Synthesis of novel CQDs/CeO2/SrFe12O19 magnetic separation photocatalysts and synergic adsorption-photocatalytic degradation effect for methylene blue dye removal

• Published in: Chemical engineering journal advances 2021-05, Vol.6, p.100089, Article 100089
• Main Authors: Wang, Shifa, Gao, Huajing, Fang, Leiming, Hu, Qiwei, Sun, Guangai, Chen, Xiangyu, Yu, Chuan, Tang, Shengnan, Yu, Xianlun, Zhao, Xinxin, Sun, Guangzhuang, Yang, Hua
• Format: Article
• Language: English
• Subjects: Carbon quantum dots; CQDs/CeO2/SrFe12O19; Heterostructure construction; Magnetic separation photocatalyst; Photocatalytic activity; Polyacrylamide gel method
• ISSN: 2666-8211; 2666-8211
• DOI: 10.1016/j.ceja.2021.100089

•A novel CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst have been synthesized.•The CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst exhibit a high efficiency towards adsorption and photocatalytic degradation of methylene blue dye molecule under simulated sunlight irradiation.•A synergistic mechanism of adsorption and photocatalysis for the degradation of methylene blue dye was proposed. A novel carbon quantum dots decorated n-n type CeO2/SrFe12O19 (CQDs/CeO2/SrFe12O19) magnetic separation photocatalyst was successfully synthesized via a hydrothermal method and gamma-ray assisted polyacrylamide gel method combined with low temperature sintering technology. To study the feasibility of CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst as an adsorbent and photocatalyst to remove methylene blue (MB) dye, a series of heterostructure construction, adsorption and photocatalytic experiments were carried out. When compared with pristine CeO2, CQDs/CeO2 or SrFe12O19/CeO2, the CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst exhibit a higher efficiency towards adsorption and photocatalytic degradation of MB dye molecule under simulated sunlight irradiation. The present work suggests that the CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst have rapid magnetic separation, simple synthetic process, high optical absorption coefficient, excellent adsorption capacity, high photocatalytic activity, higher stability and reusability, which shows potential application for removing the organic pollutants in wastewater. A novel CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst was prepared by a hydrothermal method and gamma-ray assisted polyacrylamide gel method combined with low temperature sintering technology. The novel CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst with unique defect structure, high specific surface area and intimate interfacial contact can produce a higher optical absorption coefficient, larger squareness ratio and charge transfer and separation efficiency. The CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst exhibit a high efficiency towards adsorption and photocatalytic degradation of methylene blue dye molecule under simulated sunlight irradiation. The synergistic effect of adsorption and photocatalysis plays an important role in the degradation of methylene blue dye by CQDs/CeO2/SrFe12O19 magnetic separation photocatalyst. [Display omitted]