麦壳对水溶液中铜离子的动态吸附研究  

ADSORPTION OF COPPER(Ⅱ) FROM AQUEOUS SOLUTION BY WHEAT SHELL IN A FIXED-BED COLUMN

作　　者：李玉飞[1] 高聪丽[1] 豆婵婵[1] 宋继贇[1] 和笑天[1] 韩润平[1] 

机构地区：[1]郑州大学化学系,郑州450001

出　　处：《离子交换与吸附》2011年第2期103-109,共7页Ion Exchange and Adsorption

基　　金：中国博士后科学基金(No.20070420811);国家人才培养基金子(No.J0830412);河南省自然科学基金(92300410030)

摘　　要：对麦壳柱吸附铜离子的动态实验进行了研究。pH为5时有利于吸附,Na+和Ca2+的存在不利于吸附,说明在吸附过程中存在离子交换机理。溶液流速、溶液浓度对流出曲线有较大的影响。吸附后的麦壳用0.5mol/L盐酸再生,能重复使用。对不同流速和不同浓度的流出曲线用Thomas和Yoon-Nelson线性模型进行了拟合,并预测了流出曲线。结果表明,饱和吸附量随着初始浓度的增大而增大,随流速的增加而减小;穿透时间随初始浓度和流速的增大均减小。在不同条件下的线性相关系数为0.920～0.948,说明Thomas和Yoon-Nelson模型都可用于描述穿透曲线。A continuous adsorption study in a fixed-bed column was carried out by using wheat shell as an adsorbent for the removal of copper cation from aqueous solution.The effects of important factors,such as the value of initial solution pH,existing salt,the flow rate and the influent concentration of CR,were studied.The existing salt had negative effect on copper cation adsorption.Data confirmed that the breakthrough curves were dependent on flow rate,initial dye concentration.Also the adsorption/desorption recycles of wheat shell were shown,and the results indicated that wheat shell could be recycled to remove copper ions.Thomas and Yoon–Nelson models were applied to experimental data to predict the breakthrough curves using linear regression analysis and to determine the characteristic parameters of the column useful for process design.The value of adsorption capacity from models increased with the decrease in flow rate and the increase in influent concentration,while the breakthrough time decreased with the increase in flow rate and initial concentration.

关 键 词：麦壳 吸附 铜离子 柱 

分 类 号：X703[环境科学与工程—环境工程]