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O-doped graphitic granular biochar enables pollutants removal via simultaneous H2O2 generation and activation in neutral Fe-free electro-Fenton process
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2021-01-12 , DOI: 10.1016/j.seppur.2021.118327
Wei Zhou 1, 2 , Feng Li 3 , Yanlin Su 1 , Junfeng Li 1 , Shuai Chen 1 , Liang Xie 1 , Siyu Wei 1 , Xiaoxiao Meng 1 , Ljiljana Rajic 4 , Jihui Gao 1 , Akram N Alshawabkeh 2
Affiliation  

H2O2 generation by 2-electron oxygen electroreduction reaction (2eORR) has attracted great attention as an alternative to the industry-dominant anthraquinone process. Electro-Fenton (EF) process, which relies on the H2O2 electrogeneration, is regarded as an important environmental application of H2O2 generation by 2eORR. However, its application is hindered by the relatively expensive electrode materials. Proposing cathode materials with low cost and facile synthetic procedures are the priority to advance the EF process. In this work, a composite cathode structure that uses graphitic granular bamboo-based biochar (GB) and stainless steel (SS) mesh (GBSS) is proposed, where SS mesh functions as current distributor and GB supports synergistic H2O2 electrogeneration and activation. The graphitic carbon makes GB conductive and the oxygen-containing groups serve as active sites for H2O2 production. 11.3 mg/L H2O2 was produced from 2.0 g GB at 50 mA after 50 min under neutral pH without external O2/air supply. The O-doped biochar further increased the H2O2 yield to 18.3 mg/L under same conditions. The GBSS electrode is also effective for H2O2 activation to generate radical dotOH, especially under neutral pH. Ultimately, a neutral Fe-free EF process enabled by GBSS cathode is effective for removal of various model organic pollutants (reactive blue 19, orange II, 4-nitrophenol) within 120 min, and for their partial mineralization (48.4–63.5%). Long-term stability of the GBSS electrode for H2O2 electrogeneration, H2O2 activation, and pollutants degradation were also examined and analyzed. This work offers a promising application for biomass waste for removals of organic pollutants in neutral Fe-free EF process.



中文翻译:

O 掺杂石墨颗粒生物炭可通过在中性无铁电芬顿工艺中同时生成和活化 H2O2 来去除污染物

通过 2 电子氧电还原反应 (2eORR) 生成H 2 O 2作为工业主导的蒽醌工艺的替代品引起了极大的关注。依靠H 2 O 2电产生的Electro-Fenton (EF)工艺被认为是H 2 O 2的重要环境应用由 2eORR 生成。然而,其应用受到相对昂贵的电极材料的阻碍。提出具有低成本和简便合成程序的正极材料是推进 EF 工艺的优先事项。在这项工作中,提出了一种使用石墨颗粒竹基生物炭(GB)和不锈钢(SS)网格(GBSS)的复合阴极结构,其中SS网格用作电流分配器,GB支持协同H 2 O 2电生成和活化. 石墨碳使GB具有导电性,而含氧基团用作H 2 O 2生产的活性位点。11.3 毫克/LH 2 O 2在没有外部 O 2 /空气供应的情况下,在中性 pH 下 50 分钟后在 50 mA 下由 2.0 g GB 生产。O掺杂的生物炭在相同条件下进一步将H 2 O 2产率提高到18.3 mg/L。GBSS 电极对 H 2 O 2活化产生OH也是有效的激进点,尤其是在中性 pH 值下。最终,由 GBSS 阴极启用的中性无铁 EF 工艺可在 120 分钟内有效去除各种模型有机污染物(活性蓝 19、橙色 II、4-硝基苯酚),并使其部分矿化(48.4-63.5%)。GBSS电极用于H 2 O 2电产生的长期稳定性,H 2 O 2还检查和分析了活化和污染物降解。这项工作为生物质废物在中性无铁 EF 工艺中去除有机污染物提供了有前景的应用。

更新日期:2021-01-18
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