文章摘要
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    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)
作者单位E-mail
罗文文 农业部环境保护科研监测所 农业部产地环境污染防控重点实验室, 天津 300191
农业部环境保护科研监测所 天津市农业环境与农产品安全重点实验室, 天津 300191 
 
徐应明 农业部环境保护科研监测所 农业部产地环境污染防控重点实验室, 天津 300191
农业部环境保护科研监测所 天津市农业环境与农产品安全重点实验室, 天津 300191 
 
王农 农业部环境保护科研监测所 农业部产地环境污染防控重点实验室, 天津 300191  
蔡彦明 农业部环境保护科研监测所 农业部产地环境污染防控重点实验室, 天津 300191  
孙约兵 农业部环境保护科研监测所 农业部产地环境污染防控重点实验室, 天津 300191
农业部环境保护科研监测所 天津市农业环境与农产品安全重点实验室, 天津 300191 
sunyuebing@aepi.org.cn 
摘要点击次数: 2108
全文下载次数: 2669
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.
HTML    查看全文   查看/发表评论  下载PDF阅读器