泡沫SiC基亚氧化钛电极的制备及电催化氧化酸性橙G的性能

余章俊; 王项; 邓泽军; 马莉; 魏秋平

doi:10.19976/j.cnki.43-1448/TF.2024030

粉末冶金材料科学与工程 >

2024 , Vol. 29 >Issue 3: 221 - 230

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2024030

工艺技术

泡沫SiC基亚氧化钛电极的制备及电催化氧化酸性橙G的性能

余章俊 ,
王项 ,
邓泽军 ,
马莉 ,
魏秋平

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1.中南大学材料科学与工程学院,长沙 410083;
2.中南大学粉末冶金国家重点实验室,长沙 410083

收稿日期: 2024-03-29

修回日期: 2024-05-27

网络出版日期: 2024-08-12

基金资助

国家“十四五”重点研究发展计划(2021YFB3701800); 国家自然科学基金资助项目(52202056,52274370,52071345,51874370); 广东省“十三五”重点研究开发项目(2020B01085001); 湖南省高新技术产业科技创新引领计划(2022GK4037,2022GK4047); 湖南省自然科学基金资助项目(2023JJ40722); 粉末冶金国家重点实验室自主课题(621022230)

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Preparation of foam SiC-based titanium suboxide electrode and the performance of electrocatalytic oxidation acid orange G

YU Zhangjun ,
WANG Xiang ,
DENG Zejun ,
MA Li ,
WEI Qiuping

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1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received date: 2024-03-29

Revised date: 2024-05-27

Online published: 2024-08-12

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摘要

采用溶胶-凝胶烧结法制备三维泡沫SiC基亚氧化钛(SiC/Ti_nO₂_n_-1)电极。采用扫描电子显微镜、X射线衍射仪和电化学工作站表征亚氧化钛电极的表面形貌、相组成和电化学性能,利用紫外-可见光分光光度计测试其对有机污染物的降解效果。结果表明：1 050 ℃/2 h烧结制备的泡沫SiC基亚氧化钛电极涂层质量较好,分布连续、均匀,且导电相Ti₄O₇的含量最高(质量分数为37.5%)、薄膜电荷转移电阻最低(16.75 Ω),对模拟污染物酸性橙G表现出更快的降解速率(反应速率常数为0.60 h^-1)和更低的能耗(11.63 (kW·h)/m³)。•OH和$ \mathrm{SO}_{4}^{.-}$均参与降解酸性橙G,且•OH和$ \mathrm{SO}_{4}^{.-}$对去除酸性橙G的贡献几乎相同。无机离子$ \mathrm{HCO}_{3}^{-}$、$ \mathrm{NO}_{3}^{-}$、$ \mathrm{H}_{2} \mathrm{PO}_{4}^{-}$的存在对酸性橙G的降解均具有抑制作用,而Cl^-会促进酸性橙G的降解。电极在多次降解中表现出较高的稳定性。

关键词： 亚氧化钛电极; 泡沫SiC基体; 电化学性能; 废水降解; 电化学氧化

本文引用格式

余章俊 , 王项 , 邓泽军 , 马莉 , 魏秋平 . 泡沫SiC基亚氧化钛电极的制备及电催化氧化酸性橙G的性能[J]. 粉末冶金材料科学与工程, 2024 , 29(3) : 221 -230 . DOI: 10.19976/j.cnki.43-1448/TF.2024030

Abstract

Three dimensional foam SiC based titanium suboxide (SiC/Ti_nO₂_n_-1) electrode was prepared by sol-gel sintering method. The surface morphology, phase composition, and electrochemical property of titanium suboxide electrodes were characterized by scanning electron microscopy, X-ray diffraction, and electrochemical workstation. The degradation effect of organic pollutants was tested using a ultraviolet-visible spectrophotometer. The results show that the coating of foam SiC based titanium suboxide electrode prepared at 1 050 ℃/2 h sintering condition has good quality, continuous and uniform distribution, and the content of conductive phase Ti₄O₇ is the highest (mass fraction is 37.5%), the film charge transfer resistance is the lowest (16.75 Ω). It shows a faster degradation rate (reaction rate constant is 0.60 h^-1) and lower energy consumption (11.63 (kW∙h)/m³) for simulated pollutant acid orange G. Both •OH and $ \mathrm{SO}_{4}^{.-}$ are involved in the degradation of acid orange G, and their contributions to the removal of acid orange G are almost the same. The presence of inorganic ions $ \mathrm{HCO}_{3}^{-}$, $ \mathrm{NO}_{3}^{-}$, $ \mathrm{H}_{2} \mathrm{PO}_{4}^{-}$ has an inhibitory effect on the degradation of acid orange G, while Cl^- promotes the degradation. The electrode exhibits high stability in multiple degradations.

Key words： titanium suboxide electrode; foam SiC matrix; electrochemical property; wastewater degradation; electrochemical oxidation

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