Structural engineering of Ti3C2-TiO2 nanoflowers modified with oxygen vacancy for photocatalytic applications

文献类型： 外文期刊

第一作者： Asghar, Zeeshan

作者： Asghar, Zeeshan;Rehman, Zia Ur;Hou, Jianhua;Wang, Xiaozhi;Asghar, Zeeshan;Rehman, Zia Ur;Butt, Faheem K.;Zheng, Kewang;Liu, Yuxue;Lin, Hui;Zhang, Yongcai

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关键词： Dye degradation; Photocatalysis; Photocatalytic H2 evolution; CO2 reduction

期刊名称：RENEWABLE ENERGY （ 影响因子：9.1； 五年影响因子：8.3 ）

ISSN： 0960-1481

年卷期： 2025 年 248 卷

页码：

收录情况： SCI

摘要： Titanium carbide (Ti3C2) is a promising photocatalyst to address environmental issues and energy applications. A novel in situ technique used to synthesize Ti3C2-TiO2 nanoflower, employing a combination of oxidation, alkalization, ion exchange, and calcination of Ti3C2 to enhance photocatalytic activity. During oxidation, Ti3C2 undergoes a structural change where carbon atoms are replaced by oxygen, forming TiO2. This transformation converts Ti3C2 to TiO2 from a highly conductive, near-zero band gap material to a semiconductor with a substantial band gap, oxygen vacancies, enhancing charge separation and migration, exhibiting an essential boost in photocatalytic performance. The photocatalytic efficiency of Ti3C2-TiO2-2 increased substantially due to appropriate bandgap (3.02 eV), excellent photocurrent response (8.2 mu A cm-2), and large specific surface area (129.9 m2 g-1). The photocatalytic H2 evolution rate of 1647.6 mu mol g-1 h-1, CO2 reduction rate of 7.8 mu mol g-1 h-1, and dye removal efficiency for Ciprofloxacin (98.5 %, in 90 min), TC (99.2 %, in 60-min) confirms effectiveness of created TiO2 on the surface of Ti3C2. The synergistic effect of Ti3C2 and TiO2 produces a Schottky junction that improves the charge separation and efficiently hinders the recombination rate for excellent photocatalytic efficiency. This study presents an innovative approach to designing advanced nanostructures for improved photocatalytic efficiency.

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