Enhanced photocatalytic activity of TiO2 assisted by Nb, N and S multidopants

被引：21

作者：

Ghugal, Sachin G. ^{[1
]}

Umare, Suresh S. ^{[1
]}

Sasikala, Rajamma ^{[2
]}

机构：

[1] Visvesvaraya Natl Inst Technol, Dept Chem, Nagpur 440010, Maharashtra, India

[2] Bhabha Atom Res Ctr Trombay, Div Chem, Bombay 400085, Maharashtra, India

来源：

MATERIALS RESEARCH BULLETIN | 2015年 / 61卷

关键词：

Oxides; Chemical synthesis; Catalytic properties; DOPED TIO2; LIGHT; DEGRADATION; NITROGEN; NANOPARTICLES;

D O I：

10.1016/j.materresbull.2014.10.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A novel visible light active photocatalyst is synthesized by doping TiO2 with multiple dopants like Nb, N and S. TiO2 exists as anatase phase and the particle size is in the range of 10-25 nm. A significant red shift of the absorption edge and increased visible light absorption is shown by multidoped TiO2 compared to undoped TiO2. The tri-doped TiO2 has the highest activity for the photodegradation of methyl orange and the activity shows the order: 0.6NbNS-TiO2 > P25> 0.6Nb-TiO2 > NS-TiO2 > pristine TiO2. The enhanced photocatalytic activity of tri-doped TiO2 is due to the reduction of band gap and enhancement of lifetime of photogenerated charge carriers. This multidoped catalyst is found to be stable and only a marginal decrease in the activity is observed upto 3 cycles. Experiments with quenchers suggest that all super oxide, hydroxyl radicals and photogenerated holes are active species for the oxidation reaction. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：298 / 305

页数：8

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