热处理富钙海泡石对水体中砷的吸附特征

doi:10.11934/j.issn.1673-4831.2017.09.008

生态与农村环境学报 ›› 2017, Vol. 33 ›› Issue (9): 822-829.doi: 10.11934/j.issn.1673-4831.2017.09.008

热处理富钙海泡石对水体中砷的吸附特征

闫晓伟^1,2, 尹洪斌², 唐婉莹¹

1. 南京理工大学化工学院, 江苏南京 210094;
2. 中国科学院南京地理与湖泊研究所/湖泊与环境国家重点实验室, 江苏南京 210008

收稿日期:2016-10-31 出版日期:2017-09-25 发布日期:2017-09-25
通讯作者: 尹洪斌,E-mail:hbyin@niglas.ac.cn E-mail:hbyin@niglas.ac.cn
作者简介:闫晓伟(1990-),男,山东菏泽人,硕士,主要从事污染水体中重金属的吸附和控制研究。E-mail:326041541@qq.com.
基金资助:
国家水体污染治理重大专项（2012ZX07103-005）；江苏省社会发展项目（BE2016811）

Arsenic Adsorption Behaviors of Heated Calcium-Rich Sepiolite in Water.

YAN Xiao-wei^1,2, YIN Hong-bin², TANG Wan-ying¹

1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. State Key Laboratory of Lake Science and Environment/Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China

Received:2016-10-31 Online:2017-09-25 Published:2017-09-25

摘要/Abstract

摘要：

以富钙海泡石为研究对象，利用简单易行的热处理方法改性，并用X-射线荧光光谱仪（XRF）、X-射线衍射仪（XRD）和扫描电子显微镜（SEM-EDS）对原状和热处理富钙海泡石进行成分和结构分析，研究改性材料对As³⁺和As⁵⁺的吸附特征和影响因素。结果表明，热处理改性显著增加了富钙海泡石对砷的吸附性能，当pH值为7时，对As³⁺和As⁵⁺的最大理论吸附量分别为25.61和30.30 mg·g^-1，且吸附等温式符合Langmuir模型；利用吸附动力学方程拟合发现，改性富钙海泡石对As³⁺动力学吸附符合准二级动力学模型，而对As⁵⁺的吸附符合准一级动力学模型和准二级动力学模型。材料粒径对热处理富钙海泡石吸附砷影响较小，当pH值为6~11时，热处理富钙海泡石对砷的吸附影响很小；共存阴离子中PO₄^3-对砷吸附量的影响最大。该研究表明成本较低的热处理富钙海泡石可有效去除废水中的砷。

关键词: 富钙海泡石, 热处理, 三价砷, 五价砷

Abstract:

Calcium-rich sepiolite was taken as an object for study, in which it was modified by heating, and then analyzed for changes in composition and structure from the original with XRF, XRD, and SEM-EDS, separately. Moreover, effects of the modification on its adsorption of As³⁺ and As⁵⁺ and their influencing factors were studied. Results show that the modification significantly increased sepiolite's As adsorption capacity. Its As³⁺ and As⁵⁺ adsorption capacity in water with pH being 7 in value reached theoretically as high as 25.61 mg·g^-1 and 30.30 mg·g^-1, respectively, with adsorption isotherms fitting the Langmuir model. Fitting of its As adsorption kinetics reveals that its As³⁺ adsorption was in consistence with the pseudo-second order model, while its As⁵⁺ adsorption was with both the pseudo-first and -second order kinetics models. Besides, the study of influencing factors found that changes in particle size was not a major factor affecting As adsorption of the modified calcium-rich sepiolite and neither was pH (6-11). Among the co-existing ions, PO₄^3- was found to be the major one. The low-cost thermal treated calcium rich sepiolite was proven to be an effective arsenic remover in the wastewater.

Key words: calcium-rich sepiolite, heat treatment, arsenic, arsenate

中图分类号:

闫晓伟, 尹洪斌, 唐婉莹. 热处理富钙海泡石对水体中砷的吸附特征[J]. 生态与农村环境学报, 2017, 33(9): 822-829.

YAN Xiao-wei, YIN Hong-bin, TANG Wan-ying. Arsenic Adsorption Behaviors of Heated Calcium-Rich Sepiolite in Water.[J]. Journal of Ecology and Rural Environment, 2017, 33(9): 822-829.

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热处理富钙海泡石对水体中砷的吸附特征

Arsenic Adsorption Behaviors of Heated Calcium-Rich Sepiolite in Water.

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