Research On Electrochemical Properties Of Niobium-boron-doped Diamond Film Electrode And Petrochemical Wastewater Treatment

Compared to conventional electrolysis electrodes, Boron doped diamond has several technologically important characteristics.as good conductivity, wide potential window,low background current, electrochemical stability and a series of important features, as well as in electrolysis of water treatment has broad application prospects. Choose Guangzhou petrochemical wastewater as the experimental materials,of which the electrochemical properties and degradation technology and the electrochemical capabilities of BDD (Boron doped diamond) were investigated. The main results of this paper are as follow:1. Boron-doped diamond film electrode (BDD) applica-tion in electrochemical preparation and electrochemical oxidation mechanism. Meanwhile,used electrochemical research means (SEM) on Nb/BDD, image indicates that:moderation of boron doping conducive to improve diamond film quality, Raman spectrum indicates that the main of samples is of more Crystal diamond components, three curves than a urve at the1334cm-1peak in sharp。2. Electrochemical properties (potential window background and current) of Nb-con taining boron-doped diamond (Nb/BDD) by CV (cyclic voltammetry) testing were investi gated. And the reversibility of Nb-containing boron-doped diamond (Nb/BDD) and catalytic oxidation of organic matter were analyzed.The results of testing Nb-containing boron-doped diamond (Nb/BDD) through CV (cyclic voltammetry) were:Nb/BDD coating electrode cyclic voltammetry curves of phenol in H2SO4solution shows that Nb/BDD electrodes on the catalytic oxidation of phenol with higher capacity, and oxidation process is not reversible.3. Study on the factors of treatment of petrochemical wastewater through boron-doped diamond film electrode (Nb/BDD) such as time, pH, voltage, electrolyte four factors.To index value of COD and ammonia-nitrogen, oil substances and chlorine ions, explore the best conditions.For2hours, pH=6, electrolyte (NaCl) for1g/L, the voltage value of12to the best condition. COD removal rate of63%, ammonia nitrogen removal rate of72%. oil-like substance removal rates for97%.4. In the situation of same factors (electrolytic mass, voltage. pH), by the experimental comparison of electrolytic mass (NaCl and Na2SO4), after research on the experiment, conductivity rate reduced as time increased,it indicates electrolytic mass (NaCl) has played a role in promoting On removal of organic matter.During the electrolyte (NaCl) is gradually increasing, the relative reduction of chloride ion concentration and increased volume removal rate of a small amount of oil, COD and ammonia nitrogen removal rate is higher than adding electrolyte (Na2SO4).5. Analysis effect of initial concentration on the electrodes, electrode effect on phenol treatment and phenol in the electrode reaction mechanism. Degradation of phenol have a better effect, reached about90%, and COD removal efficiency is not more than50%. Initial concentration on the electrode reaction is not obvious. As the reaction time increases, phenol and other material in wastewater treatment disappeared.