title: Heterogeneous oxidation of diclofenac in the presence of α-MnO2 nanorods: influence of operating factors and mechanism.
abstract: Diclofenac (DCF), one of the pharmaceutical and personal care products that has been widely detected in water, was selected as a model pollutant to evaluate the oxidation activity of α-MnO2 nanorods. The results showed that the heterogeneous oxidation process is highly pH dependent, with higher degradation efficiency at lower pH values. The complete removal of DCF was obtained within 80 min at the solution pH value of 2.5. The oxidation kinetics of DCF can be modeled by Langmuir-Hinshelwood equation (R2>0.999). The effects of various operating parameters, including initial solution pH, α-MnO2 dosage, anions, and cations, on the oxidation efficiency were investigated in detail. A possible reaction pathway for DCF was proposed. In addition, it was demonstrated that the α-MnO2 nanorods can be recycled without decreasing their oxidation activity after 10 cycles.
authors.affiliation: Institute of Municipal Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China E-mail: yemiao008@zju.edu.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute of Municipal Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China E-mail: yemiao008@zju.edu.cn.
authors.forename: Tuqiao
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Institute of Municipal Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China E-mail: yemiao008@zju.edu.cn.
authors.forename: Miaomiao
authors.initials: M
authors.lastname: Ye
mesh_terms: D004008:Diclofenac / Q000737:chemistry*; D007700:Kinetics; D017895:Manganese Compounds / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D012996:Solutions; D014867:Water; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D017895:Manganese Compounds; D010087:Oxides; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D004008:Diclofenac; C016552:manganese dioxide