In this work, CdS sensitized TiO2 nanotube arrays （CdS/TiO2NTs） electrode was synthesized with the CdS deposition on the highly ordered titanium dioxide nanotube arrays （TiO2NTs） by sequential chemical bath deposi...In this work, CdS sensitized TiO2 nanotube arrays （CdS/TiO2NTs） electrode was synthesized with the CdS deposition on the highly ordered titanium dioxide nanotube arrays （TiO2NTs） by sequential chemical bath deposition method （S-CBD）. The as-prepared CdS/TiO2NTs was characterized by field-emission scanning electron mi- croscopy （FE-SEM） and X-ray diffraction （XRD）. The results indicated that the CdS nanoparticles were effectively deposited on the surface of TiOeNTs. The amperometric I-t curve on the CdS/TiO2NTs electrode was also presented. It was found that the photocurrent density was enhanced significantly from 0.5 to 1.85 mA/cm2 upon illumination with applied potential of 0.5 V at the central wavelength of 253.7 nm. The photoelectrocatalytic （PEC） activity of the CdS/TiO2NTs electrode was investigated by degradation of methyl orange （MO） in aqueous solution. Compared with TiO2NTs electrode, the degradation efficiencies of CdS/TiO2NTs electrode increased from 78% to 99.2% under UV light in 2 h, and from 14% to 99.2% under visible light in 3 h, which was caused by effective separation of the electrons and holes due to the effect of CdS, hence inhibiting the recombination of electron/hole pairs of TiO2NTs.展开更多
A new electrochemically-modified BiVO_(4)-MoS_(2)-Co_(3)O_(4)(represented as E-BiVO_(4)-MoS_(2)-Co_(3)O_(4))thin film electrode was successfully synthesized for environmental application.MoS_(2)and Co_(3)O_(4)were gro...A new electrochemically-modified BiVO_(4)-MoS_(2)-Co_(3)O_(4)(represented as E-BiVO_(4)-MoS_(2)-Co_(3)O_(4))thin film electrode was successfully synthesized for environmental application.MoS_(2)and Co_(3)O_(4)were grown on the surface of Bi VO 4 to obtain BiVO_(4)-MoS_(2)-Co_(3)O_(4).E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)film was achieved by further electrochemical treatment of BiVO_(4)-MoS_(2)-Co_(3)O_(4).The asprepared E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)exhibited significantly enhanced photoelectrocatalytic activity.The photocurrent density of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)thin film is 6.6 times that of Bi VO 4 under visible light irradiation.The degradation efficiency of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)for bisphenol A pollutant was 81.56%in photoelectrochemical process.The pseudo-first order reaction rate constant of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)film is 3.22 times higher than that of Bi VO 4.And its reaction rate constant in photoelectrocatalytic process is 14.5 times or 2 times that in photocatalytic or electrocatalytic process,respectively.The improved performance of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)was attributed to the synergetic effects of the reduction of interfacial charge transfer resistance,the formation of oxygen vacancies and sub-stoichiometric metal oxides and higher separation efficiency of photogenerated electron-hole pairs.E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)is a promising composite material for pollutants removal.展开更多
In this paper,a photoelectrocatalytic(PEC)recovery of toxic H_(2)S into H_(2)and S system was proposed using a novel bismuth oxyiodide(BiOI)/tungsten trioxide(WO_(3))nano-flake arrays(NFA)photoanode.The BiOI/WO_(3)NFA...In this paper,a photoelectrocatalytic(PEC)recovery of toxic H_(2)S into H_(2)and S system was proposed using a novel bismuth oxyiodide(BiOI)/tungsten trioxide(WO_(3))nano-flake arrays(NFA)photoanode.The BiOI/WO_(3)NFA with a vertically aligned nanostructure were uniformly prepared on the conductive substrate via transformation of tungstate following an impregnating hydroxylation of BiI3.Compared to pure WO_(3)NFA,the BiOI/WO_(3)NFA promotes a significant increase of photocurrent by 200%.Owing to the excellent stability and photoactivity of the BiOI/WO_(3)NFA photoanode and I-/I-3 catalytic system,the PEC system toward splitting of H_(2)S totally converted S_(2)-into S without any polysulfide(Sn-x)under solar-light irradiation.Moreover,H_(2)was simultaneously generated at a rate of about 0.867 mL/(h·cm).The proposed PEC H_(2)S splitting system provides an efficient and sustainable route to recover H_(2)and S.展开更多
In this study,sulfur-doped TiO2 /Ti photoelectrodes were prepared by anodization. The morphology, crystalline structure,composition of sulfur-doped TiO2 /Ti film and light absorption property were examined by SEM,XRD,...In this study,sulfur-doped TiO2 /Ti photoelectrodes were prepared by anodization. The morphology, crystalline structure,composition of sulfur-doped TiO2 /Ti film and light absorption property were examined by SEM,XRD,XRF,XPS and UV/VIS respectively. Dimethyl phthalate( DMP) ,one kind of environmental disrupting chemicals( EDCs) ,was degraded by the optimized photoelectrodes. Power of xenon light,initial concentration of DMP,photoelectrocatalytic( PEC) area of photoelectrode and bias were investigated in the study on kinetics of PEC degradation of DMP. Hence,this study concluded that the optimum conditions were power of xenon light 150 W,initial concentration of DMP 1 mg/L,PEC area of sulfur-doped TiO2 /Ti photoelectrode 10 cm2,bias 1. 3 V in the PEC reaction system.展开更多
文摘In this work, CdS sensitized TiO2 nanotube arrays （CdS/TiO2NTs） electrode was synthesized with the CdS deposition on the highly ordered titanium dioxide nanotube arrays （TiO2NTs） by sequential chemical bath deposition method （S-CBD）. The as-prepared CdS/TiO2NTs was characterized by field-emission scanning electron mi- croscopy （FE-SEM） and X-ray diffraction （XRD）. The results indicated that the CdS nanoparticles were effectively deposited on the surface of TiOeNTs. The amperometric I-t curve on the CdS/TiO2NTs electrode was also presented. It was found that the photocurrent density was enhanced significantly from 0.5 to 1.85 mA/cm2 upon illumination with applied potential of 0.5 V at the central wavelength of 253.7 nm. The photoelectrocatalytic （PEC） activity of the CdS/TiO2NTs electrode was investigated by degradation of methyl orange （MO） in aqueous solution. Compared with TiO2NTs electrode, the degradation efficiencies of CdS/TiO2NTs electrode increased from 78% to 99.2% under UV light in 2 h, and from 14% to 99.2% under visible light in 3 h, which was caused by effective separation of the electrons and holes due to the effect of CdS, hence inhibiting the recombination of electron/hole pairs of TiO2NTs.
