3D打印气体扩散电极产H2O2及其对焦化废水的处理研究

利用3D打印技术设计出一种高效产H₂O₂的3D打印气体扩散电极（3D-GDE）并将其应用于电芬顿体系对实际焦化废水降解研究.结果表明3D-GDE阴极H₂O₂产量高达16.1mg H₂O₂/cm²，而相同条件下传统气体扩散电极仅为7.16mg H₂O₂/cm².通过考察不同因素对阴极产H₂O₂影响可知：酸性条件更有利于产H₂O₂；电流从200mA提高到250mA，其H₂O₂产量从250mg/L提高到450mg/L，但是继续提高电流时（250~300mA），H₂O₂并没有明显增加.将3D-GDE电极应用于电芬顿对实际焦化废水处理，在最适宜条件下，可以实现对焦化废水有效矿化（4h电解后高达80%），其降解过程中三维荧光指纹分析也直接证明了该体系的高效性.Microtox毒性实验表明，3D-GDE电芬顿体系可以有效的降低焦化废水体系的毒性，其最低能耗为0.9kW·h/g TOC.

Enhancement of H2O2 accumulationat gas diffusion electrodes (GDEs) optimized by 3D-printed technique and its utilization in electro-Fenton for coking wastewater treatment

In this study, 3D-printed GDE (3D-GDE) with a high H₂O₂ generation rate was designed using a three-dimensional printing approach and its application in electro-Fenton for coking wastewater treatment. Results showed that H₂O₂ reached 16.1mg H₂O₂/cm², which was superior to the conventional gas diffusion electrode in the absence of the 3D-printedstructure with 7.16mg H₂O₂/cm² H₂O₂ capacity under the same conditions. Moreover, it showed acid condition was favorable for the H₂O₂ production, and H₂O₂ generation rose from 250mg/L to 450mg/L as current increased from 200mA to 250mA. However, a further enhancement in current failed to improve H₂O₂ generation capacity. The proposed system was used for coking wastewater treatment following the optimization of the operating factors. Mineralization rate of coking wastewater could reach as high as 80% in 4h electrolysis by the 3D-GDE electro-Fenton process. Moreover, three-dimensional fluorescence method confirmed the effectiveness of the process in a direct approach. Microtox toxicity results revealed that the 3D-GDE electro-Fenton process was effective for coking wastewater detoxification and the lowest energy consumption for coking wastewater was calculated as 0.9kW·h/g TOC.