Water Sci Technol. 2019 Dec;80(12):2412-2421. doi: 10.2166/wst.2020.072.
Based on graphite felt (GF), the cathode of an electro-Fenton (EF) system was modified by HNO and KOH respectively to improve the degradation efficiency for actual landfill leachate. The results of Fourier transform infrared spectroscopy (FTIR) spectra, Boehm titration experiments, contact angle, scanning electron microscopy (SEM) and adsorption experiments illustrated that the surface of the modified GFs had more oxygen-containing functional (OG) groups, and possessed better hydrophilicity and larger specific surface area. In 180 min HO electrogeneration experiments, the cumulative amount of HO produced by unmodified GF (GF-0), HNO modified GF (GF-1) and KOH modified GF (GF-2) was 526 mg/L, 891 mg/L and 823 mg/L respectively. In 180 min EF reaction, the removal rate of chemical oxygen demand (COD) in GF-0, GF-1 and GF-2 EF systems was 31.88%, 60.65% and 52.08% respectively; the removal rate of NH -N in GF-0, GF-1 and GF-2 EF systems was 43.37%, 98.10% and 94.81% respectively. In addition, both the performance of GF-1 and GF-2 for Fe regeneration was greatly enhanced, and GF-1 was superior to GF-2. The degradation efficiency for landfill leachate was enhanced obviously by employing the modified EF system, suggesting that the two modified cathodes have great potential in practical production.
基于石墨毡（GF），分别用 HNO 和 KOH 对电芬顿（EF）系统的阴极进行改性，以提高实际垃圾渗滤液的降解效率。傅里叶变换红外光谱（FTIR）谱、Boehm 滴定实验、接触角、扫描电子显微镜（SEM）和吸附实验的结果表明，改性 GF 的表面含有更多含氧官能团（OG），具有更好的亲水性和更大的比表面积。在 180 分钟的 HO 电生成实验中，未改性 GF（GF-0）、HNO 改性 GF（GF-1）和 KOH 改性 GF（GF-2）产生的 HO 累积量分别为 526、891 和 823mg/L。在 180 分钟的 EF 反应中，GF-0、GF-1 和 GF-2 EF 系统中化学需氧量（COD）的去除率分别为 31.88%、60.65%和 52.08%；GF-0、GF-1 和 GF-2 EF 系统中 NH-N 的去除率分别为 43.37%、98.10%和 94.81%。此外，GF-1 和 GF-2 的 Fe 再生性能均得到显著增强，且 GF-1 优于 GF-2。改性 EF 系统明显提高了垃圾渗滤液的降解效率，表明这两种改性阴极在实际生产中具有很大的应用潜力。
