化工学报 ›› 2025, Vol. 76 ›› Issue (12): 6351-6365.DOI: 10.11949/0438-1157.20250443

• 催化、动力学与反应器 • 上一篇    下一篇

多孔TiO2/g-C3N4异质结的制备及其光催化辅酶再生性能研究

孙菲雪(), 刘宁, 刘文芳(), 孟子晖   

  1. 北京理工大学化学与化工学院,北京 102488
  • 收稿日期:2025-04-25 修回日期:2025-05-30 出版日期:2025-12-31 发布日期:2026-01-23
  • 通讯作者: 刘文芳
  • 作者简介:孙菲雪(2000—),女,硕士研究生,sfx001123tp@163.com
  • 基金资助:
    国家自然科学基金项目(22378021)

Fabrication of porous TiO2/g-C3N4 heterojunction and investigation on its photocatalytic performance of coenzyme regeneration

Feixue SUN(), Ning LIU, Wenfang LIU(), Zihui MENG   

  1. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China
  • Received:2025-04-25 Revised:2025-05-30 Online:2025-12-31 Published:2026-01-23
  • Contact: Wenfang LIU

摘要:

光催化辅酶再生对生物氧化还原反应具有重要意义。采用溶胶-凝胶法制备了多孔TiO2-60,经300℃煅烧获得TiO2-300,再与三聚氰胺混合煅烧得到多孔TiO2/g-C3N4异质结。考察了TiO2煅烧、三聚氰胺用量对催化剂结构和性能的影响,并优化了催化剂用量。结果表明:TiO2的煅烧使晶相从金红石相转变为锐钛矿晶型,制备的TiO2/g-C3N4具有高比表面积、宽吸收边、窄带隙及更好的电荷分离效率;随着三聚氰胺用量的增加,比表面积和孔体积先增加后减小,光吸收和电荷分离性能先上升后下降;优化后,催化活性和收率分别为4.8 mmol/(L·g·min)和72%,分别是g-C3N4的7.4倍和5.3倍,且在5次循环中性能稳定。

关键词: 多孔TiO2, g-C3N4, 异质结, 光催化, 辅酶再生

Abstract:

Photocatalytic coenzyme regeneration holds great significance for bio-redox reactions. Porous TiO2-60 was prepared via sol-gel method. After calcined at 300℃, TiO2-300 was obtained and then mixed with melamine and calcined again to get a porous TiO2/g-C3N4 heterojunction. The effects of TiO2 calcination and melamine dosage on the structure and performance of catalyst were studied, and the catalyst dosage was optimized. The results showed that TiO2 calcination engendered the crystal phase to transform from rutile to anatase. The as-prepared TiO2/g-C3N4 featured high specific surface area, broad absorption edge, narrow band gap, and better charge separation efficiency. With increasing melamine dosage, the specific surface area and pore volume first increase and then decreased, while the light absorption and charge separation properties first increase and then decreased. After optimization, the catalytic activity and yield reached 4.8 mmol/(L·g·min) and 72% respectively, about 7.4 and 5.3 times those of g-C3N4. Moreover, the catalyst showed stable performance over five cycles.

Key words: porous TiO2, g-C3N4, heterojunction, photocatalysis, NADH regeneration

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