期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 247, 期 -, 页码 57-69出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.01.090
关键词
Bulk g-C3N4; CsPbBr3 QDs; Nano Ag; Degradation; 7-Aminocephalosporanic acid
资金
- National Natural Science Foundation of China [21476183, 21676213]
- Graduate student innovation Foundation of Northwest University [YZZ17129]
- Scientific research plan projects of Shangluo University [18SKY011]
- Fundamental Research Funds for State Pharmaceutical Administration of Shangluo [SFK2016-01-04]
- Fundamental Research Funds of Shaanxi OK pharmaceutical co., LTD [2016HXKY010]
A visible-light-induced antibiotics degradation system based on a nano-Ag, CsPbBr3 quantum dot (QDs) and bulk g-C3N4 (CN) ternary assembly (Ag-CsPbBr3/CN) has been firstly constructed under an organic phase environment, oleylamine (OLA) and oleic acid (OA) were used as surfactants to stabilize the CsPbBr3, L-cysteine was used to facilitate the interaction between nano-Ag, CsPbBr3 and CN. The new ternary assembly of Ag-CsPbBr3/CN composite was used to degrade 7-aminocephalosporanic acid (7-ACA) under visible light irradiation, and the 7%-Ag-CsPbBr3/CN composite displayed the superior photocatalytic activity, approximately 92.79% of 7-ACA has been degraded to CO2, 1120 and other small molecules at 140 min, which was approximately 1.49-folds, 1.56-folds, 3.01-folds and 11.43-folds higher than 9%-CsPbBr3/CN, 7%-Ag/CN, pure CN and pure CsPbBr3, respectively. A possible mechanism for 7-ACA degradation over Ag-CsPbBr3/CN composite were proposed according to detailed measurements of adsorption test, Brunauer-Emmett-Teller (BET) measurement, UV-vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), transient photocurrent response and electrochemical impedance spectroscopy (EIS) measurement, and the enhanced photocatalytic activity of Ag-CsPbBr3/CN composite could be attributed to the excellent adsorbability, the enhanced light-harvesting and reduced charge recombination, as well as the synergistic effects of nano-Ag and CsPbB(r)3 co-loaded with CN. In addition, Holes (11) and hydroxyl radicals ((OH)-O-center dot) played major roles, electronic (e(-)) and superoxide radical (O-center dot(2)-) played minor roles based on the reactive-species-trapping experiments, the NBT transformation and the 7-hydroxycoumarin fluorescent experiments. Furthermore, a possible 7-ACA degradation pathway was investigated based on the Liquid Chromatography-Mass spectroscopy (LC-MS) experiment to better understand the degradation process. The present opens up a new insight for using CsPbBr3 as photocatalyst to degrade antibiotics.
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