Fabrication Of Antimony-doped Tin Oxide Nanorods Electrode For Wastewater Treatment By Electro-catalytic Oxidation Coupling With Nanofiltration

In the area of wastewater treatment by electro-catalytic oxidation,titanium sheet based antimony doped tin oxide?Ti/SnO₂-Sb?electrode has gained extensive attention due to its excellent performance.In this paper,morphology of catalytic layer was designed,namely titanium sheet based antimony doped tin oxide nanorods?Ti/SnO₂-Sb-NRs?electrode was fabricated,whose catalytic layer had nanostructures.And this electrode was utilized as the anode in the treatment of AR73 simulated dye wastewater.Based on the pulsed electrodeposition process,Ti/SnO₂-Sb-NRs electrode was prepared by hydrothermal synthesis.And then parameters of preparation process for SnO₂-Sb-NRs were optimized in order to compare Ti/SnO₂-Sb-NRs electrode and Ti/SnO₂-Sb electrode by the pulsed electrodeposition.Through scanning electron microscope,X-ray diffractometer,contact angle meter,the physical properties of the electrodes were analyzed.As can be seen,square column structures,whose width was about 70 nm,distributed uniformly on the surface of Ti/SnO₂-Sb-NRs electrode;while particles,which were about 10?m,were on Ti/SnO₂-Sb electrode.Because of the three-dimensional capillary effect caused by SnO₂-Sb-NRs,the webbility of Ti/SnO₂-Sb-NRs electrode was better than that of Ti/SnO₂-Sb electrode.Then,through electrochemical impedance spectroscopy,linear sweep voltammetry,cyclic voltammetry,chronoamperometry,electrochemical performances of the electrodes were researched.Compared with Ti/SnO₂-Sb electrode,Ti/SnO₂-Sb-NRs electrode had lower electrochemical impedance?9.41?vs 25.56??,higher current response,and a certain degree of direct oxidation ability.In addition,accelerated life test revealed that the service life of Ti/SnO₂-Sb-NRs electrode was3.68 times longer than that of Ti/SnO₂-Sb.That is to be say,the stability of Ti/SnO₂-Sb-NRs electrode improved.In the treatment of AR73 by electro-catalytic oxidation,the remove effect to organics of Ti/SnO₂-Sb-NRs electrode was better than that of Ti/SnO₂-Sb electrode.After degradation of 4.5 h,almost all the AR73 was degradated on Ti/SnO₂-Sb-NRs electrode and colour removal rate reached 99.38%.And compared with Ti/SnO₂-Sb electrode,COD removal on Ti/SnO₂-Sb-NRs electrode was higher?88.32%vs70.25%?and about 38.27%energy was saved.In addition,adsorption capacity of Ti/SnO₂-Sb-NRs electrode was stronger.The usage of Ti/SnO₂-Sb-NRs electrode in the wastewater treatment by electro-catalytic oxidation coupling with nanofiltration revealed that Ti/SnO₂-Sb-NRs electrode could enhance the permeate flux and rejection rate of the coupling process further.This study shows that Ti/SnO₂-Sb-NRs electrode is a promising anode in wastewater treatment.