Electrocatalytic degradation of azo dye RBK5 by sulfur-doped graphene

doi:10.16085/j.issn.1000-6613.2019-0493

Abstract

Abstract:

Graphene oxide (GO) was prepared by modified Hummers method. Sulfur-doped graphene (SG) was synthesized by a one-step annealing method using diphenyl disulfide (BDS) as precursor in carbon monoxide (CO) atmosphere. The microstructure and morphology of the samples were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (Raman) and X-ray photoelectron spectroscopy (XPS). Electrochemical impedance technique was used to test the conductivity of heteroatom-doped graphene and the electrocatalytic performance of sulfur-doped graphene was studied by using RBK5 as target pollutant. The results showed that S-doped graphene had higher conductivity and catalytic activity than pure graphene. When the annealing temperature was 400℃ and S∶C (mass ratio)=1.31, the obtained sulfur-doped graphene (400℃-SG-1.31) had the best degradation effect on the azo dye RBK5. At an initial concentration of 5mg/L, a current density of 20mA, and an initial pH of 3.0, 99% of RBK5 degradation efficiency can be achieved within 20min.

Key words: sulfur-doped graphene, electrocatalytic oxidation, azo dye

摘要：

采用改进的Hummers方法制备氧化石墨烯（GO），以二苯二硫醚（BDS）为掺杂剂，在一氧化碳（CO）氛围下，采用一步退火法合成硫掺杂石墨烯（SG）。通过透射电子显微镜（TEM）、傅氏转换红外线光谱分析（FTIR）、拉曼光谱（Raman）、X射线光电子能谱（XPS）等对样品的微观结构和形貌进行表征，利用电化学阻抗技术测试杂化后石墨烯电导性能，以RBK5为目标污染物进行硫掺杂石墨烯电催化性能研究。研究结果显示，经S掺杂后的石墨烯具有高于纯石墨烯的导电能力与催化活性，当退火温度为400℃且S∶C（质量比）=1.31时，得到的硫掺杂石墨烯（400℃-SG-1.31）在初始pH为3.0时对偶氮染料RBK5的降解效果最好。在初始浓度5mg/L，电流密度为20mA，初始pH为3.0条件下，反应20min即可达到99%的RBK5降解效率。

关键词: 硫掺杂石墨烯, 电催化氧化, 偶氮染料

CLC Number:

Bingxin WANG,Yongbo YU,Wan HUANG,Junming HONG,Qian ZHANG. Electrocatalytic degradation of azo dye RBK5 by sulfur-doped graphene[J]. Chemical Industry and Engineering Progress, 2019, 38(12): 5471-5477.

王冰鑫,于永波,黄湾,洪俊明,张倩. 硫掺杂石墨烯电催化降解偶氮染料RBK5[J]. 化工进展, 2019, 38(12): 5471-5477.

Figures/Tables 9

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