Photodegradation of CI Reactive Red 2 in UV/TiO2-based systems: Effects of ultrasound irradiation

被引：37

作者：

Wu, Chung-Hsin ^{[1
]}

机构：

[1] Da Yeh Univ, Dept Environm Engn, Da Tsuen 515, Chang Hua, Taiwan

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2009年 / 167卷 / 1-3期

关键词：

Ultraviolet (UV); TiO2; Ultrasound (US); Photocatalytic; Sonophotocatalytic; PHOTOCATALYTIC DEGRADATION; SONOCATALYTIC DEGRADATION; AQUEOUS-SOLUTION; AZO DYES; SONOCHEMICAL DECOMPOSITION; OPERATIONAL PARAMETERS; TEXTILE DYES; WATER; TIO2; PERSULFATE;

D O I：

10.1016/j.jhazmat.2008.12.135

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This investigation elucidated the decolorization of C.I. Reactive Red 2 (RR2) in US/TiO2, UV/TiO2 and UV/US/TiO2 systems and evaluated the effect of ultrasound (US) irradiation in photocatalysis. The effects of RR2 concentration, temperature and the addition of NaCl, Na2S2O8 and radical scavenger were determined. The decolorization reactions obeyed the pseudo-first-order kinetics in all tested systems. In US-related systems, the decolorization rate of RR2 declines as RR2 concentration increases. At pH 7, the decolorization rates followed the order UV/US/TiO2 (0.94 h(-1)) > UV/TiO2 (0.85 h(-1)) > US/TiO2 (0.25 h(-1)). The promotion efficiencies of adding NaCl in US/TiO2, UV/TiO2 and UV/US/TiO2 systems were 16%, 18% and 29%, respectively. The decolorization rate increased with the temperature; additionally, the decolorization rate in UV/US/TiO2/Na2S2O8 exceeded that in UV/US/TiO2. The inhibition of RR2 decolorization by adding 1-butanol reveals that the primary decolorization pathway involves hydroxyl radicals, and that direct oxidation by photogenerated holes is probably important in the UV/TiO2-based system. After 120 min of the reaction, the TOC degradation efficiencies of UV/TiO2 and UV/US/TiO2 systems were 47% and 63%, respectively. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：434 / 439

页数：6

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