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Indexed by: Journal Article

Date of Publication: 2008-01-01

Journal: DYES AND PIGMENTS

Included Journals: EI、SCIE

Volume: 76

Issue: 3

Page Number: 604-609

ISSN: 0143-7208

Key Words: H-acid; degradation; photocatalysis; ozonation; synergistic effect; intermediates

Abstract: The combination of TiO2-assisted photocatalysis and ozonation (TiO2/UV/O-3) to degrade H-acid (1-amino-8-naphthol-3,6-disulfonic acid) was investigated. It was observed that a synergistic effect occurs in this process. The effects of O-3 dosage, initial solution pH and initial concentration of H-acid on the efficiency of the process were also studied. The results showed that COD (chemical oxygen demand) removal rate increased with increasing O-3 dosage whereas initial solution pH had little effect. An H-acid solution of 500-2000 mg/L could be efficiently degraded using TiO2/UV/O-3. The intermediates formed in the early phase of degradation were studied using UV-vis absorption spectra, IC, HPLC-MS and IR; four possible intermediates, 1-amino-5,7,8-trihydroxynaphthalene-3,6-disulfonic acid, 1-amino-2,4,5,8-tetrahydroxynaph-thalene-3,6-disulfonic acid, 8-hydroxy-1,2-naphthoquinone-3,6-disulfonic acid and 8-hydroxy-1,4-naphthoquinone-3,6-disulfonic acid, were proposed. (c) 2006 Elsevier Ltd. All rights reserved.