A green advanced oxidation (AO) strategy to destroy dye pollutants and remove them from aquatic environments is to utilize sunlight and employ thin-film semiconducting photo-reactors. In this light-driving AO method, besides the type of dye and semiconductor material, attention to the electrostatic interactions between dye and electrode is of great importance. In this paper, a couple of nanostructured, narrow-bandgap, semiconducting photoelectrodes, i.e., hematite (n-type) and pyrite (p-type) were fabricated electrochemically and employed for the elimination of two cationic (malachite green) and anionic (methyl orange) dyes inside a single-electrode photoreactor. It was shown that without applying a faradic potential bias and consuming electricity or changing the pH of medium, the decolorization ability of the fabricated photoelectrodes can be substantially boosted just by their connection to an electrostatic (non-faradic) bias source. Regardless of the type of photoelectrode, in the case of cationic dye, the application of a negative polarity and for the anionic dye, a positive polarity remarkably promoted the reactor activity. These observations were discussed in detail through electrostatic attractive/repulsive forces between ionic dyes and charged photoelectrodes, and finally a mechanistic perspective was put forward for the photo-electrostatic dye removal process.

一种破坏染料污染物并将其从水生环境中去除的绿色高级氧化 (AO) 策略是利用阳光并使用薄膜半导体光反应器。在这种光驱动 AO 方法中，除了染料和半导体材料的类型外，注意染料与电极之间的静电相互作用也非常重要。在本文中，电化学制造了一对纳米结构、窄带隙、半导体光电极，即赤铁矿（n 型）和黄铁矿（p 型），并用于消除两种阳离子（孔雀石绿）和阴离子（甲基）橙色）染料在单电极光反应器内。结果表明，在不施加法拉第电位偏压和耗电或改变介质 pH 值的情况下，制造的光电极的脱色能力可以通过连接到静电（非法拉第）偏置源而大大提高。无论光电极的类型如何，在阳离子染料的情况下，负极性的应用和阴离子染料的正极性都显着促进了反应器的活性。通过离子染料和带电光电极之间的静电引力/排斥力详细讨论了这些观察结果，最后提出了光静电染料去除过程的机理观点。正极性显着促进了反应器的活性。通过离子染料和带电光电极之间的静电引力/排斥力详细讨论了这些观察结果，最后提出了光静电染料去除过程的机理观点。正极性显着促进了反应器的活性。通过离子染料和带电光电极之间的静电引力/排斥力详细讨论了这些观察结果，最后提出了光静电染料去除过程的机理观点。