化工新型材料

化工新型材料 ›› 2025, Vol. 53 ›› Issue (7) : 207-214. DOI: 10.19817/j.cnki.issn1006-3536.2025.07.014

科学研究

S型MoS₂/pg-C₃N₄异质结的构建及其光催化性能研究

刘发强, 夏培蓓, 吴咏梅

作者信息 +

Construction and photocatalytic properties of S-scheme MoS₂/pg-C₃N₄ heterojunctions

Liu Faqiang, Xia Peibei, Wu Yongmei

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文章历史 +

Received		Published
2024-06-18		2025-07-20
Issue Date	Revised Date
2025-07-22	2024-06-18

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摘要

通过水热法将MoS₂负载到介孔类石墨相氮化碳(pg-C₃N₄)表面,制备了MoS₂/pg-C₃N₄异质结。采用系列表征技术对MoS₂/pg-C₃N₄异质结的微观形貌、物相晶型、特征基团、比表面积和孔隙结构、光化学和电化学特性、活性基团以及光生载流子重组等进行了表征。以亚甲基蓝(MB)染料作为污染底物,评价可见光驱动下MoS₂/pg-C₃N₄异质结的光催化活性和稳定性。结果表明:互相堆叠的形貌和丰富的介孔结构实现了对MB的高效吸附;大比表面积、广泛的光谱吸收范围、高效的光生载流子分离效率和低的电荷传质阻力有效提高了光催化活性。可见光照射60min,MoS₂/pg-C₃N₄异质结对MB的降解率达到了99.0%,表现出良好的光催化活性和稳定性,超氧自由基 ·O^-₂和羟基自由基·OH等高活性自由基实现了对MB的高效降解。S型电荷转移机理有效保留了空穴和光电子的优异氧化和还原活性,交错的能带结构和内电场实现了高效的电荷分离。

Abstract

The MoS₂/pg-C₃N₄ heterojunctions were prepared by loading MoS₂ onto the surface of mesoporous graphite phase carbon nitride (pg-C₃N₄) by hydrothermal method.The microstructure,crystal phase,characteristic groups,specific surface area and pore structure,photochemical and electrochemical properties,active groups and photogenerated carrier recombination of the MoS₂/pg-C₃N₄ heterojunction materials were characterized by detailed and systematic characterization techniques.The photocatalytic activity and stability of the MoS₂/pg-C₃N₄ heterojunction materials under visible light were evaluated by using methylene blue (MB) dye as a pollution substrate.The results showed that the stacked morphology and abundant mesoporous structure achieved efficient MB adsorption.The high specific surface area,wide spectral absorption range,efficient photogenerated carrier separation efficiency and low charge transfer resistance effectively improved the photocatalytic activity.Under visible light irradiation for 60min,the degradation rate of MB by MoS₂/pg-C₃N₄ heterojunction material reached 99.0%,demonstrating good photocatalytic activity and stability.Highly active radicals such as ·O^-₂ and ·OH achieved efficient degradation of MB.The S-scheme charge transfer mechanism effectively retained the excellent oxidation and reduction activity of holes and photoelectrons,and the staggered band structure and internal electric field achieved efficient charge separation.

关键词

pg-C₃N₄ / MoS₂ / 异质结 / 光催化 / S型电荷转移机理 / 亚甲基蓝

Key words

pg-C₃N₄ / MoS₂ / heterojunction / photocatalysis / S-scheme charge transfer mechanism / methylene blue

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S型MoS₂/pg-C₃N₄异质结的构建及其光催化性能研究[J]. 化工新型材料, 2025, 53(7): 207-214 DOI:10.19817/j.cnki.issn1006-3536.2025.07.014

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基金资助

国家自然科学基金(21667029)

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