Large-sized nano-TiO₂/SiO₂ mesoporous nanofilm-constructed macroporous photocatalysts with excellent photocatalytic performance

Abstract

Novel large-sized mesoporous nanofilm-constructed macroporous SiO₂ (LMNCMS) with two sets of well-defined 3D continuous pass-through macropores (pore size of 0.5–1.0 μm, wall thickness of 40–50 nm) was prepared through a dual-templating approach, and used as an advanced support for TiO₂ nanocrystalline photocatalyst. The structural and optical properties of the as-prepared materials were investigated by various characterization techniques in order to explore the connections between catalysts’ features and catalytic performance. The photocatalytic activities were evaluated by degradations of methylene blue (MB) and phenol under the simulated sunlight irradiation. To gain insight into the impact of preparation and operation conditions on photocatalytic degradation processes, experiments were conducted at wide ranges of the TiO₂ loading content, calcination temperature, solution pH, and photocatalyst dosage. Nano-TiO₂/LMNCMS exhibited high photocatalytic activity and stability. Rapid matter transport, good accessibility of pollutants to TiO₂ and high light harvesting could mainly account for the superior photocatalytic performance. The trapping experiments were performed to identify the main reactive species in the catalytic reactions.

Keywords

mesoporous nanofilm / hierarchical porous silica / templating fabrication / nano-TiO₂ / degradation of organic pollutant

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Acknowledgements

This work was financially supported by the Science and Technology Benefiting Projects of Ningbo (Grant No. 2017C50033), the Public Projects of Zhejiang Province (Grant No. LGG19E020002), and the KC Wong Happiness Fund in Ningbo University.

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