FeS胶体对三价铁吸附态As(Ⅴ)的解吸作用

成东; 廖鹏; 袁松虎

doi:10.3799/dqkx.2016.024

FeS胶体对三价铁吸附态As(Ⅴ)的解吸作用

doi: 10.3799/dqkx.2016.024

中国地质大学生物地质与环境地质国家重点实验室，湖北武汉 430074

基金项目:

教育部新世纪优秀人才支持计划 NCET-13-1014

详细信息

作者简介:
成东(1990-)，男，在读硕士，主要从事沉积物中胶体与污染物相互作用研究.E-mail: justin_chengcug@163.com

通讯作者:
袁松虎，E-mail：yuansonghu622@cug.edu.cn

中图分类号: X523
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出版历程
- 收稿日期: 2015-08-30
- 刊出日期: 2016-02-15

Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron

State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 地下水中的含铁胶体颗粒会携带污染物如砷等运移，但人们对该过程中的机理缺乏认识.通过群组静态吸附解吸模拟实验, 探究FeS胶体对吸附在覆Fe₂O₃石英砂上As(Ⅴ)的解吸作用, 以及腐殖酸(HA)、H₂PO₄^-和HCO₃^-对解吸的影响.实验结果表明，室内合成的FeS胶体具有纳米级粒径和较大的比表面积，且能均匀稳定存在于水溶液中.低浓度的FeS胶体主要通过竞争覆Fe₂O₃石英砂表面的吸附点位将As(Ⅴ)解吸，而高浓度的FeS胶体主要通过与覆Fe₂O₃石英砂竞争对As(Ⅴ)的吸附而导致解吸.HA、H₂PO₄^-和HCO₃^-对As(Ⅴ)的竞争解吸作用降低了FeS胶体导致的解吸效率.
- FeS胶体 /
- 沉积物 /
- As(Ⅴ) /
- 地下水
Abstract: The iron colloids in groundwater are associated with contaminants such as arsenate in transport processes, but the mechanism underlying the process is not clear. In this study, batch static adsorption and desorption experiments were conducted to investigate the effect of FeS colloids on desorption of As(Ⅴ) adsorbed on Fe₂O₃-coated sand, as well as the influences of HA, H₂PO₄^- and HCO₃^- on the desorption. Results show that FeS colloids at low concentrations desorbed As (V) mainly by competing adsorption sites on the surface of Fe₂O₃-sand, while desorption at high concentrations is mainly due to the competitive adsorption for As (V) with Fe₂O₃-sand. As HA (humic acid), H₂PO₄^- and HCO₃^- could desorb As (V) from Fe₂O₃-sand, As (V) desorption by FeS colloids was reduced. The results may better our understanding of the mechanisms of the arsenate release from sediments into groundwater.
- FeS colloids /
- sediment /
- As(Ⅴ) /
- groundwater

HTML全文

图 1 FeS胶体对水溶液中As(Ⅴ)的吸附时间曲线

Fig. 1. Time profiles of As (V) adsorption by FeS colloids in aqueous solution

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图 2 FeS胶体对As(Ⅴ)的解吸时间曲线(a)，以及溶液中FeS浓度随时间的变化(b)

Fig. 2. Time profiles of As(Ⅴ) desorption by FeS colloids (a), the change of FeS concentration by time in the solution (b)

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图 3 不同浓度HA对FeS胶体解吸As(Ⅴ)的影响

Fig. 3. Effects of HA on As (V) desorption by FeS colloids

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图 4 不同浓度H₂PO₄^-对FeS胶体解吸As(Ⅴ)的影响(a)，以及对溶液中H₂PO₄^-浓度的变化(b)

Fig. 4. Effects of H₂PO₄^- on As (V) desorption by FeS colloids (a), and the change of H₂PO₄^- concentration in the solution (b)

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图 5 HCO₃^-对FeS胶体解吸As(Ⅴ)的影响

Fig. 5. Effects of HCO₃^- on As (V) desorption by FeS colloids

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