Microwave assisted rapid and complete degradation of atrazine using TiO2 nanotube photocatalyst suspensions

被引:82
|
作者
Gao Zhanqi [1 ]
Yang Shaogui [1 ]
Na, Ta [1 ]
Sun Cheng [1 ]
机构
[1] Nanjing Univ, State Key Lab Pollut Control & Resources, Sch Environm, Nanjing 210093, Peoples R China
基金
中国博士后科学基金;
关键词
atrazine; nanotubes; microwave; photocatalysis; ENVIRONMENTAL REMEDIATION; AQUEOUS-SOLUTION; ILLUMINATION METHOD; RHODAMINE-B; IRRADIATION; OXIDATION; PHOTODEGRADATION; 4-CHLOROPHENOL; POLLUTANTS; KINETICS;
D O I
10.1016/j.jhazmat.2006.11.042
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A technology, microwave-assisted photocatalysis on TiO2 nanotubes, which can be applied to degrade atrazine rapidly and completely, was investigated. TiO2 nanotubes were prepared, and confirmed by XRD, TEM and ESR. Microwave-assisted photocatalytic degradation of atrazine in aqueous solution was investigated. The result indicates that atrazine is completely degraded in 5 min and the mineralization efficiency is 98.5% in 20 min, which is obviously more efficient than that by the traditional photocatalytic degradation methods. It may be attributed to the intense UV radiation generated by electrodeless discharge lamps under microwave irradiation, the increased number of (OH)-O-center dot, additional defect sites on Ti02 under the irradiation of microwave and larger specific surface area of TiO2 nanoturbes which could adsorb more organic substances to degrade than TiO2 nanoparticles. Along with the degradation of atrazine, the concentrations of Cl- and NO3 increase gradually. In 20 min [CI-] and [NO3-] are 3, 27.8 mg/L, respectively, which are close to their stoichiometric values. The major intermediates of atrazine were identified by HPLC/MS and possible degradation pathways of atrazine in microwave-assisted photocatalysis on TiO2 nanotubes were proposed. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:424 / 430
页数:7
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