Preparation Of A Distinctive Nanostructure Of Sb-doped Tin Dioxide Electrode And Its Application In The Treatment Of Dye Water

In the treatment of dye wastewater by electrocatalytic oxidation,titanium-based tin oxide antimony electrode as an anode material shows excellent electrode performance,and has been favored by researchers at home and abroad.However,such electrodes have much room for improvement in oxygen evolution potential,electrocatalytic performance,and stability.In this paper,firstly,highly ordered Nb doped TiO₂ nanotubes（Nb-TiO₂-NTs）,as a new type of substrate material,was prepared by two times anodization method,and screen printing technology was used to prepare the new nanostructured ATO electrode（Nb-Ti/Nb-TiO₂-NTs/ATONPs）.In this paper,the process parameters of Nb-TiO₂-NTs prepared by two times anodic oxidation method and Nb-Ti/Nb-TiO₂-NTs/ATONPs electrode prepared by screen printing method were optimized.Ordinary screen-printed titanium-based tin antimony electrode（Ti/ATONPs）as a control group.The physical properties were characterized by SEM,EDX and XRD.The results showed that the new electrodes had more regular,uniform catalytic layers and smaller crystals.Particle size is about40nm.With smaller particle size and higher crystallinity,the catalytic particles exhibit a larger specific surface area and reaction sites.The results of electrochemical measurements such as cyclic voltammetry,linear sweep voltammetry,and electrochemical impedance test showed that the new electrode exhibits a higher oxygen evolution potential（2.24V vs.Ag/AgCl）,a larger true active surface area,and good electrical conductivity,with an electrochemical impedance of 0.42?.Through the accelerated life test,the service life of the new electrode was also improved compared to the conventional titanium-based screen printed tin antimony electrode,which was 2.1 times that of the control group.It shows that the introduction of a special new substrate of Nb-TiO₂-NTs structure can improve the stability of the electrode without affecting the conductivity basically.Using the new electrode and the control electrode as anodes to degrade the simulated wastewater AR73 and degraded under the same conditions for 3h.The results showed that the color removal rate and COD removal rate of the new electrode reached 89.6%and 77.0%,respectively.Compared to the control group,the new electrode was increased by 13.2%and 17%,respectively.At the same time,the energy consumption was 10.2Wh·L^-1 and 14.3Wh·L^-1 when the degradation rate reached 80%.The energy consumption decreased by 28.8%.It shows that the new electrode has better degradation performance and economy in dye wastewater treatment.Finally,the new electrode was used to electrocatalytically degrade AR73 dye wastewater.The effects of operating conditions such as current density and initial dye concentration on its degradation performance were investigated.The results showed that when the dye wastewater was degraded,the suitable current density is25mA·cm^-2and the suitable initial dye concentration ranged from 1g·L^-1 to 1.5g·L^-1,which provided reference for actual wastewater treatment.In short,the new Nb-Ti/Nb-TiO₂-NTs/ATONPs electrode is a highly efficient electrocatalytic oxidation degradation anode,and its application prospect is very good.