稻壳对水体中铜离子的吸附去除研究

摘要

以稻壳为吸附剂，研究了其对水体中铜离子的吸附去除。结果表明：铜离子在稻壳上的吸附平衡时间为2h；增加溶液pH值有利于稻壳对铜离子的吸附；离子强度对稻壳吸附铜离子基本没有影响，说明铜离子在稻壳上的吸附是非离子交换作用；稻壳对铜离子的饱和吸附量为416.7 mg/g；与Langmuir方程相比， Freundlich方程能更好的描述稻壳对铜离子的吸附，其相关系数达到0.9881。%Adsorption removal of copper ion by ricehull was studied. Results showed that adsorption of copper ion on ricehull reached the equilibrium within 2 h. Adsorption amount of copper ion on ricehull increased with the increase of pH. Ion strength had no effect on the adsorption of copper ion, which indicated that ion exchange did not occur during adsorption of copper ion. The saturated adsorption amount of copper ion reached to 416. 7 mg/g. Compared to Langmuir adsorption model, Freundlich adsorption model more suitably fitted the adsorption isotherm of copper ion with a correlation coefficient of 0. 9981.