基金financially supported by the Zhejiang Provincial Natural Science Foundation of China(Nos.LY18B060003,LR18B070001,and LY16B060001)the National Natural Science Foundation of China(Nos.21576237,21876154 and 21477114)Graduate Innovation Foundation of Zhejiang Gongshang University(No.1260KZN0217059G)。
文摘A new electrochemically-modified BiVO_(4)-MoS_(2)-Co_(3)O_(4)(represented as E-BiVO_(4)-MoS_(2)-Co_(3)O_(4))thin film electrode was successfully synthesized for environmental application.MoS_(2)and Co_(3)O_(4)were grown on the surface of Bi VO 4 to obtain BiVO_(4)-MoS_(2)-Co_(3)O_(4).E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)film was achieved by further electrochemical treatment of BiVO_(4)-MoS_(2)-Co_(3)O_(4).The asprepared E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)exhibited significantly enhanced photoelectrocatalytic activity.The photocurrent density of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)thin film is 6.6 times that of Bi VO 4 under visible light irradiation.The degradation efficiency of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)for bisphenol A pollutant was 81.56%in photoelectrochemical process.The pseudo-first order reaction rate constant of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)film is 3.22 times higher than that of Bi VO 4.And its reaction rate constant in photoelectrocatalytic process is 14.5 times or 2 times that in photocatalytic or electrocatalytic process,respectively.The improved performance of E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)was attributed to the synergetic effects of the reduction of interfacial charge transfer resistance,the formation of oxygen vacancies and sub-stoichiometric metal oxides and higher separation efficiency of photogenerated electron-hole pairs.E-BiVO_(4)-MoS_(2)-Co_(3)O_(4)is a promising composite material for pollutants removal.
基金This work was supported by the National Key Research and Development Program of China(Nos.2018YFE0122300 and 2018YFB1502001)Shanghai International Science and Technology Cooperation Fund Project(No.18520744900)and the SJTU-AMED.
文摘In this paper,a photoelectrocatalytic(PEC)recovery of toxic H_(2)S into H_(2)and S system was proposed using a novel bismuth oxyiodide(BiOI)/tungsten trioxide(WO_(3))nano-flake arrays(NFA)photoanode.The BiOI/WO_(3)NFA with a vertically aligned nanostructure were uniformly prepared on the conductive substrate via transformation of tungstate following an impregnating hydroxylation of BiI3.Compared to pure WO_(3)NFA,the BiOI/WO_(3)NFA promotes a significant increase of photocurrent by 200%.Owing to the excellent stability and photoactivity of the BiOI/WO_(3)NFA photoanode and I-/I-3 catalytic system,the PEC system toward splitting of H_(2)S totally converted S_(2)-into S without any polysulfide(Sn-x)under solar-light irradiation.Moreover,H_(2)was simultaneously generated at a rate of about 0.867 mL/(h·cm).The proposed PEC H_(2)S splitting system provides an efficient and sustainable route to recover H_(2)and S.
基金Sponsored by the National Natural Science Foundation of China ( Grant No 50678044)
文摘In this study,sulfur-doped TiO2 /Ti photoelectrodes were prepared by anodization. The morphology, crystalline structure,composition of sulfur-doped TiO2 /Ti film and light absorption property were examined by SEM,XRD,XRF,XPS and UV/VIS respectively. Dimethyl phthalate( DMP) ,one kind of environmental disrupting chemicals( EDCs) ,was degraded by the optimized photoelectrodes. Power of xenon light,initial concentration of DMP,photoelectrocatalytic( PEC) area of photoelectrode and bias were investigated in the study on kinetics of PEC degradation of DMP. Hence,this study concluded that the optimum conditions were power of xenon light 150 W,initial concentration of DMP 1 mg/L,PEC area of sulfur-doped TiO2 /Ti photoelectrode 10 cm2,bias 1. 3 V in the PEC reaction system.
