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2022 1

2015 1

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同轴管式电极 1

放大 1

氯酚类污染物 1

活性膜电极 1

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Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO

Jiangkun DU,Jianguo BAO,Wei HU

《环境科学与工程前沿（英文）》 2015年第9卷第5期页码 919-928 doi: 10.1007/s11783-015-0794-x

摘要： In this study, palladium-loaded titania nanotubes was fabricated on a titanium plate (Pd/TiO NTs/Ti) for efficient electrodechlorination of 2,4-chlorophenol with a mild pH condition. The nature of Pd/TiO NTs/Ti electrodes was characterized by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) techniques. The characterization results indicated the generation of Pd nanoparticles which were evenly dispersed on titania nanotubes arrays on the Pd/TiO NTs/Ti surface. An effective degradation efficiency of up to 91% was achieved within 60 min at cathode potential of −0.7 V ( SCE) and initial pH of 5.5. The effects of the applied cathode potential and initial pH on the degradation efficiency were studied. A near neutral condition was more favorable since very low and very high pHs were not conducive to the dechlorination process. Furthermore, the intermediates analysis showed that the Pd/TiO NTs/Ti electrode could completely remove chlorine from 2, 4-dichlorophenol since only phenol was detected as the byproduct and the concentration of released chlorine ions indicated near-complete dechlorination. This work presents a good alternative technique for eliminating persistent chlorophenols in polluted wastewater without maintaining strong acidic environment.

关键词： Pd/TiO₂NTs/Ti cathode chlorophenols electrocatalytic dechlorination wastewater treatment

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电活性膜去除氯酚污染物——面向工程应用的放大策略 Article

裴姝钊, 王毅, 尤世界, 李战国, 任南琪

《工程（英文）》 2022年第9卷第2期页码 77-84 doi: 10.1016/j.eng.2021.11.017

摘要：

氯酚（CP）是一类重要的难降解污染物，对人类和其他生物具有高度毒性。电活性膜（REM）通过穿流式操作，能够强化对流传质，在电化学去除难降解污染物过程中彰显出巨大潜力。然而相关研究通常报道的是实验室规模，无法直接保证REM反应器在工程化放大中的成功运行。本研究证明了由亚氧化钛陶瓷阳极和不锈钢阴极配置的同轴管式电极（TCE）可用于大规模的CP 去除。理论和试验结果均表明，TCE构型不仅使电极表面处处正交于电场线，而且具有与电极长度成反比的欧姆电阻。此外，TCE构型可根据废水流动方向将从阳极流向阴极（AC模式）调整为从阴极流向阳极（CA模式），为CP的选择性降解创造了可控条件。单程穿流实验结果证实在CA模式下，2,4-二氯苯酚（2,4-DCP）的去除动力学常数较AC模式高一个数量级，2,4-DCP 和化学需氧量（COD）去除率分别为98%和72.5%。理论计算和实验结果表明，CA模式具有较低的反应活化能和自由能。在不增加欧姆电阻或降低活性面积的情况下，TCE构型适用于组件化策略来放大电化学反应器规模。使用三个TCE组件时，2,4-DCP的去除率达到99.4%，能耗为1.5 kW⋅h⋅m⁻³。本研究为REM反应器提出了一种合理的电极构型设计，为电化学去除氯酚类污染物在跨越面向工程放大的“死亡之谷”提供有效策略。

关键词：氯酚类污染物活性膜电极同轴管式电极放大