Preparation of graphdiyne-doped TiO 2 /SiO 2 composite for enhanced photocatalytic activity
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RESEARCH PAPER
Preparation of graphdiyne-doped TiO2/SiO2 composite for enhanced photocatalytic activity Xiang Yu & Liu Jiajun & Yu Xianglin & Zhu Feng & Li Yongjun & Li Junbo
Received: 27 June 2020 / Accepted: 24 November 2020 # Springer Nature B.V. 2020
Abstract Enhancing the efficiency of visible light degradation is important for the actual application of TiO2/ SiO2 (Ti/Si) composite materials for waste water treatment. In this manuscript, graphdiyne-doped TiO2/SiO2 (Ti/Si/GDY) (the Ti/Si composite exhibits a spherical shape with a diameter between 200 and 500 nm) composite material was successfully prepared using a hydrothermal method, which was utilized as photocatalyst for the photocatalytic degradation of methylene blue (MB) in aqueous solution under visible light illumination. Studies showed that Ti/Si/GDY-0.8 wt% exhibited superior photocatalytic degradation efficiency (91.8%) under visible light illumination than other composite materials such as Ti/Si/GDY-0.6 wt% (87.9%), Ti/Si/ GDY-1.0 wt% (85.9%), and bare Ti/Si composite (32.3%). Moreover, Ti/Si/GDY also showed a higher photocatalytic degradation efficiency than other carbon materials (graphene (GR) and carbon nanotube (CNT) X. Yu : L. Junbo (*) School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430074, China e-mail: [email protected] L. Jiajun : Y. Xianglin (*) : Z. Feng Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430074, China e-mail: [email protected] L. Yongjun Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
composited Ti/Si (Ti/Si/GR, Ti/Si/CNT)). The studies of the possible mechanism for the degradation of MA indicated that h+ was the major substance for the smooth degradation of methylene blue. Such a high efficiency photocatalyst might be also useful for the degradation of other contaminates in waste water or air. Keywords Graphdiyne . TiO2/SiO2 . Photocatalyst . Methylene blue . Visible light degradation . Nanostructured catalysts
Introduction Recently, semiconductor photocatalysts have been widely investigated in environmental science especially in waste water treatment and energy transformation (Wu et al. 2007; Liu 2012; Kozlova and Parmon 2017; Yu et al. 2018). Among the various semiconductor photocatalysts, titanium dioxide (TiO2) has been extensively investigated because of its high catalytic activity, photostability, and feasible availability (Pang et al. 2014; Yang et al. 2013). TiO2 photocatalytic oxidation technology has the characteristics of mild reaction condition, simple operation, and no secondary pollution. It is widely used in sewage treatment and air purification, is antibacterial, and has become an ideal green treatment technology for environmental issues (Xiao et al. 2010). However, many obstacles such as low adsorption ability, detrimental recombination of charge carriers, and light utilization impede t
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