1. Visible-Light-Sensitive SrCO3/AgI Hybrids for Tetracycline Degradation
- Author
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Yudong Guo, Hui Li, Yun-Ning Jia, Hui Wang, Xiang-Feng Wu, Xutao Liu, Yun-Xuan Fu, Wei-Guang Zhang, Jia-Lu Shang, and Tian-Long Chang
- Subjects
Diffraction ,Materials science ,Diffuse reflectance infrared fourier transform ,Analytical chemistry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Catalysis ,Field emission microscopy ,Photocatalysis ,Degradation (geology) ,General Materials Science ,0210 nano-technology ,Visible spectrum - 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.
- Published
- 2020