Investigations On Preparation And Electrochemica Oxidation Alizarin Red Of Boron-doped Diamond Film Electrode On Porous Ti Substrate

In recent years, as a new electrode material with low background current, wide potential window, high oxygen evolution potential and corrosion stability, boron-doped diamond (BDD) film electrode has attracted growing concern in electrochemical degradation organic wastewater applications. Titanium as the substrate material for BDD electrode has many unique properties:good electrical conductivity, high mechanical strength, cheap and acid and alkali resistance. Besides above advantages, the porous Ti has also possessed a rather high specific surface area. In this study, the porous Ti has been used as electrode substrates to prepare BDD electrodes, and the properties and their application to organic wastewater treatment has been studied.Boron doped diamond films on porous Ti substrates were prepared by hot-filament chemical vapor deposition(HFCVD), on the basis of hydrogen flow and the boron flow at a constant value, the influence of methane flow, gas pressure and reaction time upon the morphology and quality of BDD films were studied by SEM, XRD and Raman spectroscopy. The results showed the electrodes had good crystalline quality, and the substrates can be completely covered where include the surfaces, bottoms and walls in the pores was prepared on porous Ti with methane flow3sccm, gas pressure4kPa and reaction time5h. The properties of porous Ti/BDD electrodes are tested by electrochemical measurement, it showed that the porous Ti/BDD electrodes have wide potential window3.4V.Finally as model pollutants the Alizarin Red electrochemical oxidation behavior has been studied with porous Ti/BDD electrode under acidic conditions by cyclic voltammetry. The effects of electrochemical oxidation degradation are investigated by changing the pH, anodic current density, the supporting electrolyte and the concentration of supporting electrolyte. The results show that the pH2, anodic current density40mA·cm-2, supporting electrolyte Na2SO4and the concentration0.5M is the ideal technological parameters and the general current efficiency is30.2%. The results of UV-visible spectroscopy detection confirm that Alizarin Red can be degraded efficiently by electrochemical oxidation. The result showed that the porous Ti/BDD film electrode electrochemical oxidation Alizarin Red has a higher current efficiency compared with flat Ti/BDD film electrode in the same condition, showing the porous Ti/BDD can more efficient degradation of Alizarin Red. So it will get more application prospects in organic wastewater treatment.