title: A Fe3O4/FeAl2O4 composite coating via plasma electrolytic oxidation on Q235 carbon steel for Fenton-like degradation of phenol.
abstract: The Fe3O4/FeAl2O4 composite coatings were successfully fabricated on Q235 carbon steel by plasma electrolytic oxidation technique and used to degrade phenol by Fenton-like system. XRD, SEM, and XPS indicated that Fe3O4 and FeAl2O4 composite coating had a hierarchical porous structure. The effects of various parameters such as pH, phenol concentration, and H2O2 dosage on catalytic activity were investigated. The results indicated that with increasing of pH and phenol content, the phenol degradation efficiency was reduced significantly. However, the degradation rate was improved with the addition of H2O2, but dropped with further increasing of H2O2. Moreover, 100 % removal efficiency with 35 mg/L phenol was obtained within 60 min at 303 K and pH 4.0 with 6.0 mmol/L H2O2 on 6-cm(2) iron oxide coating. The degradation process consisted of induction period and rapid degradation period; both of them followed pseudo-first-order reaction. Hydroxyl radicals were the mainly oxidizing species during phenol degradation by using n-butanol as hydroxyl radical scavenger. Based on Fe leaching and the reaction kinetics, a possible phenol degradation mechanism was proposed. The catalyst exhibited excellent stability.
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
authors.forename: Jiankang
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Yao
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
authors.forename: Yajing
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
authors.forename: Qixing
authors.initials: Q
authors.lastname: Xia
authors.affiliation: School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China. jiangzhaohua@hit.edu.cn.|State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150001, People's Republic of China. jiangzhaohua@hit.edu.cn.
authors.forename: Zhaohua
authors.initials: Z
authors.lastname: Jiang
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D004572:Electrolysis; D005290:Ferric Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D019800:Phenol / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D013232:Steel / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D005290:Ferric Compounds; D013232:Steel; D019800:Phenol; D002244:Carbon
keywords: Advanced oxidation process; Degradation; Fe3O4/FeAl2O4 composite coating; Fenton-like; Phenol; Plasma electrolytic oxidation