期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 234, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2019.116100
关键词
BiOBr flower-like microspheres; Selective deposition; Photocatalytic degradation; Spacial charge carrier separation; Antibiotic
资金
- National Natural Science Foundation of China [21573069, U1862112, 21811540394]
- Shanghai Municipal Science and Technology Major Project [2018SHZDZX03]
- Programme of Introducing Talents of Discipline to Universities [B16017]
- Fundamental Research Funds for the Central Universities [50321041917001]
For the first time, we fabricated Au-BiOBr-Co3O4 hierarchical flower-like microspheres by hydrothermal and photo-deposition methods. Au and Co3O4 nanoparticles (NPs) were selectively deposited on the {0 0 1} and {1 1 0} facets of BiOBr nanopetals, respectively. The light absorption, photoluminescence (PL), and electrochemical analyses revealed that the selectively deposited Au and Co3O4 can effectively enhance both the visible-light absorption and charge carrier separation in space. The photocatalytic degradation of sulfadiazine (SD) indicated that the degradation of SD follows the pseudo-first-order reaction and the reaction rate constant was increased 17 times from BiOBr flower-like microspheres (0.00014 min(-1)) to Au and Co3O4 co-modified Au-BiOBr-Co3O4 flower-like microspheres (0.00254 min(-1)). From the high performance liquid chromatographymass spectrometry (HPLC-MS) measurement, it was disclosed that the desulfonated and bromized products are the main intermediates during SD degradation over Au-BiOBr-Co3O4. Meanwhile, the reactive species trapping experiments confirmed that Au-BiOBr-Co3O4 can produce h(+) , O-center dot(2)-, and Br-0 reactive species responsible for antibiotic degradation. On the basis of these experiment results and discussion, the degradation mechanism of SD over Au-BiOBr-Co3O4 was tentatively discussed. We think this work provides a reference to fabricate novel photocatalytic materials for the effective degradation of antibiotics.
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