Enhanced photocatalytic degradation of atrazine by platinized titanium dioxide under 352 nm irradiation

被引:13
作者
Chen, Shen-Ming [1 ]
Lu, Norman [2 ]
Chen, Jun-Yu [2 ]
Yang, Cheng-Yu [1 ]
Yeh, Yun-Peng [2 ]
Feng, Tsung-Yao [2 ]
Shih, Yang-hsin [3 ]
Kokulnathan, Thangavelu [1 ]
Chen, Dong [4 ]
机构
[1] Natl Taipei Univ Technol, Dept Chem Engn & Biotechnol, Taipei 106, Taiwan
[2] Natl Taipei Univ Technol, Inst Organ & Polymer Mat, Taipei, Taiwan
[3] Natl Taiwan Univ, Dept Agr Chem, Taipei, Taiwan
[4] Indiana Univ Purdue Univ, Dept Civil & Mech Engn, 2101 E Coliseum Blvd, Ft Wayne, IN 46805 USA
关键词
352; nm; atrazine; hydroxyl radical; platinized TiO2; Schottky barrier effect; ORGANIC POLLUTANTS; TIO2; LIGHT; OXIDATION; WATER; ACID; UV; MINERALIZATION; MECHANISMS; REDUCTION;
D O I
10.2166/wst.2016.593
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Simply coating 1 wt.% of platinum on titanium dioxide (TiO2) surface resulted in simple preparation of platinized TiO2 (Pt-TiO2). This study demonstrated the photodegradation of atrazine (ATZ) using either Pt-TiO2 or TiO2 as a photocatalyst under 352 nm light irradiation. The Pt-TiO2-catalyzed ATZ degradation reached 76% in 3 hours without adding H2O2 solution or aeration, which was more than 10% higher than the TiO2-catalyzed reaction. The decomposition product of Pt-TiO2-catalyzed ATZ degradation was mainly cyanuric acid. Thus, Pt-TiO2 as an effective photocatalyst has three main advantages in the photodegradation of ATZ under 352 nm irradiation. First, the coated Pt can facilitate the generation of appropriate amounts of OH radicals, so it can prevent the formation of over-oxidized TiO2. Second, aeration was not needed. Third, the excited electrons were mainly uni-directionally transferred to the catalyst surface to avoid recombination of electron-hole pairs.
引用
收藏
页码:1128 / 1137
页数:10
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