A homojunction-heterojunction dual junction coupled photocatalyst, a preparation method and application thereof

By preparing a homogeneous-heterogeneous dual-junction coupled photocatalyst, the problems of low efficiency and narrow applicability of existing photocatalysts in the degradation of organic wastewater were solved, achieving efficient and broad-spectrum tetracycline degradation and mineralization, which is suitable for environments with multiple pH values.

CN120022925BActive Publication Date: 2025-11-21TIANJIN UNIV
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Patent Information

Application Number
CN202510054023.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-14
Publication Date
2025-11-21
Estimated Expiration
2045-01-14

AI Technical Summary

Technical Problem

Existing photocatalysts suffer from low catalytic efficiency, narrow pH range, poor selectivity in the generation of active species, and sensitivity to interfering ions when degrading organic wastewater. In particular, the generation and migration of charge carriers are limited in carbon nitride-based photocatalysts.

Method used

A homo-heterogeneous double-junction coupled photocatalyst was prepared by combining carbon nitride with iron oxide and sodium acetate under specific conditions to form a homo-heterogeneous double-junction structure with a strong built-in electric field, which promotes charge carrier separation and migration, and selectively generates superoxide radicals (·O2-) to degrade tetracycline.

Benefits of technology

It achieves efficient degradation of tetracycline with a removal rate of 99.8% and a degradation rate constant of 0.1793 min⁻¹. It is applicable to a wide pH range (4.5–12.0), is insensitive to interfering ions, and significantly improves the performance of the photocatalyst.

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Abstract

The application discloses a homogenous-heterogeneous dual junction coupled photocatalyst and a preparation method and application thereof. The preparation method of the homogenous-heterogeneous dual junction coupled photocatalyst comprises the following steps: mixing carbon nitride, lithium chloride and potassium chloride to obtain mixed powder, calcining the mixed powder, cooling and washing, and drying to obtain a precursor; mixing the precursor, ammonium chloride and sodium thiocyanate, grinding to obtain a mixture, calcining the mixture, cooling and washing, and drying to obtain homogenous junction carbon nitride; dispersing ferric chloride hexahydrate and sodium acetate in ethanol, adding H2O drop by drop to obtain a mixed solution, adding the homogenous junction carbon nitride into the mixed solution, ultrasonicating to obtain a dispersion liquid, heating the dispersion liquid, cooling and washing, and drying to obtain the homogenous-heterogeneous dual junction coupled photocatalyst; and the removal rate of the homogenous-heterogeneous dual junction coupled photocatalyst to TC is 99.8% within 20 min, the problem that the heterojunction is limited by the influence of acid and alkalinity is solved, and the pH application range of the photocatalyst is widened.
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