從綠能技術的觀點來看的話，一個永續的廢水處理系統是被急迫需求的。因此，我們演示了一種包含了亞甲基藍、赤鐵礦和錳(II)的三元系統，此種方法結合了光電化學和高級氧化程序的優點。透過採用添加錳(II)離子的赤鐵礦光陽極，在通以0.2mA的電流及歷經一小時的光照後，亞甲基藍的去顏色比例達到了C/C0<0.03。和傳統的半導體光降解方法相比，這種方法具有更好的效率，並且避免了過氧化氫的添加。此外，與電催化降解法相比，光電催化法減少了能量的消耗，並且在陰極產生了額外的氫氣能源。最重要的是，這些參雜的Mn(II)可以透過形成非晶像的二氧化錳沉澱而完全分離。具有快速、高效率、可回收、金屬離子去除及經濟層面的競爭性的幾個卓越特點，使我們提出的方法是一種有前景的永續廢水處理方法。

A sustainable wastewater treatment is always highly desired for the perspective of green technology. Herein, we demonstrate a ternary system containing methylene blue, Hematite and Mn2+, which combines the advantages of both PEC and advanced oxidation process (AOP). By adopting hematite as the photoanode with addition of Mn(II) ions, decolorization of methyl blue (C/C0 < 0.03) can be achieved in 1 h with illumination and 0.2 mA applied current. In comparison with traditional semi-conductor photodegradation, this has better efficiency performance and avoid the addition of hydrogen peroxides; Moreover, this reduce energy consumption in comparison with the electrically degradation method and produced additional hydrogen at the cathode. Importantly, spiked Mn(II) can be completely separated by the formation of amorphous MnO2 precipitates. Superior features including fast, efficient, recyclable, simultaneously metal ion removal and economically competitive make our proposed method a promising sustainable wastewater treatment method.

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