Highly efficient solar photocatalytic degradation of a textile dye by TiO2/graphene quantum dots nanocomposite

被引：0
|
作者：
Zohreh Niazi
Elaheh K. Goharshadi
Mansour Mashreghi
Majid Namayandeh Jorabchi
机构：
[1] Ferdowsi University of Mashhad,Chemistry Department, Faculty of Science
[2] Ferdowsi University of Mashhad,Nano Research Center
[3] Ferdowsi University of Mashhad,Department of Biology, Faculty of Science
[4] University of Rostock,Institute of Chemistry, Physical and Theoretical Chemistry
来源：
Photochemical & Photobiological Sciences | 2021年 / 20卷
关键词：
Azo dye; Kinetic; Photocatalysis; Mechanism; TiO; /graphene quantum dots nanocomposite;
D O I：
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中图分类号：
学科分类号：
摘要：
Herein, two sunlight responsive photocatalysts including TiO2 nanoparticles (NPs) and TiO2/graphene quantum dots (GQDs) nanocomposite for degrading a textile dye, Reactive Black 5 (RB5), were prepared. The results showed that 100% of 50 ppm RB5 could be degraded by TiO2 NPs and TiO2/GQDs within 60 and 30 min sunlight irradiation, respectively. Hence, much better photocatalytic activity in degradation of RB5 was achieved by TiO2/GQDs under sunlight irradiation compared with pure TiO2 NPs due to its lower band gap (2.13 eV) and electron/hole recombination rate. The photocatalytic degradation mechanism of RB5 by TiO2 NPs was elucidated by adding some scavengers to the solution. The main reactive species contributing to RB5 degradation were surface hydroxyl radicals. The first-order solar degradation rate constant of RB5 for TiO2/GQDs is greater than that of TiO2 NPs under sunlight illumination.
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页码：87 / 99
页数：12
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