Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain; Department of Municipal and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, China.
Department of Chemical Sciences, University of Padua, Via Marzolo 1, 35131 Padova, Italy.
J Hazard Mater. 2022 Feb 5;423(Pt A):127005. doi: 10.1016/j.jhazmat.2021.127005. Epub 2021 Aug 22.
The excessive cost, unsustainability or complex production of new highly selective electrocatalysts for HO production, especially noble-metal-based ones, is prohibitive in the water treatment sector. To solve this conundrum, biomass-derived carbons with adequate textural properties were synthesized via agarose double-step pyrolysis followed by steam activation. A longer steam treatment enhanced the graphitization and porosity, even surpassing commercial carbon black. Steam treatment for 20 min yielded the greatest surface area (1248 m g), enhanced the mesopore/micropore volume distribution and increased the activity (E = 0.609 V) and yield of HO (40%) as determined by RRDE. The upgraded textural properties had very positive impact on the ability of the corresponding gas-diffusion electrodes (GDEs) to accumulate HO, reaching Faradaic current efficiencies of ~95% at 30 min. Acidic solutions of β-blocker acebutolol were treated by photoelectro-Fenton (PEF) process in synthetic media with and without chloride. In urban wastewater, total drug disappearance was reached at 60 min with almost 50% mineralization after 360 min at only 10 mA cm. Up to 14 degradation products were identified in the Cl-containing medium.
新型高度选择性析氧电催化剂（尤其是贵金属基催化剂）的成本过高、不可持续或生产复杂，这在水处理领域是一个难题。为了解决这个难题，通过琼脂糖两步热解，随后蒸汽活化，合成了具有适当结构特性的生物质衍生碳。较长的蒸汽处理时间增强了石墨化和孔隙率，甚至超过了商业炭黑。蒸汽处理 20 分钟可获得最大的比表面积（1248 m²/g），增强了中孔/微孔体积分布，并提高了活性（E = 0.609 V）和 HO 的产率（40%），这是通过 RRDE 确定的。升级后的结构特性对相应的气体扩散电极（GDE）积累 HO 的能力有非常积极的影响，在 30 分钟内达到约 95%的法拉第电流效率。β受体阻滞剂醋丁洛尔的酸性溶液在合成介质中进行光电芬顿（PEF）处理，有和没有氯离子。在城市废水中，仅在 10 mA cm 下 360 分钟后，药物就几乎完全消失，达到 60 分钟，总药物消失，矿化率达到 50%。在含氯介质中鉴定出多达 14 种降解产物。
