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首页> 外文期刊>Environmental Science & Technology >Porous Substoichiometric TiO_2 Anodes as Reactive Electrochemical Membranes for Water Treatment
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Porous Substoichiometric TiO_2 Anodes as Reactive Electrochemical Membranes for Water Treatment

机译：亚化学计量多孔TiO_2阳极作为用于水处理的反应性电化学膜

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摘要

This research investigates the characterization and testing of an anodic reactive electrochemical membrane (REM) for water treatment The REM consists of a porous substoichiometric titanium dioxide (Ti_4O_7) tubular, ceramic electrode operated in cross-flow filtration mode. Advection-enhanced mass transfer rates, on the order of a 10-fold increase, are obtained when the REM is operated in filtration-mode, relative to a traditional Sow-through mode. Oxidation experiments with model organic compounds showed that the REM was active for both direct oxidation reactions and formation of hydroxyl radicals (OH~•). Electrochemical impedance spectroscopy data interpreted by transmission line modeling determined that the electro-active surface area was 619 times the nominal geometric surface area. Results from filtration-mode experiments with p-methoxyphenol indicate that compound removal occurred by electro-assisted adsorption and subsequent oxidation. Electro-assisted adsorption was the primary removal mechanism at potentials where OH~• did not form. At higher potentials (>2.0 V), where OH~• concentrations were significant, p-methoxyphenol removal occurred by a combination of electro-assisted adsorption and OH~• oxidation. These removal mechanisms resulted in 99.9% p-methoxyphenol removal in the permeate, with calculated current efficiencies >73% at applied current densities of 0.5-1.0 mA cm~(-2). These results illustrate the extreme promise of the REM for water treatment.
机译：这项研究调查了用于水处理的阳极反应电化学膜（REM）的表征和测试。REM由多孔亚化学计量的二氧化钛（Ti_4O_7）管状陶瓷电极组成，该电极在错流过滤模式下运行。与传统的Sow-through模式相比，当REM在过滤模式下运行时，对流增强的传质速率提高了约10倍。模型有机化合物的氧化实验表明，REM对直接氧化反应和羟基自由基（OH〜•）均具有活性。通过传输线建模解释的电化学阻抗谱数据确定电活性表面积为标称几何表面积的619倍。对甲氧基苯酚的过滤模式实验结果表明，化合物的去除是通过电助吸附和随后的氧化而完成的。在没有形成OH〜•的电势下，电助吸附是主要的去除机理。在较高的电位（> 2.0 V）下，OH〜•浓度很高，电辅助吸附和OH〜•氧化的组合会除去对甲氧基苯酚。这些去除机制导致渗透物中99.9％的对甲氧基苯酚去除，在施加的电流密度为0.5-1.0 mA cm〜（-2）时，计算的电流效率> 73％。这些结果说明了REM在水处理方面的巨大前景。

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  • 来源
    《Environmental Science & Technology》 |2013年第12期|6554-6563|共10页
  • 作者

    Ami M. Zaky; Brian P. Chaplin;

  • 作者单位

    Department of Civil and Environmental Engineering and Villanova Center for the Advancement of Sustainable Engineering, Villanova University, Villanova, Pennsylvania 19085, United States;

    Department of Civil and Environmental Engineering and Villanova Center for the Advancement of Sustainable Engineering, Villanova University, Villanova, Pennsylvania 19085, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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