Enhanced photocatalytic degradation of methylene blue under vacuum ultraviolet irradiation

被引：66

作者：

Huang, Haibao ^{[1
,2
]}

Leung, Dennis Y. C. ^{[1
]}

Kwong, Philip C. W. ^{[3
]}

Xiong, Jing ^{[1
]}

Zhang, Lu ^{[2
]}

机构：

[1] Univ Hong Kong, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China

[2] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou, Guangdong, Peoples R China

[3] Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia

来源：

CATALYSIS TODAY | 2013年 / 201卷

关键词：

Photocatalytic degradation; Photolysis; Vacuum ultraviolet irradiation; Methylene blue; Mineralization; NM UV-LIGHT; AQUEOUS-SOLUTION; AZO DYES; TIO2; PHOTODEGRADATION; SURFACE; WATER; OXIDATION;

D O I：

10.1016/j.cattod.2012.06.022

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A vacuum ultraviolet (VUV) lamp was used as the irradiation of photocatalysis to enhance the degradation of methylene blue (MB), a model dye compound. In contrast to photocatalysis under 254 nm UV irradiation (UV/TiO2), photocatalysis under VUV irradiation (VUV/TiO2) exhibited much higher efficiency in MB degradation and mineralization and needed less TiO2 dosage. The rate constant of MB degradation in VUV/TiO2 (0.0793 min(-1)) is about 4 times of that of UV/TiO2 (0.0205 min(-1)). The MB mineralization rate is also greatly increased from 12.5% in UV/TiO2 to 47.7% in VUV/TiO2 after 60 min of irradiation. Multiple advanced oxidation processes including photocatalytic oxidation and VUV photo-oxidation coexist in VUV/TiO2 to substantially produce highly reactive species (such as (OH)-O-center dot and energetic photons), which is responsible for efficient degradation and mineralization of MB. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：189 / 194

页数：6

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