稻秸秆纤维对Cu(Ⅱ)的吸附性能

Adsorption property of rice straw fiber to copper ions

为研究稻秸秆纤维对Cu^(2+)的吸附性能,测试了Cu^(2+)初始质量浓度、处理时间、处理温度、固液比和pH值等因素对稻秸秆纤维吸附效果的影响,并对吸附前后的稻秸秆红外光谱进行了分析比较。实验结果表明:稻秸秆纤维对铜离子的吸附以物理吸附为主,也存在少量化学吸附;稻秸秆纤维对Cu^(2+)具有快速、良好的吸附性能,尤其是对低质量浓度的Cu^(2+)溶液吸附效果较好;溶液的初始pH值对稻秸秆纤维吸附作用影响较大,环境温度对稻秸秆纤维吸附作用影响较小;当固液比值为7.5 mg/L、溶液初始pH值为5时,稻秸秆对Cu^(2+)的吸附性能达到最佳。

In order to study the adsorption properties of rice straw fiber to Cu-（2＋） ,the influence of initial Cu-（2＋） concentration, time, temperature, ratio of solid to liquid and pH value on adsorption were discussed. The infrared spectroscopy before and after adsorption were analyzed and compared. The results show that the adsorption of Cu-（2＋） by rice straw fiber mainly is a physical adsorption. At the same time,a very small amount of chemical adsorption exists in the adsorption process. Rice straw fiber,for Cu-（2＋） ,has fast and good adsorption properties,and has better adsorption effect especially for Cu-（2＋） of low concentration; the influence of the initial pH value on the adsorption properties of rice straw fiber is large,ambient temperature has less effect on the adsorption properties of rice straw fibers; and when the solid- liquid ratio of 7. 5 mg / L,the initial pH value is 5,and the adsorption properties of rice straw to Cu-（2＋） reach the best.