Preparation Of Tin-antimony Electrodes Modified By Carbon Nanotubes For Electro-catalytic Oxidation Of Wastewater And Combination With Nanofiltration

Organic wastewater in industry has high toxicity and is bio-refractory, and posesa threat to the living environment of human beings. Electrochemical oxidation, duo tohigh energy efficiency, ease of operation, a fast reaction rate and environmentalcompatibility, has attracted considerable attention for application of treating organicpollutant wastewater. But the service lifetime is short and current efficiency is low.Nanofiltration is an attractive alternatively to many conventional separation processdue to its high level of separation, easy to scale-up possibilities, no disposal problemand unique separation capability. The major defect of NF is membrane fouling andconcentration polarization. In our paper, we combines electro-catalytic oxidation withNF treating organic wastewater to play their respective advantages.A new type of Ti/SnO2-Sb electrode modified with CNT has been fabricatedusing a pulse electro-deposition method. The new electrode was characterized byscanning electron microscopy(SEM), X-ray diffraction(XRD), linear sweepvoltammetry(LSV) and service life. Then we optimized the parameters of preparingelectrodes.We evaluated the applicability of electrochemical degradation of azo dye inaqueous solution on the Ti/SnO2-Sb-CNT electrode using C.I. Acid Red73as arepresentative dye. To the best of our knowledge, there is no systematic study on theelectrochemical oxidation of C.I. AR73. In this study, the electrochemical behaviorof the anode in AR73solution was studied by cyclic voltammetry. The effect ofoperating parameters, including current density, initial dye concentration, initial pHand the type of supporting electrolyte, were investigated systematically, in order toidentify the optical electrochemical conditions which give low energy requirementsand high degradation efficiency. Also, the degradation process and intermediates weremonitored by UV-vis spectroscopy and chromatographic techniques. Then weintroduced Ti/SnO2-Sb-CNT electrode into nanofiltration process, and optimized theoperating parameters. Last, the our study sought to analyze the energy consumptionper unit volume of permeation with electrocatalytic oxidation in NF treating AR73wastewater.In general, the research results that the synergy technology process is a highlyeffective way to treating organic wastewater in industry.