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Electro-catalytic activity of CeO x modified graphite felt for carbamazepine degradation via E-peroxone process
Frontiers of Environmental Science & Engineering ( IF 6.1 ) Pub Date : 2021-03-15 , DOI: 10.1007/s11783-021-1410-x
Xinyu Wang , Ye Jin , Weirui Chen , Ruini Zou , Jinxin Xie , Yiming Tang , Xukai Li , Laisheng Li

E-peroxone (EP) was one of the most attractive AOPs for removing refractory organic compounds from water, but the high energy consumption for in situ generating H2O2 and its low reaction efficiency for activating O3 under acidic conditions made the obstacles for its practical application. In this study, cerium oxide was loaded on the surface of graphite felt (GF) by the hydrothermal method to construct the efficient electrode (CeOx/GF) for mineralizing carbamazepine (CBZ) via EP process. CeOx/GF was an efficient cathode, which led to 69.4% TOC removal in CeOx/GF-EP process with current intensity of 10 mA in 60 min. Moreover, CeOx/GF had the flexible application in the pH range from 5.0 to 9.0, TOC removal had no obvious decline with decrease of pH. Comparative characterizations showed that CeOx could enhance surface hydrophilicity and reduce the charge-transfer resistance of GF. About 5.4 mg/L H2O2 generated in CeOx/GF-EP process, which was 2.1 times as that in GF-EP process. The greater ozone utility was also found in CeOx/GF-EP process. More O3 was activated into hydroxyl radicals, which accounted for the mineralization of CBZ. An interfacial electron transfer process was revealed, which involved the function of oxygen vacancies and Ce3+/Ce4+ redox cycle. CeOx/GF had the good recycling property in fifth times’ use.



中文翻译:

CeO x改性石墨毡对E-过氧化物处理降解卡马西平的电催化活性

E-peroxone(EP)是从水中去除难降解有机化合物的最有吸引力的AOP之一,但是原位生成H 2 O 2的高能耗和在酸性条件下活化O 3的低反应效率成为了障碍。它的实际应用。在这项研究中,通过水热法将氧化铈负载在石墨毡(GF)的表面上,以构建通过EP工艺矿化卡马西平(CBZ)的高效电极(CeO x / GF)。CeO x / GF是有效的阴极,在60分钟的电流强度为10 mA的情况下,可导致CeO x / GF-EP工艺中69.4%的TOC去除。此外,CeO x/ GF在5.0到9.0的pH范围内均可灵活应用,随着pH的降低,TOC去除率没有明显下降。比较特征表明,CeO x可以增强表面亲水性并降低GF的电荷转移阻力。CeO x / GF-EP工艺产生约5.4 mg / LH 2 O 2,是GF-EP工艺的2.1倍。在CeO x / GF-EP工艺中也发现了更大的臭氧效用。更多的O 3被活化为羟基自由基,这是CBZ矿化的原因。揭示了界面电子转移过程,该过程涉及氧空位和Ce 3+ / Ce 4+的功能。氧化还原循环。CeO x / GF第五次使用具有良好的循环利用性能。

更新日期:2021-03-17
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