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当前位置: 首页 > 文章 > 贝壳粉对Cd(Ⅱ)的吸附性能研究 农业环境科学学报 2017,36 (11) 2240-2247
Position: Home > Articles > Adsorption performance of cadmium onto shell powder Journal of Agro-Environment Science 2017,36 (11) 2240-2247

贝壳粉对Cd(Ⅱ)的吸附性能研究

作  者：
罗文文;徐应明;王农;蔡彦明;孙约兵
关键词：
贝壳粉;镉;吸附量;影响因素
摘  要：
为了研究贝壳粉对Cd~(2+)的吸附性能及最佳吸附条件,采用静态吸附实验研究了Cd~(2+)初始浓度、吸附剂用量、温度、pH、吸附时间以及离子强度对贝壳粉吸附Cd~(2+)性能的影响。结果表明:在不同Cd~(2+)初始浓度下,随着吸附剂用量的增加,贝壳粉对Cd~(2+)的吸附量呈现出先强烈吸附后逐渐缓和的趋势,符合准一级动力学模型和准二级动力学方程。Temkin和Langmuir模型均能较好地描述贝壳粉对Cd~(2+)的等温吸附过程,约30 min达到平衡,为自发的吸热反应,最大饱和吸附量为161.75 mg·g~(-1)。随着溶液pH值增加,贝壳粉对Cd~(2+)的吸附性能也随之增大,当pH≥5时趋于稳定。随着Ca~(2+)和Mg~(2+)浓度增大,贝壳粉对Cd~(2+)的吸附性能逐渐减弱,最大降幅分别达到15.19%和14.44%。
译  名：
Adsorption performance of cadmium onto shell powder
作  者：
LUO Wen-wen;XU Ying-ming;WANG Nong;CAI Yan-ming;SUN Yue-bing;Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agricultural, Agro-Environmental Protection Institute, Ministry of Agriculture;Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture;
单  位：
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agricultural, Agro-Environmental Protection Institute, Ministry of Agriculture%Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture
关键词：
shell powder;;cadmium;;adsorption capacity;;influence factor
摘  要：
To study the adsorption mechanisms and the optimum adsorption conditions of Cd~(2+)onto shell powder, batch experiments were conducted to investigate the effects of initial Cd~(2+)concentration, adsorbent dose, pH, temperature, time, and ionic strength on Cd~(2+)adsorption onto the shell powder. The results showed that the adsorption of Cd~(2+)onto the shell powder rapidly increased and then decreased gradually with the increase of sorption agent under different initial Cd~(2+) concentration, and the adsorption fitted well to pseudo-first-order and pseudo-second-order kinetics. The isothermal adsorption was well described by the Temkin isotherm and the Langmuir isotherm. The adsorption process of Cd~(2+)was a spontaneous and endothermic reaction that achieved adsorption equilibrium in only 30 min, and the maximum equilibrium adsorption capacity was 161.75 mg·g~(-1). The adsorption of Cd~(2+) onto the shell powder increased with increasing pH, and then stabilized when the pH was ≥5. With increasing concentrations of Ca~(2+)and Mg~(2+), the adsorption properties of the shell powder gradually decreased,with maximum reductions of 15.19% and 14.44%, respectively, compared with the control group.

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