Preparation and Performance of Graphite/TiO2 Composite Photocatalyst

doi:10.11901/1005.3093.2020.388

Chinese Journal of Materials Research

2021, Vol. 35

Issue (9): 703-711 DOI: 10.11901/1005.3093.2020.388

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Preparation and Performance of Graphite/TiO₂ Composite Photocatalyst

HOU Jing¹^,², YANG Peizhi¹(

), ZHENG Qinhong¹, YANG Wen¹, ZHOU Qihang¹, LI Xueming¹

^1.Key Laboratory of Renewable Energy Advanced and Manufacturing Technology, Ministry of Education, Yunnan Normal University, Kunming 650500, China
^2.Panzhihua University, Panzhihua 617000, China

Cite this article:

HOU Jing, YANG Peizhi, ZHENG Qinhong, YANG Wen, ZHOU Qihang, LI Xueming. Preparation and Performance of Graphite/TiO₂ Composite Photocatalyst. Chinese Journal of Materials Research, 2021, 35(9): 703-711.

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Abstract

The composite photocatalyst of graphite/TiO₂ was prepared by high-energy ball milling with graphite and pure TiO₂ as the raw materials. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and ultraviolet diffuse reflectance (DRS). The effect of graphite addition and ball milling time on the photocatalytic activity of the prepared composite photocatalyst was investigated by comparison of their degradation efficiencies for the methyl orange as the simulated pollutant. The results show that after ball milling the graphite/TiO₂ composite photocatalyst presents an anatase-like X-ray diffraction pattern, the diffraction peak of TiO₂(101) plane widened and shifted to the right, the TiO₂ particles are irregular spherical around 200 nm, and the graphite uniformly distributed on the TiO₂ surface. Because of higher binding energy of TiO₂ grains, the defects generated on the surface of the graphite doped TiO₂ have significant absorption capacity in the visible light region. The graphite/TiO₂ composite photocatalyst with 5 mass% graphite prepared by ball milling for 12 h showed the best photocatalytic degradation effect of methyl orange. After the degradation time of 70 min the degradation removal rate of methyl orange could reach 95.08%, and the reaction rate constant k was 0.043035 min^-1, which was 2.64 times that of the pure TiO₂.

Key words: composites graphite/TiO₂ methyl orange photocatalysis ball milling

Received: 14 September 2020

ZTFLH:

O643

Fund: National Natural Science Foundation of China(U1802257);Yunnan Provincial Science Foundation(2017FA024);Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province, Seed Funding Project of Panzhihua University Science and Technology Park

About author: YANG Peizhi, Tel: 13888912788, E-mail: pzhyang@hotmail.com

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	Jing HOU
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	Xueming LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.388 OR https://www.cjmr.org/EN/Y2021/V35/I9/703

Fig.1 XRD patterns of graphite/TiO₂ composite photocatalysts with different graphite contents

Fig.2 XRD pattern of 5% graphite/TiO₂ composite photocatalyst with different ball milling time

Fig.3 SEM image of graphite/TiO₂ composite photocatalyst with different ball milling time

Fig.4 SEM image of graphite/TiO₂ composite photocatalysts with different graphite contents

Fig.5 EDS analysis and element distribution of 5% graphite/TiO₂ composite photocatalyst

Fig.6 TEM and HRTEM spectra of 5% grphite/TiO₂ composite photocatalyst

Fig.7 XPS spectra of 5% grphite/TiO₂ composite photocatalyst

Fig.8 UV-Vis absorption spectrum of graphite/TiO₂ composite photocatalyst

Fig.9 Adsorption and photocatalytic degradation of methyl orange by graphite/TiO₂ composite photocatalysts with different graphite doping contents

Fig.10 Adsorption and photocatalytic degradation of methyl orange by graphite/TiO₂ composite photocatalysts with different ball milling time

Fig.11 Schematic for photocatalytic performance of graphite/ TiO₂ composite photocatalyst

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