冰乙酸改性狐尾藻对铜离子的吸附

A dsorption of copper ions by modified myriophyllum with acetic acid

以廉价而且易种植培育的沉水植物为原料,吸附重金属离子,降低废水中重金属离子浓度.采用冰乙酸对沉水植物狐尾藻进行改性,然后,取酸改性狐尾藻置于600 mg/L,pH=4的硝酸铜溶液搅拌处理2h,测试吸附重金属Cu^2+的能力.结果表明,狐尾藻经冰乙酸改性之后,吸附性能更好,对废水中重金属Cu^2+的吸附效率达到92.2%,高于未改性狐尾藻的吸附效率(85.6%).三次循环吸附后,吸附效率仍达到86.3%,拟合Elovich方程,第一次循环吸附R^2=0.9998,第四次循环吸附R^2=0.9999,线性关系均较好,表明拟合的二级动力学方程得到的最大吸附量与实验值基本吻合,为生物吸附材料的开发提供了理论依据.

The submerged plants which are cheap and easy to cultivate were used as raw materials to absorb heavy metal ions and reduce the concentration of heavy metal ions in wastewater.Glacial acetic acid was used to modify the submerged plant Foxtail algae.Then,the acid-modified foxtail algae were placed in copper nitrate solution(600 mg/L,pH4)and stirred for 2 h to test its ability to absorb heavy metal Cu^2+.After modification with glacial acetic acid,the adsorption performance of Foxtail algae was increased.The adsorption efficiency of heavy metal Cu^2+in wastewater reached 92.2%,which was higher than that of unmodified Foxtail algae(85.6%).After three cycles of adsorption,the adsorption efficiency still reached 86.3%.The Elovich equation was fitted.The first cycle adsorption was R^2=0.9998,and the fourth cycle adsorption,R^2=0.9999.The linear relationship was good.It showed that the maximum adsorption capacity obtained by the fitting second-order kinetic equation was basically consistent with the experimental value,which provided a theoretical basis for the development of biological adsorption materials.