title: Preparation of immobilized coating Fenton-like catalyst for high efficient degradation of phenol.
abstract: In this study, solid acid amorphous Fe3O4/SiO2ceramic coating decorated with sulfur on Q235 carbon steel as Fenton-like catalyst for phenol degradation was successfully prepared by plasma electrolytic oxidation (PEO) in silicate electrolyte containing Na2S2O8as sulfur source. The surface morphology and phase composition were characterized by SEM, EDS, XRD and XPS analyses. NH3-TPD was used to evaluate surface acidity of PEO coating. The results indicated that sulfur decorated amorphous Fe3O4/SiO2ceramic coatings with porous structure and higher acid strength had the similar pore size and the surface became more and more uneven with the increase of Na2S2O8in the silicate electrolyte. The Fenton-like catalytic activity of sulfur decorated PEO coatings was also evaluated. In contrast to negligible catalytic activity of sulfur undecorated PEO coating, catalytic activity of sulfur decorated PEO coating was excellent and PEO coating prepared with 3.0 g Na2S2O8had the highest catalytic activity which could degrade 99% of phenol within 8 min under circumneutral pH. The outstanding performance of sulfur decorated PEO coating was attributed to strong acidic microenvironment and more Fe2+on the surface. The strong acid sites played a key factor in determining catalytic activity of catalyst. In conclusion, rapid phenol removal under circumneutral pH and easier separation endowed it potential application in wastewater treatment. In addition, this strategy of preparing immobilized solid acid coating could provide guidance for designing Fenton-like catalyst with excellent catalytic activity and easier separation.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Jiankang
authors.initials: J
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Yao
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Yajing
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Qixing
authors.initials: Q
authors.lastname: Xia
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Huiya
authors.initials: H
authors.lastname: Chu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China. Electronic address: jiangzhaohua@hit.edu.cn.
authors.forename: Zhaohua
authors.initials: Z
authors.lastname: Jiang
mesh_terms: D002384:Catalysis; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D019800:Phenol / Q000032:analysis*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D017670:Sodium Compounds / Q000737:chemistry*; D013232:Steel / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry*; D013499:Surface Properties; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D052203:Ferrosoferric Oxide; D006861:Hydrogen Peroxide; D007501:Iron; D019800:Phenol; D012822:Silicon Dioxide; D017670:Sodium Compounds; D013232:Steel; D013431:Sulfates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C045076:Fenton's reagent; C024625:sodium persulfate
keywords: Amorphous Fe(3)O(4)/SiO(2); Ceramic coating; Degradation; Fenton-like; Solid acid; Sulfur decoration