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Hydrolytic Modification of SiO2 Microspheres with Na2SiO3 and the Performance of Supported Nano-TiO2 Composite Photocatalyst.

Authors
  • Tu, Yu1
  • Ao, Weihua1
  • Wang, Chunhong2
  • Ren, Tianyu1
  • Zhang, Lijuan1
  • Zhong, Jiaxin1
  • Li, Wei3
  • Ding, Hao1
  • 1 Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, China. , (China)
  • 2 Jiaozuo Weina Technology Co., Ltd., Jiaozuo 454100, China. , (China)
  • 3 Beijing Building Materials Academy of Sciences Research Co., Ltd., Shixing Street, Shijingshan District, Beijing 100041, China. , (China)
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
May 14, 2021
Volume
14
Issue
10
Identifiers
DOI: 10.3390/ma14102553
PMID: 34069143
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Modified microspheres (SiO2-M) were obtained by the hydrolytic modification of silicon dioxide (SiO2) microspheres with Na2SiO3, and then, SiO2-M was used as a carrier to prepare a composite photocatalyst (SiO2-M/TiO2) using the sol-gel method; i.e., nano-TiO2 was loaded on the surface of SiO2-M. The structure, morphology, and photocatalytic properties of SiO2-M/TiO2 were investigated. Besides, the mechanism of the effect of SiO2-M was also explored. The results show that the hydrolytic modification of Na2SiO3 coated the surface of SiO2 microspheres with an amorphous SiO2 shell layer and increased the quantity of hydroxyl groups. The photocatalytic performance of the composite photocatalyst was slightly better than that of pure nano-TiO2 and significantly better than that of the composite photocatalyst supported by unmodified SiO2. Thus, increasing the loading capacity of nano-TiO2, improving the dispersion of TiO2, and increasing the active surface sites are essential factors for improving the functional efficiency of nano-TiO2. This work provides a new concept for the design of composite photocatalysts by optimizing the performance of the carrier.

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