Mechanistic insights into the selective photocatalytic degradation of dyes over TiO₂/ZSM-11

Highlights

● TiO₂/ZSM-11 was prepared by a facile solid state dispersion method.

● Mechanism for photocatalytic degradation of dyes was investigated.

● Both experimental and MD simulations were conducted.

● Chemisorption instead of electrostatic interaction played a critical role.

Abstract

Photocatalytic degradation is a promising way to eliminate dye contaminants. In this work, a series of TiO₂/ZSM-11 (TZ) nanocomposites were prepared using a facile solid state dispersion method. Methyl orange (MO), methylene blue (MB), and rhodamine B (RhB) were intentionally chosen as target substrates in the photocatalytic degradation reactions. Compared to pristine TiO₂, negative effect was observed on MO degradation while promoted kinetics were collected on MB and RhB over TZ composites. Moreover, a much higher photocatalytic rate was interestingly achieved on RhB than MB, which indicated that a new factor has to be included other than the widely accepted electrostatic interaction mechanism to fully understand the selective photodegradation reactions. Systematic characterizations showed that TiO₂ and ZSM-11 physically mixed and maintained both the whole framework and local structure without chemical interaction. The different trends observed in surface area and the photo-absorption ability of TZ composites with reaction performance further excluded both as the promotion mechanism. Instead, adsorption energies predicted by molecular dynamics simulations suggested that differences in the adsorption strength played a critical role. This work provided a deep mechanistic understanding of the selective photocatalytic degradation of dyes reactions, which helps to rationally design highly efficient photocatalysts.

Graphical abstract

Keywords

Selective dye degradation / Photocatalysis / TiO₂ / ZSM-11 / Chemisorption

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Acknowledgements

The authors greatly appreciate the financial support from the Education Department of Hubei Province through the Science and Technology Research Project (China) (B2021059).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-023-1701-5 and is accessible for authorized users.

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