Visible-Light-Sensitive SrCO 3 /AgI Hybrids for Tetracycline Degradation
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https: //doi. org/10.1007/s11595-020-2334-1
Visible-Light-Sensitive SrCO3/AgI Hybrids for Tetracycline Degradation JIA Yunning1,2, WU Xiangfeng1*, LI Hui1, ZHANG Weiguang1, WANG Hui1, CHANG Tianlong1, FU Yunxuan1, LIU Xutao1, GUO Yudong1, SHANG Jialu1
(1. School of Materials Science and Engineering, Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2. Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, Tianjin 300384, China) Abstract: The SrCO3/AgI photocatalysts were prepared via a co-precipitation method by using SrCO3 as a co-photocatalyst and AgI as a photo sensitizer. X-ray diffraction, field emission scanning electron microscope, X-ray photoelectron spectrometer, UV-vis diffuse reflectance spectroscopy and electrochemical impedance spectroscope were used to analyze the structure, micro-morphology, chemical compositions, optical properties and photo-generated carrier behaviors of the as-prepared samples, respectively. The photocatalytic degradation mechanism of the as-developed composites was also proposed. Analysis results show SrCO3, an insulator, can improve the photocatalytic performances and recyclability of AgI for degrading tetracycline under visible light. As the theoretical molar ratio of Sr(NO3)2 to AgNO3 increases, the degradation efficiency of the hybrids first increases and then descends. When the theoretical molar ratio of that is 1: 1, it acquires the maximum of 66.6% within 8 min. This is higher than 32.0% of pure AgI and 34.0% of SrCO3. Moreover, after three times degradations it is 63.0%, which is higher than 13.6% of AgI. The improvement of the photocatalytic performance of the sample is attributed to the construction of hybrids. The main activated species in catalysis process are superoxide radicals. Key words: AgI; SrCO3; insulator; photocatalysts; tetracycline
1 Introduction In the past years, antibiotics such as tetracycline (TC) are extensively used in biomedicine due to its relatively low price and wide spectrum of antibacterial activity[1-4]. Generally, these antibiotics, as organics, are often structural stable in environment and easily cause water pollution. Therefore, it is urgent to develop some effective routes to solve this issue. At present, several methods, such as physical absorption, microbiological and chemical degradation, have been developed[5-7]. However, environmental purification technologies are oriented towards low-cost, resourcerich and high-performance. The above-mentioned © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Apr. 17, 2019; Accepted: July 18, 2020) JIA Yunning(贾云宁): E-mail: [email protected] *Corresponding author: WU Xiangfeng(吴湘锋): Ph D; Assoc. Prof.; E-mail: [email protected] Funded by the Natural Science Foundation of Hebei Province, China (Nos. E2019210251 and B2019210331), the Innovation Ability Improvement Project of Heb
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