TiO2–x缺陷表面上反应位点的光化学保护，用于电化学水处理,Environmental Science & Technology

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TiO2–x缺陷表面上反应位点的光化学保护，用于电化学水处理
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-06-12 , DOI: 10.1021/acs.est.9b01307
Chang Liu ₁ , Ai-Yong Zhang _{1,

2} , Yang Si ₁ , Dan-Ni Pei ₁ , Han-Qing Yu ₁

Affiliation

电极是用于水和废水处理的电化学过程中的关键。许多非化学计量的金属氧化物是活性电极材料，但由于它们对表面和次表面上的氧空位作为缺陷反应位点的敏感性，因此在强阳极极化下的稳定性较差。在这项工作中，提出了一种新颖的光化学保护策略，以稳定TiO _2–_x上的缺陷反应位。表面和地下用于污染物的长期阳极氧化。利用这种策略，进一步构建了在低阳极偏压下的新型光辅助电化学系统。对于双酚A（BPA）（一种典型的持久性有机污染物）的电化学降解，这种系统在较低的运行成本下显示出高保护能力。发现其出色的光化学保护能力主要归因于有缺陷的TiO _2–_x上的温和非带隙激发途径。电极在可见光照射和中等阳极极化的作用下。在真实的阳光照射下，针对BPA降解进行的20次运行循环测试表明，所构建的系统在低偏压下具有出色的性能和稳定性，而没有明显的氧气释放。我们的工作为利用有缺陷和反应性的TiO _{2– x}提供了新的机会，借助其光和电化学双功能特性，可以对其进行高效，稳定和经济高效的电化学水处理。

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Photochemical Protection of Reactive Sites on Defective TiO2–x Surface for Electrochemical Water Treatment

The electrode is the key in electrochemical process for water and wastewater treatment. Many nonstoichiometric metal oxides are active electrode materials but have poor stability under strong anodic polarization due to their susceptible nature of the oxygen vacancies on surface and subsurface as defective reactive sites. In this work, a novel photochemical protecting strategy is proposed to stabilize the defective reactive sites on the TiO_2–x surface and subsurface for long-term anodic oxidation of pollutants. With this strategy, a novel photoassisted electrochemical system at low anodic bias is further constructed. Such a system exhibits a high protecting capacity at a low operation cost for electrochemical degradation of bisphenol A (BPA), a typical persistent organic pollutant. Its excellent photochemical protecting capacity is found to be mainly attributed to the mild non-band-gap excitation pathways on the defective TiO_2–x electrode under both visible-light irradiation and moderate anodic polarization. Under real sunlight irradiation, a 20 run cyclic test for BPA degradation demonstrates the excellent performance and stability of the constructed system at low bias without significant oxygen evolution. Our work provides a new opportunity to utilize the defective and reactive TiO_2–x for efficient, stable, and cost-effective electrochemical water treatment with the aid of its photo- and electrochemical bifunctional properties.

更新日期：2019-06-12

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