Batch tests were conducted to evaluate the influences of several common dissolved anions in groundwater on the reduction of para-chloronitrobenzene (p-CNB) by zero-valent iron (ZVI). The results showed that p-CNB reduction was enhanced by both Cl− and SO42−. HCO3− could either improve or inhibit p-CNB reduction, depending on whether the mixing speed was intense enough to rapidly eliminate Fe–carbonate complex deposited on ZVI surface. Above a concentration of 100 mg L−1, NO3− increased the p-CNB reduction rate. The reduction rate by ClO4− decreased because the ClO4− competed with p-CNB for electrons. The p-CNB reduction was inhibited by PO43−, SiO32− and humic acid, in the order humic acid < PO43− < SiO32−, since these ions could form inner-sphere complexes on iron surface. The reaction even ceased when the ion concentrations were greater than 4, 0.5, and 30 mg L−1, respectively. The results indicated that common dissolved anions in groundwater should be taken into account when ZVI is applied for contaminated groundwater remediation.
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Research Article|
April 01 2011
Effects of common dissolved anions on the reduction of para-chloronitrobenzene by zero-valent iron in groundwater
C. Le;
1School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China E-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
E-mail: [email protected]
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J. H. Wu;
J. H. Wu
1School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China E-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
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S. B. Deng;
S. B. Deng
2Department of Environmental Science and Engineering, POPs Research Center, Tsinghua University, Beijing 100084, China E-mail: [email protected]
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P. Li;
P. Li
1School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China E-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
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X. D. Wang;
X. D. Wang
1School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China E-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
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N. W. Zhu;
N. W. Zhu
1School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China E-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
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P. X. Wu
P. X. Wu
1School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China E-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
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Water Sci Technol (2011) 63 (7): 1485–1490.
Citation
C. Le, J. H. Wu, S. B. Deng, P. Li, X. D. Wang, N. W. Zhu, P. X. Wu; Effects of common dissolved anions on the reduction of para-chloronitrobenzene by zero-valent iron in groundwater. Water Sci Technol 1 April 2011; 63 (7): 1485–1490. doi: https://doi.org/10.2166/wst.2011.392
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