Coal-based graphene as a promoter of TiO<sub>2</sub> catalytic activity for the photocatalytic degradation of organic dyes

LIU Guo-yang; LI Ke-ke; JIA Jia; ZHANG Ya-ting

doi:10.1016/S1872-5805(21)60047-1

Volume 37 Issue 6

Nov. 2022

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Article Navigation > New Carbon Mater. > 2022 > 37(6): 1172-1182

LIU Guo-yang, LI Ke-ke, JIA Jia, ZHANG Ya-ting. Coal-based graphene as a promoter of TiO2 catalytic activity for the photocatalytic degradation of organic dyes. New Carbon Mater., 2022, 37(6): 1172-1182. doi: 10.1016/S1872-5805(21)60047-1

Citation:

LIU Guo-yang, LI Ke-ke, JIA Jia, ZHANG Ya-ting. Coal-based graphene as a promoter of TiO₂ catalytic activity for the photocatalytic degradation of organic dyes. New Carbon Mater., 2022, 37(6): 1172-1182. doi: 10.1016/S1872-5805(21)60047-1

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Coal-based graphene as a promoter of TiO₂ catalytic activity for the photocatalytic degradation of organic dyes

doi: 10.1016/S1872-5805(21)60047-1

LIU Guo-yang^{1, 2
,},
LI Ke-ke¹,
JIA Jia¹,
ZHANG Ya-ting^{1
,
,}

1.
College of chemistry and chemical engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2.
National Engineering Research Center of Coal Preparation and Purification, China University of Mining & Technology, Xuzhou 221116, China

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Author Bio:
刘国阳，讲师. E-mail：liuguoyangxust@126.com
Corresponding author: ZHANG Ya-ting, Professor. E-mail: isyating@163.com
Received Date: 2020-10-30
Rev Recd Date: 2020-12-12

Available Online: 2021-02-05

Publish Date: 2022-11-28

Abstract

Abstract

Graphene oxide (GO) obtained from coal-based graphite by the Hummers method was hydrothermally treated to obtain reduced GO (rGO). TiO₂ was mixed with aqueous suspensions of GO and rGO and dried at 70 ^oC to obtain GO-TiO₂ and rGO-TiO₂ with 95% (mass fraction) TiO₂. TiO₂ was also combined with a GO suspension by hydrothermal treatment to obtain rGO-hTiO₂ with 95% TiO₂. The three hybrids were used as catalysts for the photocatalytic degradation of rhodamine B (Rh B) and methyl orange (MO). Of the three materials, rGO-hTiO₂ had the highest catalytic activity for the degradation of Rh B and MO under visible light irradiation. The reasons for having the best catalytic activity are that the incorporation of rGO into TiO₂ helps increase its adsorption capacities for Rh B and MO as evidenced by adsorption in dark, and a narrowing of the TiO₂ band gap as revealed by diffuse UV reflectance spectroscopy. This reduces the rate of recombination of electron–hole pairs by there being intimate contact between the TiO₂ particles and rGO, forming Ti-O-C bonds as confirmed by XPS, with the TiO₂ particles being uniformly decorated on the rGO sheets.
- Coal-based graphene,
- Hydrothermal method,
- Photocatalytic degradation,
- Titanium dioxide

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References(33)

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