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

Research output: Contribution to journalArticle

12 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 languageEnglish
Pages (from-to)374-380
Number of pages7
JournalJournal of Hazardous Materials
Volume156
Issue number1-3
DOIs
Publication statusPublished - 2008 Aug 15

Fingerprint

Anions
anion
Negative ions
Ions
ion
Photolysis
photolysis
chlorite
irradiation
Wastewater
Waste Water
chromium hexavalent ion
Irradiation
wastewater

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

Cite this

Influence of inorganic anion on Cr(VI) photo-reduction in the presence of ferric ion. / Tzou, Yu Min; Hsu, Chia Lian; Chen, Chung-Chi; Chen, Jen Hshuan; Wu, Jeng Jzung; Tseng, Kuo Jin.

In: Journal of Hazardous Materials, Vol. 156, No. 1-3, 15.08.2008, p. 374-380.

Research output: Contribution to journalArticle

Tzou, Yu Min ; Hsu, Chia Lian ; Chen, Chung-Chi ; Chen, Jen Hshuan ; Wu, Jeng Jzung ; Tseng, Kuo Jin. / Influence of inorganic anion on Cr(VI) photo-reduction in the presence of ferric ion. In: Journal of Hazardous Materials. 2008 ; Vol. 156, No. 1-3. pp. 374-380.
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