Nitrogen-doped Diamond Electrode Property and Anodic Catalytic Degradation of Nitrobenzene

doi:10.15541/jim20170290

Abstract

Abstract:

A series of nitrogen-doped diamond (NDD) film electrodes were synthesis by hot cathode direct current plasma chemical vapor deposition (HCDCPCVD) method with varied ratio CH₄/H₂/N₂ gas mixture. Morphologies of diamond films were characterized by SEM. Electrical and electrochemical properties of nitrogen-doped diamond electrodes were characterized by Hall test and cyclic voltammetry. The results show that when the nitrogen flow rate is less than 30 sccm, the conductivity of the film increases slightly with the increase of the nitrogen flow rate. As the nitrogen flow rate continues to increase, the conductivity decreases rapidly, showing the maximum electro- conductibility of 5.091 S/cm. The nitrogen-doped diamond electrode has good voltammetric performance with a wide potential window and a low background current in acidic, neutral and alkaline media. Properties of anodic oxidation degradation of nitrogen-doped diamond electrodes were tested using nitrobenzene as target pollutant. In the supporting electrolyte of 0.1 mol/L Na₂SO₄ solution, 0.5 mmol/L nitrobenzene is decomposed using the nitrogen- doped diamond as anode. After reaction for 300 min, degradation rate of the nitrobenzene reaches 94%, and COD (Chemical Oxygen Demand) removal rate is about 68%.

Key words: hot cathode direct current glow plasma chemical vapor deposition, nitrogen-doped submicron-crystalline diamond electrode, electrocatalytic oxidation, nitrobenzene degradation

CLC Number:

O646

YAN Shi-Sheng, PENG Hong-Yan, ZHAO Zhi-Bin, PAN Meng-Mei, YANG Da-Li, A Jin-Hua, YE Guo-Lin, WANG Chong-Tai, GUO Xin-Wei. Nitrogen-doped Diamond Electrode Property and Anodic Catalytic Degradation of Nitrobenzene[J]. Journal of Inorganic Materials, 2018, 33(5): 565-569.

Figures/Tables 6

Fig.1 SEM images of diamond films deposited at different N2 flux rates(a) 0 sccm; (b) 10 sccm; (c) 20 sccm; (d) 30 sccm; (e) 40 sccm; (f) 50 sccm

Fig. 2 Electrical conductivity of diamond films deposited at different N2 flux rates

Fig. 3 Cyclic voltammogram of the NDD electrodes deposited at different N2 flux rates (0.1 mol/L Na2SO4; scan rate: 100 mV∙s-1)(b) 10 sccm; (c) 20 sccm; (d) 30 sccm; (e) 40 sccm; (f) 50 sccm

Fig. 4 Cyclic voltammogram of sample c electrode in different electrolytic solutions at scan rate of 100 mV/s(1) 0.1 mol/L Na2SO4-NaHSO4, pH 2.2; (2) 0.1 mol/L Na2SO4, pH 7.0; (3) 0.1 mol/L Na2CO3-NaHCO3, pH 9.4

Fig. 5 Anodically catalyzed degradation curves of NB at NDD electrodes (sample c, d, e)(0.1 mol/L Na2SO4 solution. [NB]=0.5 mmol/L, E=2.8 V)

Fig. 6 Anodically catalyzed degradation curve of COD at electrode of sample c

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