Principles and mechanisms of photocatalytic dye degradation on TiO2 based photocatalysts: a comparative overview

被引:1147
作者
Ajmal, Anila [1 ]
Majeed, Imran [2 ]
Malik, Riffat Naseem [1 ]
Idriss, Hicham [3 ]
Nadeem, Muhammad Amtiaz [1 ,3 ]
机构
[1] Quaid I Azam Univ, Dept Environm Sci, Islamabad 4200, Pakistan
[2] Quaid I Azam Univ, Dept Chem, Islamabad 4200, Pakistan
[3] Saudi Basic Ind Corp, CRI KAUST, Thuwal, Saudi Arabia
关键词
N-DOPED TIO2; EXPOSED; 001; FACETS; TITANIUM-DIOXIDE NANOPARTICLES; ADVANCED OXIDATION PROCESSES; AQUEOUS-ORGANIC POLLUTANTS; REACTIVE DYEBATH EFFLUENT; ZINC-OXIDE NANOPARTICLES; TEXTILE WASTE-WATER; ACID ORANGE 7; VISIBLE-LIGHT;
D O I
10.1039/c4ra06658h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The total annual production of synthetic dye is more than 7 x 10(5) tons. Annually, through only textile waste effluents, around one thousand tons of non-biodegradable textile dyes are discharged into natural streams and water bodies. Therefore, with growing environmental concerns and environmental awareness there is a need for the removal of dyes from local and industrial water effluents with a cost effective technology. In general, these dyes have been found to be resistant to biological as well as physical treatment technologies. In this regard, heterogeneous advanced oxidation processes (AOPs), involving photo-catalyzed degradation of dyes using semiconductor nanoparticles is considered as an efficient cure for dye pollution. In the last two decades TiO2 has received considerable interest because of its high potential as a photocatalyst to degrade a wide range of organic material including dyes. This review starts with (i) a brief overview on dye pollution, dye classification and dye decolourization/degradation strategies; (ii) focuses on the mechanisms involved in comparatively well understood TiO2 photocatalysts and (iii) discusses recent advancements to enhance TiO2 photocatalytic efficiency by (a) doping with metals, non-metals, transition metals, noble metals and lanthanide ions, (b) structural modifications of TiO2 and (c) immobilization of TiO2 by using various supports to make it a flexible and cost-effective commercial dye treatment technology.
引用
收藏
页码:37003 / 37026
页数:24
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