Fabrication Of Sb-doped Tin Dioxide Electrode Modified By Cu Nanorods And Its Application In Synergetic Process

As one of the most effective electrode system for wastewater treatment using electrocatalytic oxidation process, high energy consumption, low conductivity and weak electrode stability are still the weak points for large scale application of antimony doped tin dioxide electrodes. What's more, the activity of electrocatalytic oxidation also need further enhanced. In present study, electrode substrate microstructure design has been conducted with high linear ordered Cu nanorods array. Antimony doped tin dioxide electrodes modified by Cu nanorods Ti/Cu-NRs/SnO2-Sb with large specific surface area, high catalytic activity and stability, low charge transfer resistance has obtained through AAO template assited electrodeposition method. Ti/Cu-NRs/SnO2-Sb electrode was then used in the synergetic process of electrocatalytic and nanofiltration. And influence of electrode system differences on water treatment performance of coupling process was investigated.Physical characterization was first used to analyse the morphology and structure of Ti/SnO2-Sb and Ti/Cu-NRs/SnO2-Sb electrodes. From the results of SEM, Cu nanorods distributed on the Ti substrate surface uniformly, and the diameters of copper nanorods are estimated to be about 200-300 nm, the interspace of nanorods reaches 50 nm. The surface morphology of Ti/Cu-NRs/SnO2-Sb electrodes was more uniform and compact, few structure defects were observed. Through XRD test, it is observed that Ti substrate was completely covered, the lattice parameters of catalytic later reduced significantly. Three-dimensional space structure formed by onedimensional ordered nanorods can load more catalyst and provide more sites for organic molecules adsorption and catalyze reaction.Higer oxygen evolution potential for Ti/Cu-NRs/SnO2-Sb electrode was obtained. The specific surface area of Ti/Cu-NRs/SnO2-Sb electrode promoted significantly for the implant of Cu nanorods, and cause a 1.8-fold increase in voltammetric charge. In catalyst layer, Cu nanorods buried in SnO2-Sb layer act as numerous wires, which would shorten the path of charge transfer effectively. From the test results of EIS, the electrochemical resistance of Ti/Cu-NRs/SnO2-Sb electrode was 3.852 ?, only 15.4% of Ti/SnO2-Sb electrode. The stability was also improved because of the presence of Cu nanorods. Acelerated life test results indicates that the accelerated life span of Ti/Cu-NRs/SnO2-Sb electrode was 1.6 times of Ti/SnO2-Sb electrode.During the degrading process of C.I. AR 73, the colour removal of Ti/CuNRs/SnO2-Sb electrode was 10% higher than that of Ti/SnO2-Sb electrode. The existence of Cu nanorods decreased the overall charge transfer resistance, the cell potential of electrolysis process reduced by 0.7V. The specific energy consumption of Ti/Cu-NRs/SnO2-Sb electrode lowered by 24.5% when the colour removal attained 80%. Consequently, the economic rationality in water treatment process enhanced obviously.Ti/Cu-NRs/SnO2-Sb was introduced into the synergetic process of electrocatalytic and nanofiltration for the first time. The introduction of novel electrode caused significantly increase of permeation flux.