LDH原位电活化阴极实现·OH定向转化用于磺胺甲噁唑降解研究
LDH in-situ electro-activated cathode to achieve ·OH directional conversion for sulfamethoxazole degradation
通过构建钴铁双金属氢氧化物(CoFe-LDH)作为电催化剂实现了原位电催化产活性自由基(·OH),具有高氧化电位的羟基自由基能够有效地攻击污染物分子。LDH基催化剂的二维稳定结构可以减少金属浸出,实现可重复使用。表面—OH基团的存在优化了氧还原(ORR)反应中间体的吸附能,促进ORR反应中O—O键的断裂。即CoFe-LDH在电解过程中更容易产生·OH,避免了电子经过传统2e-—ORR传输通道的技术屏障。因此,通过不同金属原子活性对于活性氧物种(ROS)的转化途径和O2活化机制,并利用磺胺甲 唑(SMX)做为有机污染物探针分子,考察了该材料的ORR效率。此外,利用现代谱学分析,对该材料表面的ORR机理进行解析。研究成果可为在温和条件下利用CoFe-LDH催化·OH的原位产生并高效作用于水中高难有机污染物的降解、矿化提供重要参考。
In-situ electrocatalytic production of active radicals (·OH) is achieved via constructing cobalt-iron bimetallic hydroxide (CoFe-LDH) as an electrocatalyst.Hydroxyl radicals with high oxidation potential are able to attack pollutant molecules effectively.Given two-dimensional stable structure,LDH-based catalysts can reduce metal leaching and achieve reusability.The presence of surface-OH groups optimizes the adsorption energy of oxygen reduction reaction (ORR) intermediates and promotes the cleavage of O-O bonds in ORR.CoFe-LDH is more easily to produce ·OH during the electrolysis process,avoiding the technical barrier suffered by electrons when they pass through the traditional 2e- ORR transmission channel.Therefore,the ORR efficiency of CoFe-LDH material is examined through the conversion pathway of reactive oxygen species (ROS) and the mechanism of O2 activation by different metal atom activities,and using sulfamethoxazole as an organic pollutant probe molecule.In addition,the ORR mechanism on the surface of the material is analyzed by means of modern spectroscopic analysis.The findings can provide an important reference for the in-situ generation of ·OH catalyzed by CoFe-LDH under mild conditions,and its efficient role in the degradation and mineralization of refractory organic pollutants in water.
电催化 / 金属协同 / 羟基自由基 / 氧还原 / 钴铁双金属氢氧化物
electrocatalysis / metal synergy / hydroxyl radicals / oxygen reduction / cobalt-iron bimetallic hydroxides
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昆明理工大学分析测试基金项目(2023M20222110038)
国家自然科学基金项目(52260009)
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