Kinetics and mechanism of chlorinated aniline degradation by TiO2 photocatalysis

被引:29
|
作者
Nitoi, Ines
Oancea, Petruta [1 ]
Cristea, Ionut
Constsntin, Lucian [2 ]
Nechifor, Gheorghe [2 ]
机构
[1] ECOIND, Natl Res & Dev Inst Ind Ecol, Bucharest, Romania
[2] Univ Politeh Bucharest, Fac Appl Chem & Mat Sci, Bucharest, Romania
关键词
O-CHLOROANILINE; 2-CHLOROANILINE; SUSPENSIONS; PESTICIDES; DICHLORVOS; OXIDATION; LIGHT;
D O I
10.1016/j.jphotochem.2014.10.005
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photooxidation of 4-chloroanaline (4-CLA) in UV/TiO2/H2O2 system was investigated in the following working conditions: pH 4; [TiO2] = 50-500 mg/L; [H2O2] = (0.1-10) x 10(-3) M; tau(irr) = 5-180 min A pollutant degradation pathway by four possible routes was proposed, according to organic intermediates identified by gas-chromatography coupled with mass spectrometry-screening method. Based on experimental results can be concluded that after 90 min of irradiation, 4-CLA was completely degraded in the presence of H2O2 (1 x 10(-3) M). Mineralization yields of organic chlorine and nitrogen were >= 88% for prolonged irradiation time (180 min). These results are consistent with the proposed degradation pathway that presents as intermediates, aromatic compounds like 4-chlorophenol, 4-aminophenol, 4-chloronitrobenzene, and aniline. The presence of these intermediates in irradiated samples is also supported by 82.4% TOC removal yield obtained at prolonged irradiation time. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:17 / 23
页数:7
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