4.7 Article

The effects of iron(II) on the kinetics of arsenic oxidation and sorption on manganese oxides

期刊

JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 457, 期 -, 页码 319-328

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.07.022

关键词

Arsenic; Iron; Stirred-flow; Oxidation; Sorption; Kinetics; delta-MnO2

资金

  1. National Science Foundation (NSF) - United States through the Delaware EPSCoR program [EPS0814251]
  2. Institute of Soil and Environmental Quality (ISEQ) Fellowship
  3. Nanjing University
  4. Fundamental Research Funds for the Central Universities [020614330017]

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In this study, As(III) oxidation kinetics by a poorly-crystalline phyllomanganate (delta-MnO2) in the presence and absence of dissolved Fe(II) was investigated using stirred-flow and batch experiments. Chemically synthetic delta-MnO2 was reacted with four influent solutions, containing the same As(III) concentration but different Fe(II) concentrations, at pH 6. The results show an initial rapid As(III) oxidation by delta-MnO2, which is followed by an appreciably slow reaction after 8 h. In the presence of Fe(II), As(III) oxidation is inhibited due to the competitive oxidation of Fe(II) as well as the formation of Fe(III)-(hydr)oxides on the delta-MnO2 surface. However, the sorption of As(III), As(V) and Mn(II) are increased, for the newly formed Fe(III)-(hydr)oxides provide additional sorption sites. This study suggests that the competitive oxidation of Fe(II) and consequently the precipitation of Fe(III) compounds on the delta-MnO2 surface play an important role in As(III) oxidation and As sequestration. Understanding these processes would be helpful in developing in situ strategies for remediation of As-contaminated waters and soils. (C) 2015 Elsevier Inc. All rights reserved.

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