Elucidation of the photocatalytic degradation mechanism of an azo dye under visible light in the presence of cobalt doped TiO2 nanomaterials

Chemosphere ◽  
2021 ◽  
Vol 266 ◽  
pp. 128931
Author(s):  
Abderrahim El Mragui ◽  
Omar Zegaoui ◽  
Joaquim C.G. Esteves da Silva
2012 ◽  
Vol 217-219 ◽  
pp. 853-856 ◽  
Author(s):  
Han Jie Huang ◽  
Wen Long She ◽  
Ling Wen Yang

In this paper, CeVO4/TiO2 composite photocatalyst has been characterized by photoelectrochemical and reactive oxygen species trap techniques to reveal the mechanism for photocatalytic degradation of VOCs in gas-phase. Based on the measurement of flatband of the samples and the detection of reactive oxygen species, a visible light-induced photocatalytic degradation mechanism of VOCs on CeVO4/TiO2 is proposed.


NANO ◽  
2019 ◽  
Vol 14 (09) ◽  
pp. 1950112
Author(s):  
Mengzhu Qiao ◽  
Hongjin Liu ◽  
Jun Lv ◽  
Guangqing Xu ◽  
Xinyi Zhang ◽  
...  

The BiOI homojunctions were constructed between BiOI nanosheets and BiOI nanoflowers, which were prepared with a facile ultrasound-assisted solvothermal method. BiOI nanosheets were uniformly distributed on BiOI nanoflowers surface. The homojunction structure constructed between nanosheets and nanoflowers efficiently speeds up the transfer and separation of photoinduced charge carriers, which is beneficial to promote the photocatalytic activity. Compared with single BiOI, BiOI homojunctions exhibit remarkably improved photocatalytic degradation activity for tetracycline hydrochloride (TC); photodegradation rate of 69.43% for TC has been reached after being irradiated under visible light for 1[Formula: see text]h. Deeper analyses of photocatalytic degradation mechanism of TC have been conducted; the results identify that [Formula: see text] and h[Formula: see text] play important roles during the TC degradation reaction.


2016 ◽  
Vol 13 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Rani P. Barkul ◽  
Farah-Naaz A. Shaikh ◽  
Sagar D. Delekar ◽  
Meghshyam K. Patil

2021 ◽  
Author(s):  
Tongtong Zhang ◽  
Qi Yin ◽  
Menghan Zhang ◽  
Siyu Zhang ◽  
Yanning Shao ◽  
...  

Abstract A series of rGO/AgBr heterojunction photocatalysts were fabricated through a facile solvothermal method. The rGO/AgBr heterostructures were characterized by XPS, XRD, UV-Vis DRS, SEM, TEM, PL and the transient photocurrent responses. The XRD, SEM, XPS and TEM analyzes indicated that the graphene and silver bromide were successfully compounded without other impurities. The UV-Vis DRS exhibited that the composites have better optical properties than pure silver bromide. The PL and the transient photocurrent responses demonstrated that the addition of graphene significantly promotes the separation of photogenerated electrons and holes. Subsequently, the photocatalytic activities of rGO/AgBr composites were studied by degrading Rhodamine B (RhB). It turned out that the degradation rate of RhB by the rGO/AgBr heterojunction photocatalysts were significantly higher than that by pure AgBr. What’s more, to study the photocatalytic degradation mechanism of RhB by rGO/AgBr heterostructures, the trapping experiments were used to identify the main active components. This work confirmed that the photocatalytic degradation performance of the catalyst was greatly improved after doping graphene, which provided certain data support for degradation of organic contaminants in water.


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