Zn0-CNTs-Fe3O4 catalytic in situ generation of H2O2 for heterogeneous Fenton degradation of 4-chlorophenol. (October 2018)

• Record Type: Journal Article
• Authors: Yang, Zhao; Gong, Xiao-bo; Peng, Lin; Yang, Dan; Liu, Yong
• Is Part Of: Chemosphere. Volume 208(2018)
• Page Start: 665
• Page End: 673
• Publication Date: 2018-10
• Subjects: In-situ generation H2O2 -- Zn0-CNTs-Fe3O4 composite -- Heterogeneous Fenton -- 4-chlorophenol; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.06.016
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A novel Zn 0 -CNTs-Fe3 O4 composite was synthesized by the chemical co-precipitation combined with high sintering process at nitrogen atmosphere. The as-prepared composite was characterized by SEM, EDS, XRD, XPS, VSM and N2 adsorption/desorption experiments. A novel heterogeneous Fenton-like system, composed of Zn 0 -CNTs-Fe3 O4 composite and dissolved oxygen (O2 ) in solution, which can in situ generate H2 O2 and OH, was used for the degradation of 4-chlorophenol (4-CP). The influences of various operational parameters, including the initial pH, dosage of Zn 0 -CNTs-Fe3 O4 and initial concentration of 4-CP on the removal of 4-CP were investigated. The removal efficiencies of 4-CP and total organic carbon (TOC) were 99% and 57%, respectively, at the initial pH of 1.5, Zn 0 -CNTs-Fe3 O4 dosage of 2 g/L, 4-CP initial concentration of 50 mg/L and oxygen flow rate of 400 mL/min. Based on the results of the radical scavenger effect study, the hydroxyl radical was considered as the main reactive oxidants in Zn 0 -CNTs-Fe3 O4 /O2 system and a possible degradation pathway of 4-CP was proposed. Graphical abstract: Image Highlights: A novel Zn 0 -CNTs-Fe3 O4 composite was synthesized. Zn 0 -CNTs-Fe3 O4 could react with O2 in solution to generate H2 O2 and OH in situ. The removal efficiencies of 4-CP and TOC could reach to 99% and 57%, respectively. Zn 0 -CNTs-Fe3 O4 could be conveniently separated from solution.