A Sn3O4-Ag-Ag2O photoelectric material based on TiO2 nanotubes and its preparation method

By constructing Ag2O/Sn3O4 Z-type heterojunction on TiO2 nanotubes, the problem of low efficiency of traditional photocatalysts is solved, efficient dyeing wastewater treatment and H2 generation are achieved, and the stability and activity of the photocatalysts are improved.

CN116637608BActive Publication Date: 2025-08-22CHINALAND SOLAR ENERGY
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Patent Information

Application Number
CN202310377911.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-11
Publication Date
2025-08-22
Estimated Expiration
2043-04-11

AI Technical Summary

Technical Problem

Traditional treatment methods cannot effectively destroy the high stability and toxicity of azo dyes. The existing Sn3O4/TiO2 NTs photocatalysts have low photocatalytic performance, and insufficient research on Ag2O photocatalysts, resulting in low treatment efficiency of dyeing wastewater.

Method used

Ag2O/Sn3O4 Z-type heterojunction was constructed on TiO2 nanotubes, and Sn3O4-Ag-Ag2O nanoparticles were prepared by hydrothermal method to form an indirect Z-type heterojunction to improve photocatalytic performance.

Benefits of technology

High-efficiency photocatalytic degradation of dyed wastewater was achieved, with the removal rates of MO, RhB, MB and Cr(VI) reaching 90.89%, 81.42%, 83.84% and 66.67%, respectively. The visible light-driven photocatalytic H2 generation rate was as high as 55.79μmol·cm⁻²·h⁻¹, and the photocatalyst stability and activity were significantly improved.

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Abstract

This invention discloses a Sn3O4-Ag-Ag2O photoelectric material based on TiO2 nanotubes and its preparation method, belonging to the field of photoelectric materials technology. The invention uses a hydrothermal Sn3O4-Ag-Ag2O nanoparticle method on a TiO2 nanotube array to construct an indirect Z-type heterojunction. The material exhibits high photocatalytic activity in dye degradation and water decomposition to produce hydrogen. The prepared sample showed strong photocatalytic ability and stability in organic dye degradation and Cr(VI) removal, with a visible light-driven photocatalytic hydrogen production rate of 55.79 μmol·cm ‑2 ·h ‑1 Photoelectrocatalytic data and electron spin resonance (ESR) signal results indicate that the composite photoelectrode forms an indirect Z-type electron transfer pathway, providing guidance for the preparation of composite photoelectrode materials with high optical and photocatalytic properties. The Z-type heterojunction structure will show broad application prospects in the design and application of photocatalysts.
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