| 罗文文,徐应明,王农,蔡彦明,孙约兵.贝壳粉对Cd(Ⅱ)的吸附性能研究[J].农业环境科学学报,2017,36(11):2240-2247. |
| 贝壳粉对Cd(Ⅱ)的吸附性能研究 |
| Adsorption performance of cadmium onto shell powder |
| 投稿时间：2017-04-20 |
| DOI：10.11654/jaes.2017-0583 |
| 中文关键词: 贝壳粉 镉 吸附量 影响因素 |
| 英文关键词: shell powder cadmium adsorption capacity influence factor |
| 基金项目:国家重点研发计划课题（2017YFD0801402）；天津市自然科学基金重点项目（17JCZDJC34200）；中国农科院基本科研业务费专项院级统筹项目（2017-syb-1） |
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| 摘要点击次数: 1932 |
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| 中文摘要: |
| 为了研究贝壳粉对Cd2+的吸附性能及最佳吸附条件，采用静态吸附实验研究了Cd2+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Cd2+性能的影响。结果表明：在不同Cd2+初始浓度下，随着吸附剂用量的增加，贝壳粉对Cd2+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Cd2+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Cd2+的吸附性能也随之增大，当pH ≥ 5时趋于稳定。随着Ca2+和Mg2+浓度增大，贝壳粉对Cd2+的吸附性能逐渐减弱，最大降幅分别达到15.19%和14.44%。 |
| 英文摘要: |
| To study the adsorption mechanisms and the optimum adsorption conditions of Cd2+ onto shell powder, batch experiments were conducted to investigate the effects of initial Cd2+ concentration, adsorbent dose, pH, temperature, time, and ionic strength on Cd2+ adsorption onto the shell powder. The results showed that the adsorption of Cd2+ onto the shell powder rapidly increased and then decreased gradually with the increase of sorption agent under different initial Cd2+ 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 Cd2+ 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 Cd2+ onto the shell powder increased with increasing pH, and then stabilized when the pH was ≥ 5. With increasing concentrations of Ca2+ and Mg2+, 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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