Natural kaolinite modified black titanium dioxide for efficient visible light assisted photocatalysis

被引：7
作者：
Hu, Peiwei [1 ,2 ]
Zhang, Yan [1 ]
Cheng, Gangli [1 ,3 ]
机构：
[1] Wuhan Univ Sci & Technol, Collage Resources & Environm Engn, 947 Heping Ave, Wuhan 430081, Peoples R China
[2] Wuhan Univ Sci & Technol, Hubei Key Lab Efficient Utilizat & Agglomerat Meta, Wuhan, Peoples R China
[3] China Nucl Power South New Mat Co Ltd, Ganzhou 341000, Peoples R China
来源：
MOLECULAR CATALYSIS | 2023年 / 547卷
基金：
中国国家自然科学基金;
关键词：
Kaolinite; Black TiO 2; Surface modification; Photodegration activity; Methylene blue; SELF-DOPED TIO2; OXYGEN VACANCY; DEGRADATION; NANOPARTICLES; HETEROJUNCTIONS; REDUCTION; NICKEL;
D O I：
10.1016/j.mcat.2023.113312
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A novel black TiO2/kaolinite composite (bTK) was prepared by the hydrothermal method and tested as a photocatalyst. Morphology and structure of samples were systematically characterized by field emission scanning electronic microscopy (FESEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-vis diffuse reflectance spectroscopy (UV-vis DRS) and X-ray photoelectron spectroscopy (XPS). The results showed that black TiO2 (bT) nanoparticles formed point defects were successfully coated as thin layers on the surface of kaolinite. The bTK composite had a narrower band gap and higher specific surface area. XPS results showed that Ti3+ and oxygen vacancies (Vo) existed in bT. The photocatalytic removal performance of bTK composite on methylene blue (MB) was near to 100% in 2 h, which was 32.1% higher than that of bT. Kinetic studies reveal that MB degradation process by the bTK corresponded well to zero-order kinetic.
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页数：9
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