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Photochemical Anti-Fouling Approach for Electrochemical Pollutant Degradation on Facet-Tailored TiO2 Single Crystals
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-09-25 00:00:00 , DOI: 10.1021/acs.est.7b04105 Chang Liu 1 , Ai-Yong Zhang 1, 2 , Yang Si 1 , Dan-Ni Pei 1 , Han-Qing Yu 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-09-25 00:00:00 , DOI: 10.1021/acs.est.7b04105 Chang Liu 1 , Ai-Yong Zhang 1, 2 , Yang Si 1 , Dan-Ni Pei 1 , Han-Qing Yu 1
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Electrochemical degradation of refractory pollutants at low bias before oxygen evolution exhibits high current efficiency and low energy consumption, but its severe electrode fouling largely limits practical applications. In this work, a new antifouling strategy was developed and validated for electrochemical pollutant degradation by photochemical oxidation on facet-tailored {001}-exposed TiO2 single crystals. Electrode fouling from anodic polymers at a low bias was greatly relieved by the free ·OH-mediated photocatalysis under UV irradiation, thus efficient and stable degradation of bisphenol A, a typical environmental endocrine disrupter, and treatment of landfill leachate were accomplished without remarkable oxygen evolution in synergistic photoassisted electrochemical system. Electrochemical and spectroscopic measurements indicated a clean electrode surface during cyclic pollutant degradation. Such a photochemical antifouling strategy for low-bias anodic pollutants degradation was mainly attributed to the improved electric conductivity and excellent electrochemical and photochemical activities of tailored TiO2 anodic material, whose unique properties originated from the favorable surface atomic and electronic structures of high-energy {001} polar facet and single-crystalline structure. Our work opens up a brand new approach to develop catalytic systems for efficient degradation of refractory contaminants in water and wastewater.
中文翻译：
光化学防污法降解面裁TiO 2单晶上的电化学污染物
氧气释放前，低偏压下难降解污染物的电化学降解表现出高电流效率和低能耗，但其严重的电极污染严重限制了实际应用。在这项工作中，开发了一种新的防污策略，并通过刻面定制的{001}曝光的TiO 2上的光化学氧化对电化学污染物的降解进行了验证。单晶。在紫外线照射下，游离的·OH介导的光催化作用大大减轻了阳极聚合物在低偏压下的结垢现象，从而有效，稳定地降解了典型的环境内分泌干扰物双酚A，并完成了垃圾渗滤液的处理，而没有明显的氧气释放在协同光辅助电化学系统中。电化学和光谱测量表明，在循环污染物降解过程中，电极表面清洁。这种用于低偏压阳极污染物降解的光化学防污策略主要归因于特制的TiO 2的改进的电导率以及出色的电化学和光化学活性。阳极材料，其独特特性源自高能{001}极性小面和单晶结构的良好表面原子和电子结构。我们的工作开辟了一种全新的方法来开发催化系统，以有效降解水和废水中的难熔污染物。
更新日期：2017-09-25
中文翻译：
光化学防污法降解面裁TiO 2单晶上的电化学污染物
氧气释放前，低偏压下难降解污染物的电化学降解表现出高电流效率和低能耗，但其严重的电极污染严重限制了实际应用。在这项工作中，开发了一种新的防污策略，并通过刻面定制的{001}曝光的TiO 2上的光化学氧化对电化学污染物的降解进行了验证。单晶。在紫外线照射下，游离的·OH介导的光催化作用大大减轻了阳极聚合物在低偏压下的结垢现象，从而有效，稳定地降解了典型的环境内分泌干扰物双酚A，并完成了垃圾渗滤液的处理，而没有明显的氧气释放在协同光辅助电化学系统中。电化学和光谱测量表明，在循环污染物降解过程中，电极表面清洁。这种用于低偏压阳极污染物降解的光化学防污策略主要归因于特制的TiO 2的改进的电导率以及出色的电化学和光化学活性。阳极材料，其独特特性源自高能{001}极性小面和单晶结构的良好表面原子和电子结构。我们的工作开辟了一种全新的方法来开发催化系统，以有效降解水和废水中的难熔污染物。
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