Preparation method and application of Type-Ⅱ TiO2 / g-C3N4 composite photocatalytic material

By constructing Type-II TiO2/g-C3N4 composite photocatalytic material, the existing photocatalytic materials have been solved, with low efficiency, high cost and great environmental impact in uranium pollution treatment, and the efficient, low-cost and environmentally friendly photocatalytic reduction effect is achieved.

CN116474815BActive Publication Date: 2025-03-25CHINA WEST NORMAL UNIVERSITY +1
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Patent Information

Application Number
CN202310483669.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-28
Publication Date
2025-03-25
Estimated Expiration
2043-04-28

AI Technical Summary

Technical Problem

Existing photocatalytic materials are inefficient in uranium pollution treatment, with high preparation costs and great environmental impact, making it difficult to achieve efficient, low-cost and environmentally friendly photocatalytic reduction effect.

Method used

Titanium dioxide nanosheets were prepared by hydrothermal reaction using Type-II TiO2/g-C3N4 composite photocatalytic material, and fixed them on tubular carbon nitride to construct heterojunctions and enhance photocatalytic performance.

Benefits of technology

The photocatalytic reduction effect of uranium with low cost, environmental protection and high stability is achieved, and the photocatalytic reduction and fixation capacity of uranium is significantly improved, which is better than the pure phase TiO2 and g-C3N4 photocatalytic materials.

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Abstract

The present invention discloses a Type-Ⅱ TiO 2 / g‑C 3 N 4 The preparation method and application of a composite photocatalytic material include: uniformly mixing tetrabutyl titanate and a hydrofluoric acid solution, preparing a thin layer of titanium dioxide nanosheets through a hydrothermal reaction; adding the prepared titanium dioxide nanosheets to a melamine aqueous solution at a certain mass ratio, uniformly dispersing, and then loading the titanium dioxide nanosheets on the surface of a tubular carbon nitride precursor through a hydrothermal reaction, and cooling, washing and drying to obtain a composite material of titanium dioxide and a hexagonal micron-sized carbon nitride precursor; quantitatively weighing the above-mentioned composite material and performing a thermal polycondensation treatment in a tubular furnace to obtain a Type-II TiO 2 / g‑C 3 N 4 Composite photocatalytic material; the tubular structure increases the loading of titanium dioxide nanosheets and increases the contact area of ​​the composite material; the construction of the heterojunction effectively reduces the probability of photogenerated electron-hole recombination, and can efficiently photocatalytically reduce uranyl ions (VI), and can be used as an ideal candidate material for waste liquid treatment.
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