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闫 琪,李 健,朱菊芬,等. 气化渣残炭粒子电极的制备及电催化性能研究[J]. 煤炭科学技术,2024,52(7):248−256. doi: 10.12438/cst.2024-0447
引用本文: 闫 琪,李 健,朱菊芬,等. 气化渣残炭粒子电极的制备及电催化性能研究[J]. 煤炭科学技术,2024,52(7):248−256. doi: 10.12438/cst.2024-0447
YAN Qi,LI Jian,ZHU Jufen,et al. Preparation and electrocatalytic performance of gasification slag residual carbon particle electrode[J]. Coal Science and Technology,2024,52(7):248−256. doi: 10.12438/cst.2024-0447
Citation: YAN Qi,LI Jian,ZHU Jufen,et al. Preparation and electrocatalytic performance of gasification slag residual carbon particle electrode[J]. Coal Science and Technology,2024,52(7):248−256. doi: 10.12438/cst.2024-0447

气化渣残炭粒子电极的制备及电催化性能研究

Preparation and electrocatalytic performance of gasification slag residual carbon particle electrode

  • 摘要: 煤化工产业是我国的经济支柱之一,煤气化渣和气化废水是煤气化过程中产生的废弃物,目前处理方式过于简单,对环境造成很大污染。以微乳液作为捕收剂对煤气化细渣进行浮选,采用工业分析仪、FTIR(傅里叶红外光谱仪)、BET(比表面积测试)、SEM(扫描电子显微镜)、XRD(X射线衍射分析)、Raman(拉曼光谱)、XPS(X射线光电子能谱)等表征手段对残炭进行了理化性质分析,采用CV(循环伏安法)、EIS(电化学交流阻抗谱)测试分析残炭电化学性质,并考察残炭作为粒子电极在三维电化学体系的电化学性能和稳定性,研究了其作为粒子电极的可行性,提出残炭粒子电极去除氨氮机理分析。结果表明:浮选残炭具有较高的比表面积,孔结构以介孔为主,此外,残炭中部分碳因石墨化而展现出一定的导电性,为其在电化学应用方面提供了基础。另外,残炭粒子电催化体系电阻较小,有利于加快电荷转移速率。在相同条件下降解氨氮废水,残炭粒子三维电催化体系比二维电催化体系氨氮去除率高19.82%,其具有一定的催化能力。在残炭粒子电极循环试验中,残炭粒子重复使用5次,氨氮的去除率仅下降了5.3%,这一结果表明残炭粒子电极具有良好的稳定性。开发出一种新型的三维电催化体系中的粒子电极材料,通过系统的表征和性能评估,证明了气化渣残炭粒子电极在提高废水处理效率方面有巨大潜力。残炭粒子电极的开发为气化渣的资源化利用提供了新思路,同时也为废水降解处理技术提供了新方法。

     

    Abstract: Coal chemical industry is one of the economic pillars of China. Coal gasification slag and gasification wastewater are the wastes produced in the process of coal gasification, and the current treatment is too simple and causes great pollution to the environment. In this paper, microemulsion was used as the capture agent for flotation of coal gasification fine slag, and the physicochemical properties of residual charcoal were analysed by means of industrial analyser, FTIR, BET, SEM, XRD, Raman, XPS and other means of characterization, and the electrochemical properties of the residual charcoal were analysed by means of CV, EIS test, and the electrochemical properties and stability of the residual charcoal as a particle electrode in the three-dimensional electrochemical system were examined, and the feasibility of using it as a The feasibility of the residual carbon as a particle electrode was investigated, and the mechanism of ammonia nitrogen removal by the residual carbon particle electrode was proposed to be analysed. The results show that the flotation residual carbon has a high specific surface area, and the pore structure is dominated by mesopores. In addition, some of the carbon in the residual carbon exhibits a certain degree of electrical conductivity due to graphitization, which provides a basis for its electrochemical applications. In addition, the residual carbon particles electrocatalytic system had lower electrical resistance, which was conducive to accelerating the charge transfer rate. The three-dimensional electrocatalytic system of residual carbon particles had 19.82% higher ammonia nitrogen removal rate than the two-dimensional electrocatalytic system under the same conditions of ammonia nitrogen wastewater degradation, and it has certain catalytic ability.In the residual charcoal particle electrode cycling test, the residual charcoal particles were reused for five times, and the removal rate of ammonia nitrogen only decreased by 5.3%, and this result shows that the residual charcoal particle electrode has good stability. In this paper, a novel particle electrode material in a three-dimensional electrocatalytic system is developed, and through systematic characterisation and performance evaluation, it is demonstrated that the residual charcoal particle electrode of gasification slag has great potential in improving the efficiency of wastewater treatment. The development of residual charcoal particle electrode provides a new idea for the resourceful utilisation of gasification slag, and also provides a new method for wastewater degradation treatment technology.

     

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