NZVI-biochar derived from Fe3O4-loaded rabbit manure for activation of peroxymonosulfate to degrade sulfamethoxazole. (February 2022)

• Record Type: Journal Article
• Authors: Huang, Wen; Tang, Yaxin; Zhang, Xueping; Luo, Ze; Zhang, Jianqiang
• Is Part Of: Journal of water process engineering. Volume 45(2022)
• Publication Date: 2022-02
• Subjects: Peroxymonosulfate -- Sulfamethoxazole -- nZVI -- Rabbit manure -- Radical pathway -- Nonradical pathway; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2021.102470
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: The pollution problem of livestock manure generated by the rapid development of farming industry is becoming more and more serious, and its conversion into functional materials through a new way is of great practical significance for its resource utilization. For the first time, nano zero-valent iron (nZVI)/biochar composites (Fe-RMC-850) were prepared by carbonizing Fe3 O4 -rabbit dung and used to activate PMS for degradation of sulfamethoxazole (SMX). The results showed that Fe-RMC-850 had high catalytic activity due to its rich pore, high graphitization and defective structure. When the dosage of Fe-RMC-850 and PMS were 0.3 g/L and 0.25 g/L respectively, the degradation rate of SMX could reach 100% within 20 min, and it still showed good catalytic stability after 5 cycles of experiments. The radical quenching, EPR and XPS results showed that radical and nonradical pathways acted synergistically in the degradation of SMX, in which nZVI, Fe 2+ -biochar and pyridinic N were used as the main active sites of the radical pathway. The nonradical pathway was attributed to the generation of C-O and COO by the oxygen-containing functional groups on the biochar surface. Moreover, the inherent P atoms formed PC and CPO3 /C2 PO2, thereby producing defective structures, while the graphitic carbon layer provided good electron transfer sites. Consequently, this study provides a nZVI-rabbit manure biochar composite PMS catalytic material with high organic pollutant degradation efficiency and offers a new option for the resource utilization of manure sources. Graphical abstract: Unlabelled Image Highlights: Fe-RMC-850 activated PMS synthesized by rabbit manure and Fe3 O4 . Temperature has a large influence on the structure of the material. Iron and biochar synergistically promote ROS production. Fe-RMC-850 has a strong reusable performance.