Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 186, Issue 2-3, Pages 2110-2116Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.12.127
Keywords
Cr(III)-tartrate complex; Species analysis; Photooxidation; Hydroxyl radical
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Funding
- National Natural Science Foundation of China [40671089, 40930738]
- NSF [CBET-0853950]
- Division Of Earth Sciences
- Directorate For Geosciences [0843996] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0853950] Funding Source: National Science Foundation
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In the present study, exposure of Cr(III)-tar to full light of medium pressure mercury lamps and a xenon lamp was conducted in batch reaction systems at 25 degrees C and different pH values to predict the potential for Cr(III) oxidation. The results indicated that the more intense irradiation and higher pH facilitated Cr(III)-tar oxidation. It appears that a ligand-to-metal charge-transfer occurs for Cr(III)-tar after irradiation, leading to the generation of Cr(II) and tar(center dot) or (OH)-O-center dot. The accompanying photochemical decomposition of tar(center dot)/or tar, together with O-2, further caused the formation of (OH)-O-center dot through multiple pathways, which ultimately converted Cr(II) to Cr(VI) step by step. H2O2, a direct source of (OH)-O-center dot under irradiation, significantly enhanced photooxidation of Cr(III)-tar. but not obviously of aqueous Cr(III) or Cr(III)-tar in dark, implying that Cr(II) acts as a precursor of Cr(III) oxidization to Cr(VI). (C) 2011 Elsevier B.V. All rights reserved.
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