期刊
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
卷 340, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2023.123197
关键词
Oxygen vacancy (OV); Plasma electrolytic oxidation; Tetracycline (TC); Photocatalytic activity; PMS activation
In this study, a visible light-responsive black TiO2 photocatalytic coating with controlled formation of oxygen vacancies and Ti3+ species was developed to enhance photocatalytic reactions. By precisely controlling semiconductor defects, electron/hole recombination is reduced and the band gap is narrowed, leading to improved catalytic efficiency. The results demonstrate exceptional stability and effectiveness of the coating in tetracycline degradation.
Herein, we have developed a visible light-responsive black TiO2 photocatalytic coating with controlled formation of oxygen vacancies (OV) and Ti3+ species, crucial for enhancing photocatalytic reactions. The rational control of these semiconductor defects was achieved through plasma electrolytic oxidation (PEO), followed by NaOH posttreatment. The coating's effectiveness was evaluated by tetracycline (TC) degradation. The surface defects function as traps, reducing electron/hole recombination and forming mid-gap/localized-donor states, narrowing the band gap. Rigorous material characterization confirmed unaffected morphology and PEO coating phases, while increasing the density of OVs and Ti3+ species. As a result, TC photo-degradation was similar to 3.5 times higher compared to plain PEO coatings. The material demonstrated exceptional stability and efficiency, while it was successfully intensified via peroxymonosulfate (PMS) activation, leading to high synergies (2.10). Scavenger tests revealed the existence of both radical/non-radical pathways, indicating the prevailing photocatalytic mechanism and the key differences achieved through this novel process.
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