title: Photoelectrochemical performance of birnessite films and photoelectrocatalytic activity toward oxidation of phenol.
abstract: Birnessite films on fluorine-doped tin oxide (FTO) coated glass were prepared by cathodic reduction of aqueous KMnO4. The deposited birnessite films were characterized with X-ray diffraction, Raman spectroscopy, scanning electron microscopy and atomic force microscopy. The photoelectrochemical activity of birnessite films was investigated and a remarkable photocurrent in response to visible light was observed in the presence of phenol, resulting from localized manganese d-d transitions. Based on this result, the photoelectrocatalytic oxidation of phenol was investigated. Compared with phenol degradation by the electrochemical oxidation process or photocatalysis separately, a synergetic photoelectrocatalytic degradation effect was observed in the presence of the birnessite film coated FTO electrode. Photoelectrocatalytic degradation ratios were influenced by film thickness and initial phenol concentrations. Phenol degradation with the thinnest birnessite film and initial phenol concentration of 10mg/L showed the highest efficiency of 91.4% after 8hr. Meanwhile, the kinetics of phenol removal was fit well by the pseudofirst-order kinetic model.
authors.affiliation: The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China. Electronic address: hqzhang_pku@163.com.
authors.forename: Huiqin
authors.initials: H
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China. Electronic address: dhr_100@163.com.
authors.forename: Hongrui
authors.initials: H
authors.lastname: Ding
authors.affiliation: Institutes of Science and Development, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China.
authors.forename: Cuiping
authors.initials: C
authors.lastname: Zeng
authors.affiliation: The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China. Electronic address: ahlu@pku.edu.cn.
authors.forename: Anhuai
authors.initials: A
authors.lastname: Lu
authors.affiliation: The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China.
authors.forename: Changqiu
authors.initials: C
authors.lastname: Wang
mesh_terms: D008956:Models, Chemical; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D019800:Phenol / Q000737:chemistry*; D055668:Photochemical Processes; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D010087:Oxides; D014874:Water Pollutants, Chemical; C505018:birnessite; D019800:Phenol
keywords: Birnessite; Phenol; Photocurrent; Photoelectrocatalytic oxidation; Photoelectrochemical activity