S型TiO2/C3N5异质结光催化剂的制备及降解亚甲基蓝性能

doi:10.3969/j.issn.2097-2806.2025.08.004

摘要/Abstract

摘要：

以钛酸异丙酯和富氮氮化碳（C₃N₅）为原料，通过回流法制备了TiO₂/C₃N₅异质结光催化剂。采用XRD、FT-IR、TEM、UV-vis DRS和PL等手段详细表征了光催化剂的物相化学组成、微观形貌、光吸收响应和光生载流子分离重组。以亚甲基蓝（MB）作为目标污染物，评价了TiO₂/C₃N₅异质结光催化剂的活性和稳定性，基于活性基团猝灭和能带理论提出了光催化机理。结果表明，TiO₂和C₃N₅之间异质结的构建提升了可见光吸收响应能力，有效促进了光生载流子的分离。质量比为1:2的TiO₂/C₃N₅异质结光催化剂表现出优异的光催化活性，可见光照射下MB的降解率最高达到了98.60%。循环使用5次后MB的降解率仍达到了98.30%。S型机理保留了高氧化和还原活性的空穴（h⁺）和电子（e^-），通过弯曲能带和内电场的构建实现了高效的电荷分离，体系中产生了大量的超氧自由基（·O₂^-），实现了MB的高效降解。

关键词: C₃N₅, TiO₂, 异质结, 光催化, 亚甲基蓝, S型机理

Abstract:

TiO₂/C₃N₅ heterojunction photocatalyst was prepared by reflux method using isopropyl titanate and nitrogen-rich carbon nitride （C₃N₅） as raw materials. XRD, FT-IR, TEM, UV-vis DRS and PL were used to characterize the photocatalyst in phase composition, chemical composition, microstructure, light-response absorption, and the separation and recombination of photogenerated carriers. Methylene blue （MB） was used as the target pollutant to evaluate the activity and stability of the TiO₂/C₃N₅ heterojunction photocatalyst. The photocatalytic mechanism was proposed based on the free radical quenching and energy band theory. The results showed that the construction of heterojunction between TiO₂ and C₃N₅ enhanced the visible-light-response absorption ability and effectively promoted the separation of photogenerated carriers. The TiO₂/C₃N₅ heterojunction photocatalyst with the mass ratio of 1:2 showed excellent photocatalytic activity, and the degradation percentage of MB reached 98.60% under visible light irradiation. After 5 cycles, the degradation percentage of MB still reached 98.30%. In the S-scheme photocatalytic mechanism, the holes （h⁺） and electrons （e^-） with high oxidation activity and reduction activity, respectively, were retained, and efficient charge separation was achieved through energy-band bending and the construction of internal electric field. Therefore, a large amount of superoxide radicals （·O₂^-） were generated in the system to achieve efficient degradation of MB.

Key words: C₃N₅, TiO₂, heterojunction, photocatalysis, methylene blue, S-scheme

中图分类号:

O643.3

胡怀生, 张鹏会. S型TiO₂/C₃N₅异质结光催化剂的制备及降解亚甲基蓝性能[J]. 日用化学工业（中英文）, 2025, 55(8): 980-988.

Huaisheng Hu, Penghui Zhang. S-scheme TiO₂/C₃N₅ heterojunction photocatalyst and its performance in degradation of methylene blue[J]. China Surfactant Detergent & Cosmetics, 2025, 55(8): 980-988.

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材料	比表面积/ （m²/g）	孔容/ （cm³/g）	平均孔径/ nm
TiO₂	61.25	0.264	4.78
C₃N₅	16.48	0.162	8.97
TiO₂/C₃N₅（1:2）	72.16	0.112	7.83

S型TiO₂/C₃N₅异质结光催化剂的制备及降解亚甲基蓝性能

S-scheme TiO₂/C₃N₅ heterojunction photocatalyst and its performance in degradation of methylene blue

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