| Boron-doped diamond draw attention in various fields as a unique material.It has the diamond material excellent physical and chemical properties,and the conductivity of diamond material has risen because of doping boron.Therefore,it is introduced to the field of electrochemistry as a functional electrode material to study by many specialists.In this paper,BDD material was prepared by hot filament chemical vapor deposition method(HFCVD) method,and it was deposited on silicon. Laser micro-Raman spectrometer,scanning electron microscopy,X-ray diffraction technique,were used to characterize micro-surface morphology and phase composition of the material as the testing methods.Results show that the distribution of diamond particles is continuous,crystalline integrated,growth of grain well.Probe method was used for testing the resistivity of the material,and the result showed the resistivity of the material is less than 0.1Ω·cm,having good electrical conductivity,in full compliance with the basic requirements as an electrode materials. The BDD material is prepared to BDD electrode,and its basic electrochemical test results showed that the BDD electrode material has excellent electrochemical properties,such as in acid medium,the oxygen evolution potential and electric potential window were 2.4V vs.NHE and 3.1V vs.NHE,in neutral medium,the results were 2.1 V vs.NHE and 3.4V vs.NHE,and in alkaline medium,were 1.1 V vs.NHE and 2.9V vs.NHE.The background current is small,chemical stability is good.The cyclic voltammetry graph in potassium ferricyanide solution showed the reaction around electrode surface has good quasi-reversibility. In other solutions such as cyclohexanone,phenol and other organic,the basic electrochemical reaction results showed that the BDD electrode compared to traditional electrodes(such as lead dioxide electrode,graphite electrode) has excellent effect of degradation on organic compounds, especially for cyclic organic compounds.The kinetic parameters of boron-doped diamond film electrode electro-degrading cyclohexanone were tested and the reaction conditions of boron-doped diamond film electrode electro-oxidative degrading of cyclohexanone were optimized by orthogonal test and the best conditions were(1)current density=5mA·cm-2;(2)the initial concentration of cyclohexanone=20mmol·L-1;(3)pH=7;(4)the concentration of supporting electrolyte=12g·L-1,and the removal of COD under the optimum conditions achieved 95.1%,and current efficiency was 85.4%.Basic electrochemical research,high-performance liquid chromatography and GC-MS analysis technique were used for analyzing the mechanism of BDD electrode electro-oxidative degrading cyclohexanone.The effect of BDD electrode degrading mixture of cyclohexanone and phenol is also significant,the removal of COD achieved 97.9%,and the current efficiency was 86.86%.Compared to traditional electrode,the results showed that the BDD electrode has a significant advantage of degrading industrial organic wastewater.Cyclic voltammogram curve,AC impedance diagram and the related kinetic parameters of BDD electrode electro-synthesize ferrate were researched by electrochemical tests;and according to related literature,the conditions double-anode electrochemical synthesizing ferrate were optimized by orthogonal test:(1) the concentration of sodium hydroxide= 14mol·L-1;(2)T=10℃;(3)iron electrode electrolysis time=2h;(4) current density=10m·cm-2,under these conditions,the concentration of ferrate is 10.1g·L-1,and the current efficiency is 60.7%.Compared to the traditional synthesizing ferrate,the result showed that the double-anode form is easier to synthesize of ferrate;The reaction process of the BDD electrode electro-synthesis of ferrate were analysed. |
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