Photodeposition synthesis of CdS QDs-decorated TiO 2 for efficient photocatalytic degradation of metronidazole under vis
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Photodeposition synthesis of CdS QDs-decorated TiO2 for efficient photocatalytic degradation of metronidazole under visible light Peng Wang1,*
, Shiyu Xu4, Jiayu Wang2, and Xuezheng Liu3,*
1
College of Basic Science, Jinzhou Medical University, Jinzhou 121001, China College of Public Foreign Languages, Jinzhou Medical University, Jinzhou 121001, China 3 School of Basic Medical Sciences, Jinzhou Medical University, Jinzhou 121001, China 4 China Pharmaceutical University, Nanjing 210009, China 2
Received: 18 June 2020
ABSTRACT
Accepted: 16 September 2020
Photocatalysis technology has received much attention on the treatment of antibiotics residues. In this paper, CdS quantum dots (QDs)-decorated TiO2 (CDS-T for short) have been prepared successfully through a photodeposition method and utilized as photocatalysts for degradation of metronidazole (MTZ). Under visible light irradiation for 60 min, the degradation ratio of MTZ over CDS-T-3 that was prepared by 3 h of photodeposition reached up to 90.9%, which was 1.5 times than that reached over commercial CdS. The decoration of CdS QDs onto TiO2 can enlarge light absorption range to visible region. Furthermore, greatly improved separation efficiency of photogenerated carriers is realized through forming heterojunction. Activity control experiments demonstrate that O2- serve as the main active species, while OH and holes (h?) play secondary roles on the MTZ degradation. Moreover, electron spin resonance (ESR) technique, terephthalic acid photoluminescence (TA-PL) technique and N,N-diethyl-p-phenylenediamine (DPD) method confirm that larger amounts of active species are generated from CDS-T-3 than that from commercial CdS under visible light. This study can not only offer an easy method to prepare CdS quantum dots-decorated TiO2 but also enlarge its application in solving the problem of metronidazole contamination.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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https://doi.org/10.1007/s10854-020-04504-2
J Mater Sci: Mater Electron
1 Introduction Antibiotics, a class of chemical substances, have become the widely used drugs for the control and treatment of various infectious diseases. However, a lot of antibiotics residues exist in sewage effluent, surface water, underground water and so on [1–4]. The residues of antibiotics in the environment have brought many side effects, such as ecological disruption, antimicrobial resistance and hazard to human health [4–7]. So, how to effectively solve the problem of antibiotics pollution in water has been an important research hotspot. Until now, numerous methods have been adopted to eliminate the antibiotics residues, such as adsorption, electrolysis, biological treatment and ultraviolet irradiation [8–12]. Compared with the above methods, photocatalysis technology has been attracting more and more attention because it possesses many superiorities such as simple operation, high efficiency, energy saving and without s
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