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MoS2纳米片去除水中Cr(Ⅵ)的吸附性能和机理

作者:时间:2018-03-16点击数:

PDF全文下载:  201801012.pdf

 

文章编号: 16726987201801007307 DOI 10.16351/j.16726987.2018.01.012

 

宋慧, 高洪涛*

(青岛科技大学 生态化工国家重点实验室培育基地,山东 青岛 266042

 

摘要: 采用简单的一步水热法合成了薄片状纳米MoS2并将其用于吸附去除水中Cr()。片状MoS2Cr()具有非常好的吸附效果,反应不到160 min就达到了吸附平衡,Cr()的去除率可达97%Cr(Ⅵ)MoS2上的表面吸附是自发吸热的化学吸附过程,反应速率主要由扩散速率控制。其反应动力学符合准二级动力学模型,由Langmuir等温线计算的最大平衡吸附量为3622 mg·g-1。实验结果表明MoS2纳米片是一种优良的金属离子吸附剂。

关键词: MoS2纳米片; 水热法; Cr() 吸附性能; 吸附机理

中图分类号: X 52文献标志码: A

引用格式:宋慧, 高洪涛. MoS2纳米片去除水中Cr()的吸附性能和机理\[J\]. 青岛科技大学学报(自然科学版), 2018 391): 7379.

SONG Hui, GAO Hongtao. Adsorption efficiency and mechanism of MoS2 nanosheets for Cr() removal from aqueous solution\[J\]. Journal of Qingdao University of Science and TechnologyNatural Science Edition), 2018, 39(1) 7379.

 

Adsorption Efficiency and Mechanism of MoS2 Nanosheets for

Cr() Removal from Aqueous SolutionSONG Hui, GAO Hongtao

State Key Laboratory Base of Ecochemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

 

Abstract: MoS2 nanosheets, fabricated by a facile hydrothermal synthesis, was used for Cr () removal from contaminate water. The removal efficiency of MoS2 for Cr () was 97% in no more than 160 min and the maximum adsorption capacity was 3622 mg·g-1. The investigation on adsorption kinetics and isotherm showed that the pseudosecondorder kinetic and Langmuir isotherm models could well fit the adsorption experimental process. Adsorption thermodynamics investigation proved that the Cr() adsorption on the surface of MoS2 was a spontaneous endothermic physicchemical process, in which the rate of adsorption was controlled by exterior surface diffusion step. It illustrated that MoS2 nanosheets can be used as excellent adsorbent for heavy metal ions removal from wastewater.

Key words: MoS2 nanosheets; hydrothermal method; Cr(); adsorptive performance;

 

收稿日期:  20161106

基金项目: 国家自然科学基金项目(41573103.

作者简介: 宋慧(1989—),女,硕士研究生.*通信联系人.

 

 

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