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  

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

作　　者：余章俊 王项 邓泽军[1] 马莉[2] 魏秋平[1,2] YU Zhangjun;WANG Xiang;DENG Zejun;MA Li;WEI Qiuping(School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[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

出　　处：《粉末冶金材料科学与工程》2024年第3期221-230,共10页Materials Science and Engineering of Powder Metallurgy

基　　金：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)。

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_(n)O_(2n−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:1050℃/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Ti_(4)O_(7)的含量最高(质量分数为37.5%)、薄膜电荷转移电阻最低(16.75Ω),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)/m^(3))。·OH和SO_(4)^(·-)均参与降解酸性橙G,且·OH和SO_(4)^(·-)对去除酸性橙G的贡献几乎相同。无机离子HCO_(3)^(-)、NO_(3)^(-)、H_(2)P O_(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。Three dimensional foam SiC based titanium suboxide(SiC/Ti_(n)O_(2n−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 1050℃/2 h sintering condition has good quality,continuous and uniform distribution,and the content of conductive phase Ti_(4)O_(7)is the highest(mass fraction is 37.5%),the film charge transfer resistance is the lowest(16.75Ω).It shows a faster degradation rate(reaction rate constant is 0.60 h^(−1))and lower energy consumption(11.63(kW∙h)/m^(3))for simulated pollutant acid orange G.Both·OH and SO_(4)^(·-)gare 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 HCO_(3)^(-),NO_(3)^(-),H_(2)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.

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 

分 类 号：TQ15[化学工程—电化学工业]