壳聚糖黄原酸盐对Cu^2＋的吸附性能  

Adsorption Properties of Chitosan Xanthogenate for Copper(Ⅱ)

作　　者：许海峰[1,2] 唐瑞仁[1] 曹佐英[2] 骆浩[2] 沈阳倩[2] 

机构地区：[1]中南大学化学化工学院,长沙410083 [2]湖南理工学院化学化工系,岳阳

出　　处：《应用化学》2008年第6期673-676,共4页Chinese Journal of Applied Chemistry

基　　金：湖南省自然科学基金(06JJ20003)资助项目

摘　　要：用红外、紫外和热重分析等测试技术分别对二硫代氨基甲酸改性壳聚糖（壳聚糖黄原酸钠,DTC-CTS）进行了表征和测试。比较了DTC-CTS与未改性的壳聚糖（CTS）对水溶液中Cu^2＋吸附性能的差别，考察了溶液的pH值、温度、时间及取代度对其吸附性能的影响。结果表明，DTC-CTS的取代度越高，吸附性能越好，对Cu^2＋吸附的最佳pH值范围为6．0～7．0，最佳温度为40℃，最佳吸附时间为0．5h。在最佳吸附条件下，DTC-CTS的吸附量为349．5mg／g，比CTS提高了7％。用体积分数为10％的氨水可将吸附在DTC-CTS上的Cu^2＋定量的洗脱，脱附率为96％，DTC，CTS能重复使用3次。Dithiocarbamate-modified chitosan （chitosan xanthogenate, DTC-CTS） was characterized respectively by infrared, UV-Vis and Thermogravimetry. The different adsorbing capacities of DTC-CTS and CTS for Cu^2＋ in aqueous solution were compared. The effects of pH, temperature, time and degree of substitution on the adsorbing capacity were investigated. The results demonstrate that the higher the degree of substitution, the better the adsorbing capacity. The optimum pH range of adsorption of DTC-CTS for Cu^＋2 is 6. 0 - 7. 0, the optimum adsorption temperature is 40℃, the optimum adsorption time is 0. 5 h. Under such conditions, the adsorbing content of DTC-CTS for Cu^2＋ is 349.5 mg/g, which is 7% more than that of CTS. Adsorbed Cu^2＋ can be quantitatively eluted from DTC-CTS with 10% ammonia at a washing off rate of 96%. DTC-CTS can be used for repeatedly three times.

关 键 词：壳聚糖 壳聚糖黄原酸盐 铜离子 吸附 

分 类 号：O636.1[理学—高分子化学]