水中Cr(Ⅵ)初始浓度5.0 mg/L,CTS-GSH投加量为140 mg/L,静置时间3.0 h时,Cr(Ⅵ)去除率达到最大值99.8%。证明采用CTS-GSH对水中的Cr(Ⅵ)具有较好的去除效果。Thiolated chitosan coagulant（ CTS-GSH） was synthesized through amidation reaction with crude materials including chitosan（ CTS） and glutathione（ GSH）. The Box-Behnken model with the dependent variable（ Cr（ Ⅵ） removal rate） and the independent variables（ CTS/GSH mass ratio,EDAC dosage,system pH） was designed. The response surface method was applied to analyze the optimum condition of preparing the CTS-GSH. The modeling result showed that measured Cr（ Ⅵ）removal rate and the predicted has a good correlation coefficient of 0. 998 and the adjusted correlation coefficient was up to0. 995,which indicated that the measured value was well correlated with the predicted value. Overall,this demonstrated that the model was accurate enough for prediction of Cr（ Ⅵ） removal rate. The experimental results showed that the best CTS-GSH was prepared when the chitosan/glutathione mass ratio was 1 ∶ 1,cross-linking agent was 0. 25 g,and pH value was at 3. 5.Also,the maixmum Cr（ Ⅵ） removal rate of 99. 8% was attained with CTS-GSH of 100 mg/L at sedimetation time of 3. 0 h for Cr（ Ⅵ） concentration at 5 mg/L,suggesting that the CTS-GSH had a better effect on removal of aqueous Cr（ Ⅵ）.

关 键 词：响应面法 巯基 壳聚糖 强化混凝 除铬 

分 类 号：X703[环境科学与工程—环境工程]