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

Volume 41 Issue 2

Feb. 2016

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Cheng Dong, Liao Peng, Yuan Songhu, 2016. Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron. Earth Science, 41(2): 325-330. doi: 10.3799/dqkx.2016.024

Citation:

Cheng Dong, Liao Peng, Yuan Songhu, 2016. Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron. Earth Science, 41(2): 325-330. doi: 10.3799/dqkx.2016.024

Cheng Dong, Liao Peng, Yuan Songhu, 2016. Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron. Earth Science, 41(2): 325-330. doi: 10.3799/dqkx.2016.024

Citation:

Cheng Dong, Liao Peng, Yuan Songhu, 2016. Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron. Earth Science, 41(2): 325-330. doi: 10.3799/dqkx.2016.024

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

doi: 10.3799/dqkx.2016.024

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

Received Date: 2015-08-30
Publish Date: 2016-02-15

Abstract

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

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References(28)

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