Birnessite films on fluorine-doped tin oxide(FTO) coated glass were prepared by cathodic reduction of aqueous KMnO_4. 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 10 mg/L showed the highest efficiency of 91.4% after 8 hr. Meanwhile, the kinetics of phenol removal was fit well by the pseudofirst-order kinetic model.
展开▼
机译:Alkaloid extracts from Bitter leaf ( i Vernonia amygdalina/iVernonia amygdalina ) and Black nightshade ( i Solanum nigrum/iSolanum nigrum ) inhibit phosphodiesterase‐5, arginase activities and oxidative stress in rats penile tissue
机译:The nitric oxide production and NADPH-diaphorase activity in root tips of Vicia faba L. under copper toxicity Ting Zou, Li Ping Zheng, Hui Yan Yuan, Ya Fei Yuan, Jian Wen Wang Abstract