Photocatalytic mineralisation of herbicide 2,4,5-trichlorophenoxyacetic acid: enhanced performance by triple junction Cu-TiO2-Cu2O and the underlying reaction mechanism

被引：47

作者：

An, Xiaoqiang ^{[1
,2
]}

Liu, Huijuan ^{[2
]}

Qu, Jiuhui ^{[2
]}

Moniz, Savio J. A. ^{[1
]}

Tang, Junwang ^{[1
]}

机构：

[1] UCL, Dept Chem Engn, London WC1E 7JE, England

[2] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China

来源：

NEW JOURNAL OF CHEMISTRY | 2015年 / 39卷 / 01期

关键词：

PHOTO-ASSISTED DEGRADATION; ONE-POT SYNTHESIS; NANOWIRE ARRAYS; CARBON-DIOXIDE; TIO2; OXIDE; WATER; CU; REDUCTION; HYBRID;

D O I：

10.1039/c4nj01317d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A mild and facile photodeposition method was used to fabricate novel Cu-TiO2-Cu2O composite photocatalysts. Due to the in situ rectifying charge carrier separation and enhanced conductivity, the composites present superior photocatalytic activity, leading to more than 90% mineralisation of the toxic 2,4,5-trichlorophenoxyacetic acid herbicide. This result was confirmed by both TOC and UV-vis absorption measurements. The effect of active radicals on the photodegradation of the herbicide was further investigated in order to clarify the underlying mechanism, based on which a hole-dominated photooxidation mechanism was proposed. These results not only offer a green and economical method for constructing triple junction photocatalyst materials, but also shed new insight on the rational design of a low cost and high-efficiency photocatalyst for environmental remediation.

引用

页码：314 / 320

页数：7

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