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Light-assisted decomposition of dyes over iron-bearing soil clays in the presence of H2O2
- Source :
-
Journal of Hazardous Materials . Sep2009, Vol. 168 Issue 2/3, p1246-1252. 7p. - Publication Year :
- 2009
-
Abstract
- Abstract: Four types of soil clays from different sites in China have been chosen to simulate chemical remediation of soils contaminated with dyes by light-assisted Fenton-like method. X-Ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and electron spin resonance (ESR) measurements indicated that these soil clays contain iron oxides such as magnetite and hematite, where nondistorted iron active sites (ESR spectra, g =2.3) predominate. Upon visible or UV irradiation, the soil clays were very effective for the degradation of nonbiodegradable cationic dyes such as Rhodamine B (RhB) by activating H2O2 at neutral pH. The photodegradation rates of RhB were closely related to total Fe content in clays and H2O2 dosage, indicating the mineral-catalyzed Fenton-like reactions operated. Soil organic matters (SOM) would remarkably inhibit the photodecomposition of RhB dye. The reaction products were some low-molecular-weight dicarboxylic acids and their derivatives, all of which are easily biodegradable. A possible mechanism was proposed based on the results obtained by spin-trapping ESR technique. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 168
- Issue :
- 2/3
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 42966156
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2009.02.160