期刊
RSC ADVANCES
卷 7, 期 72, 页码 45721-45732出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra09022f
关键词
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资金
- China Scholarship Council
- National Natural Science Foundation of China [21207034]
- Provincial Natural Science Foundation of Hunan [2015JJ3056]
- Scientific Research Fund of Hunan Provincial Education Department [17B061, 11C0331]
- National Science Foundation [DMR-1506661]
Reduced TiO2 (TiO2-X) materials with different crystallographic structures were prepared and characterized. Cat. I-A, Cat. II-R, Cat. III-B are TiO2-X with anatase, rutile and brookite structures, respectively, while the Cat. IV-A&R series are materials with anatase and rutile phases mixed in different ratios. All samples exhibit efficient photocatalytic activity for the degradation of norfloxacin (Nor) under visible light, and Cat. IV-A&R-4 is the best among the samples studied. Our results show that the photocatalytic activity is governed by different factors such as the specific surface area of the catalysts as well as the concentrations of Ti3+ and the density of oxygen vacancies in the photocatalytic materials. Mechanistic study of the materials demonstrates that photohole (h(+)) transfer contributes more to Nor degradation than reaction with (OH)-O-center dot radicals and the other reactive oxygen species (ROSs). Intermediate species were characterized by HPLC-TOF-HRMS and HPLC-MS/MS to construct a general transformation mechanism of Nor on the family of TiO2-X under visible light. The study shows that Nor adsorption onto TiO2-X occurs by its heteroatoms followed by cleavage of its piperazine ring and hydroxylation of its quinolone ring under the attack of h(+) and (OH)-O-center dot radicals. The study could assist the further search for efficient photocatalytic materials for the degradation of organic pollutants.
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