Carbon cloth with polypyrrole (PPy)-encapsulated needle-like Fe₂O₃ nanoarrays (PPy@N-Fe₂O₃@CC) was grown and tested as an electro-Fenton cathode for roxarsone degradation. The multifunctional cathode was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and more. At an initial pH of 4.0, cathodes coated with PPy degraded roxarsone 3.5 times faster than uncoated cathodes (N-Fe₂O₃@CC). This significant enhancement was attributed to the conducting effect of PPy, which can bridge the electronic channel between Fe₂O₃ and the carbon cloth, which is convenient for the electro-reduction of Fe(III) to Fe(II). Little iron leached from the electrode due to the protective effect of the PPy layer. After five reaction cycles, the PPy@N-Fe₂O₃@CC cathode could still reach at least 93% roxarsone degradation. The effects of applied current and pH on the degradation of roxarsone were also investigated. The result of high-performance liquid chromatography-hydride generation-atomic fluorescence spectrometry (HPLC-HG-AFS) showed that roxarsone was degraded to As(V). This work demonstrates that an electro-Fenton system using PPy@N-Fe₂O₃@CC as a cathode is promising for organic wastewater treatment.

中文翻译：

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在碳布上构建PPy封装的针状Fe2O3纳米阵列作为电子Fenton阴极，以高效降解洛克沙酮

生长具有聚吡咯（PPy）封装的针状Fe ₂ O ₃纳米阵列（PPy @ N-Fe ₂ O ₃ @CC）的碳布，并作为电Fenton阴极进行洛沙酮降解测试。多功能阴极的特征在于扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射（XRD）等。在初始pH为4.0时，涂有PPy的阴极降解的roxarsone的降解速度是未涂覆的阴极（N-Fe ₂ O ₃ @CC）的3.5倍。这种显着增强归因于PPy的导电作用，它可以桥接Fe ₂ O ₃之间的电子通道。碳布，方便将Fe（III）电还原为Fe（II）。由于PPy层的保护作用，几乎没有铁从电极中浸出。经过五个反应循环后，PPy @ N-Fe ₂ O ₃ @CC阴极仍可达到至少93％的洛沙酮降解。还研究了施加的电流和pH值对罗沙酮降解的影响。高效液相色谱-氢化物发生-原子荧光光谱法（HPLC-HG-AFS）的结果表明，洛克沙酮被降解为As（V）。这项工作证明了使用PPy @ N-Fe ₂ O ₃的电子芬顿系统@CC作为阴极有望用于有机废水处理。