Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
J Hazard Mater. 2015 May 15;288:97-103. doi: 10.1016/j.jhazmat.2015.02.024. Epub 2015 Feb 10.
In this study, we developed a novel photo-electrochemical catalytic oxidation wastewater treatment system by interacting the cathodic in-situ generated H₂O₂ with TiO₂ suspension to form interfacial ≡ Ti(IV)OOH species, which endowed the PEC system with superior efficiency for degrading sodium pentachlorophenate (PCP-Na) under visible light irradiation at neutral pH. The apparent PCP-Na degradation rate constant of the PEC system was more than 10 times that of the electrochemical oxidation counterpart. In the PEC system, the interfacial ≡ Ti(IV)OOH species injected electrons to the conduction band of TiO₂ to initiate the activation of O₂ and the in-situ generated H₂O₂ adsorbed on the surface of TiO₂, lead to producing reactive oxygen species of superoxide anions and hydroxyl radicals, which were responsible for the dechlorination and mineralization of PCP-Na during the PEC process, respectively. The dosage of TiO₂ catalyst and the current intensity applied on PCP-Na degradation were optimized. This study develops a high efficient PEC oxidation system for wastewater treatment and provides new insight into the role of cathodic in-situ generated H₂O₂ on PEC oxidation of PCP-Na with TiO₂ under visible light irradiation.
在这项研究中，我们开发了一种新型光电化学催化氧化废水处理系统，通过将阴极原位生成的 H₂O₂与 TiO₂ 悬浮液相互作用，形成界面 ≡ Ti(IV)OOH 物种，使 PEC 系统在中性 pH 值下的可见光照射下具有优越的降解五氯酚酸钠（PCP-Na）的效率。PEC 系统中，界面 ≡ Ti(IV)OOH 物种向 TiO₂ 的导带注入电子，引发 O₂ 的活化，以及原位生成的 H₂O₂ 吸附在 TiO₂ 的表面，导致产生超氧阴离子和羟基自由基等活性氧物质，它们分别负责 PEC 过程中 PCP-Na 的脱氯和矿化。优化了 TiO₂ 催化剂的用量和施加在 PCP-Na 降解上的电流强度。本研究开发了一种高效的 PEC 氧化系统，用于废水处理，并为可见光照射下 TiO₂ 阴极原位生成 H₂O₂ 对 PCP-Na 的 PEC 氧化作用提供了新的见解。
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