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
收藏
页码：298 / 305
页数：8
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