title: Catalytic performance of graphene-bimetallic composite for heterogeneous oxidation of acid orange 7 from aqueous solution.
abstract: In this study, reduced graphene oxide (rGO) embedded with bimetallic nanoparticles of cobalt-manganese oxide (CoMn2O4) was fabricated by hydrothermal treatment. The obtained product was characterized and applied for the heterogeneous activation of peroxymonosulfate (PMS) to degrade acid orange 7 (AO7). The characterization results revealed that 10-20 nm nanosized CoMn2O4was homogenously decorated on the surface of rGO. The effect of different CoMn2O4loadings showed that catalyst with a CoMn2O4contents higher than 20% performs stronger capability for catalytic degradation of AO7 compared to pure CoMn2O4. In a system containing 4 mM PMS and 0.05 g/L 50% CoMn2O4/rGO, 100% conversion of AO7 (70 mg/L) and 43% mineralization could be achieved within 12 and 60 min, respectively. Recycling experiment along with XRD data demonstrates good stability of the catalyst for five successive runs. Inhibition confirmation results suggest that surface-bound SO4•-and HO•radicals both played a key role in degradation of AO7. Therefore, this material demonstrates a very efficient catalytic performance for the degradation of organic dyes.
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, 2999# North Renmin Road, Songjiang District, Shanghai, 201620, China.
authors.forename: Jiebing
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, 2999# North Renmin Road, Songjiang District, Shanghai, 201620, China.
authors.forename: Asif
authors.initials: A
authors.lastname: Hussain
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, 2999# North Renmin Road, Songjiang District, Shanghai, 201620, China. lidengxin@dhu.edu.cn.
authors.forename: Dengxin
authors.initials: D
authors.lastname: Li
authors.affiliation: Research Center for Analysis & Measurement, Donghua University, Shanghai, 201620, People's Republic of China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, 2999# North Renmin Road, Songjiang District, Shanghai, 201620, China.
authors.forename: Shihong
authors.initials: S
authors.lastname: Xu
mesh_terms: D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D001557:Benzenesulfonates / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D003035:Cobalt / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D017895:Manganese Compounds; D010087:Oxides; D014874:Water Pollutants, Chemical; D003035:Cobalt; C027424:manganese oxide; D006108:Graphite; C014722:2-naphthol orange; C060728:cobalt oxide
keywords: Acid orange 7 (AO7); CoMn2O4; Peroxymonosulfate (PMS); Reduced graphene oxide (rGO); Sulfate radicals