Silver/silver halide supported on mesoporous ceria particles and photo-CWPO degradation under visible light for organic compounds in acrylonitrile wastewater

• Published in: RSC advances 2021-08, Vol.11 (43), p.26791-26799
• Main Authors: Zhao, Guozheng, Tan, Qingwei, Li, Changbo, Shang, Liyan, Zhang, Daihang, Lu, Xuanxuan, Qiu, Feng
• Format: Article
• Language: English
• Subjects: Block copolymers; Catalysts; Cerium nitrate; Cerium oxides; Chemical composition; Chemistry; Hydrogen peroxide; Morphology; Organic compounds; Performance degradation; Photodegradation; Pore size; Raw materials; Reaction time; Silver chloride; Silver nitrate; Wastewater
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d1ra04465f

Silver/silver halide supported on ordered mesoporous ceria particles (Ag/AgCl/CeO 2 ) were rapidly prepared by microwave-assisted soft template method, deposition precipitation method and photoreduction method, using cerium nitrate and silver nitrate as raw materials and block copolymer F127 as a template. The morphology, structure and chemical composition of the catalyst were characterized by XRD, SEM, EDS, TEM, N 2 adsorption-desorption and UV-Vis Drs. Catalytic wet peroxide system assisted with visible light photocatalysis (photo-CWPO) was conducted to investigate the performance of organics degradation by Ag/AgCl/CeO 2 as a catalyst in acrylonitrile wastewater. The results showed that the Ag/AgCl/CeO 2 prepared has an ordered mesoporous structure, Ag and AgCl are formed on the surface of CeO 2 , with a specific surface area of 302.6-336.2 m 2 g −1 and the average pore size is 8.04-8.90 nm. There is a strong absorption in the visible region and a band gap of 2.9 eV. The Ag/AgCl/CeO 2 catalyst has higher catalytic performance in the photo-CWPO system than in the CWPO system alone. Ag loading, catalyst and H 2 O 2 dosage, and pH value can affect the COD removal. When the concentration of COD in acrylonitrile wastewater was 500 mg L −1 , the amount of catalyst was 200 mg, the amount of H 2 O 2 (30%) was 8 mL, and the reaction time was 60 min, the COD removal reached 90%. Silver/silver halide supported on ordered mesoporous ceria particles (Ag/AgCl/CeO 2 ) were prepared by microwave-assisted soft template method, deposition precipitation method and photoreduction method, and its catalytic performance was investigated.