In this work, a new activated carbon fiber (ACF) cathode modified with graphitic carbon nitride (g-C₃N₄) was developed, which enables the substantially improved production of H₂O₂ (up to 32.8 mg L⁻¹) with relatively low energy consumption (10.9 kWh kg⁻¹) compared to generation without g-C₃N₄ (4.09 mg L⁻¹). The cathode was analyzed and characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction, and it was proved that the synthesized g-C₃N₄ is a thin layer sheet with a large number of carbon particles and low defect porosity. The cathode manufacturing parameters were optimized, and the influences of H₂O₂ production including the cathode potential, pH value, aeration rate and performance stability were studied. These features improved the production of H₂O₂ by about more than 7 folds when optimized ratio of g-C₃N₄ was used, and the modified cathode kept stable performance of H₂O₂ generation in 5 cycles. Further discussed by linear sweep voltammetry, rotating disk electrode and contact angle analysis, the existence of g-C₃N₄ were found to accelerate the electron transfer rate, is advantageous to the surface of the oxygen reaction, but will not change the two electronic number of oxygen reduction reaction activities, and this leads to enhanced performance of hydrogen peroxide production and the possible mechanism was suggested. Finally, the cathode improve by g-C₃N₄ proved the degradation effect of phenol by photoelectric-Fenton process. Phenol was degraded completely, and 93.8% of the organic carbon was removed, which is more than 1.5 and 5 times the amount achieved using electro-Fenton and photo-Fenton degradation only. In the degradation process of phenol, electrocatalysis and photocatalysis, they were optimized to produce substantial synergistic effect, proving the great potential practical application of organic wastewater treatment.

在这项工作中，开发了一种新的用石墨碳氮化物（gC ₃ N ₄）改性的活性炭纤维（ACF）阴极，该阴极能够显着提高H ₂ O ₂（最高32.8 mg L ^-1）的生产，并且相对较低。能量消耗（10.9千瓦时千克^-1）相比产生而不GC ₃ ñ ₄（4.09毫克的L ^-1）。通过扫描电子显微镜，X射线光电子能谱和X射线衍射对阴极进行分析和表征，并证明了合成的gC ₃ N _4。是具有大量碳颗粒和低缺陷孔隙率的薄层板。优化了阴极的制造参数，研究了H ₂ O _2的产生对阴极电势，pH值，通气速率和性能稳定性的影响。当使用优化比例的gC ₃ N ₄时，这些特征将H ₂ O ₂的产量提高了约7倍以上，并且改性阴极在5个循环中保持了H ₂ O ₂生成的稳定性能。通过线性扫描伏安法，转盘电极和接触角分析进一步讨论了gC ₃ N ₄的存在发现加速电子转移速率，有利于氧反应的表面，但不会改变两个电子数目的氧还原反应活性，这导致过氧化氢生产性能增强，并提出了可能的机理。最后，阴极提高了gC ₃ N ₄光电芬顿法证明了苯酚的降解效果。苯酚被完全降解，并且去除了93.8％的有机碳，这是仅使用电子芬顿和光芬顿降解所达到的1.5倍和5倍以上。在苯酚的降解，电催化和光催化过程中，对它们进行了优化以产生明显的协同作用，证明了有机废水处理的巨大潜在实际应用。