Influence of inorganic anion on Cr(VI) photo-reduction in the presence of ferric ion

Yu Min Tzou; Chia Lian Hsu; Chung Chi Chen; Jen Hshuan Chen; Jeng Jzung Wu; Kuo Jin Tseng

doi:10.1016/j.jhazmat.2007.12.028

Influence of inorganic anion on Cr(VI) photo-reduction in the presence of ferric ion

Yu Min Tzou^*, Chia Lian Hsu, Chung Chi Chen, Jen Hshuan Chen, Jeng Jzung Wu, Kuo Jin Tseng

^*Corresponding author for this work

Department of Life Science

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Photo-reduction of Cr(VI) in a solution with single or multi-inorganic anions was evaluated. The results show that 38.5 μM Cr(VI) is photo-reduced in the presence of NO₃^- at pH 1. The photolysis of NO₃^-, producing NO₂^- or H₂O₂, may contribute to Cr(VI) reduction. The addition of 0.001-0.1 M chlorite to NO₃^- enhanced Cr(VI) photo-reduction when 35.8 μM Fe(III) was present. This enhancement was the combinative result of photolysis of NO₃^- and Fe-Cl complexes, leading to the formation of NO₂^- and Fe(II), respectively, for Cr(VI) reduction. On the contrary, a significant decrease in Cr(VI) photo-reduction was observed with the addition of PO₄^3- and SO₄^2-. This decrease was due to their strong competition with Fe(III) from Cl^-, resulting in a marked decrease in the concentrations of Fe-Cl complexes. The results suggest that a direct irradiation of acidic wastewaters containing Cl^-, NO₃^-, and Fe(III) is a feasible strategy for eliminating Cr(VI).

Original language	English
Pages (from-to)	374-380
Number of pages	7
Journal	Journal of Hazardous Materials
Volume	156
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jhazmat.2007.12.028
Publication status	Published - 2008 Aug 15

Keywords

Fe-Cl complex
Inorganic anion
Photolytic reaction

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution
Health, Toxicology and Mutagenesis

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10.1016/j.jhazmat.2007.12.028

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title = "Influence of inorganic anion on Cr(VI) photo-reduction in the presence of ferric ion",

abstract = "Photo-reduction of Cr(VI) in a solution with single or multi-inorganic anions was evaluated. The results show that 38.5 μM Cr(VI) is photo-reduced in the presence of NO3- at pH 1. The photolysis of NO3-, producing NO2- or H2O2, may contribute to Cr(VI) reduction. The addition of 0.001-0.1 M chlorite to NO3- enhanced Cr(VI) photo-reduction when 35.8 μM Fe(III) was present. This enhancement was the combinative result of photolysis of NO3- and Fe-Cl complexes, leading to the formation of NO2- and Fe(II), respectively, for Cr(VI) reduction. On the contrary, a significant decrease in Cr(VI) photo-reduction was observed with the addition of PO43- and SO42-. This decrease was due to their strong competition with Fe(III) from Cl-, resulting in a marked decrease in the concentrations of Fe-Cl complexes. The results suggest that a direct irradiation of acidic wastewaters containing Cl-, NO3-, and Fe(III) is a feasible strategy for eliminating Cr(VI).",

keywords = "Fe-Cl complex, Inorganic anion, Photolytic reaction",

author = "Tzou, {Yu Min} and Hsu, {Chia Lian} and Chen, {Chung Chi} and Chen, {Jen Hshuan} and Wu, {Jeng Jzung} and Tseng, {Kuo Jin}",

note = "Funding Information: This work was supported financially by the National Science Council, ROC under Project No. 95-2313-B-005-047-MY3 and, in part, by the Ministry of Education, ROC under the ATU plan.",

year = "2008",

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doi = "10.1016/j.jhazmat.2007.12.028",

language = "English",

volume = "156",

pages = "374--380",

journal = "Journal of Hazardous Materials",

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T1 - Influence of inorganic anion on Cr(VI) photo-reduction in the presence of ferric ion

AU - Tzou, Yu Min

AU - Hsu, Chia Lian

AU - Chen, Chung Chi

AU - Chen, Jen Hshuan

AU - Wu, Jeng Jzung

AU - Tseng, Kuo Jin

N1 - Funding Information: This work was supported financially by the National Science Council, ROC under Project No. 95-2313-B-005-047-MY3 and, in part, by the Ministry of Education, ROC under the ATU plan.

PY - 2008/8/15

Y1 - 2008/8/15

N2 - Photo-reduction of Cr(VI) in a solution with single or multi-inorganic anions was evaluated. The results show that 38.5 μM Cr(VI) is photo-reduced in the presence of NO3- at pH 1. The photolysis of NO3-, producing NO2- or H2O2, may contribute to Cr(VI) reduction. The addition of 0.001-0.1 M chlorite to NO3- enhanced Cr(VI) photo-reduction when 35.8 μM Fe(III) was present. This enhancement was the combinative result of photolysis of NO3- and Fe-Cl complexes, leading to the formation of NO2- and Fe(II), respectively, for Cr(VI) reduction. On the contrary, a significant decrease in Cr(VI) photo-reduction was observed with the addition of PO43- and SO42-. This decrease was due to their strong competition with Fe(III) from Cl-, resulting in a marked decrease in the concentrations of Fe-Cl complexes. The results suggest that a direct irradiation of acidic wastewaters containing Cl-, NO3-, and Fe(III) is a feasible strategy for eliminating Cr(VI).

AB - Photo-reduction of Cr(VI) in a solution with single or multi-inorganic anions was evaluated. The results show that 38.5 μM Cr(VI) is photo-reduced in the presence of NO3- at pH 1. The photolysis of NO3-, producing NO2- or H2O2, may contribute to Cr(VI) reduction. The addition of 0.001-0.1 M chlorite to NO3- enhanced Cr(VI) photo-reduction when 35.8 μM Fe(III) was present. This enhancement was the combinative result of photolysis of NO3- and Fe-Cl complexes, leading to the formation of NO2- and Fe(II), respectively, for Cr(VI) reduction. On the contrary, a significant decrease in Cr(VI) photo-reduction was observed with the addition of PO43- and SO42-. This decrease was due to their strong competition with Fe(III) from Cl-, resulting in a marked decrease in the concentrations of Fe-Cl complexes. The results suggest that a direct irradiation of acidic wastewaters containing Cl-, NO3-, and Fe(III) is a feasible strategy for eliminating Cr(VI).

KW - Fe-Cl complex

KW - Inorganic anion

KW - Photolytic reaction

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Influence of inorganic anion on Cr(VI) photo-reduction in the presence of ferric ion

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Keywords

ASJC Scopus subject areas

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