School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Chemosphere. 2022 Feb;289:133046. doi: 10.1016/j.chemosphere.2021.133046. Epub 2021 Dec 6.
In order to overcome the sluggish kinetics of the redox conversion between Fe and Fe in Fenton process, we established a novel electro-Fenton system based on GO-FeO cathode and tannic acid (TA) for the efficient degradation of p-nitrophenol (PNP). Under the optimal degradation parameters (including the initial PNP concentration of 20 mg L, pH = 5, current density of 30 mA cm and feeding ratio of PNP: TA = 1:2), the TA reinforced GO-FeO electro-Fenton system exhibited the removal rate of PNP over 90.1 ± 0.2%, the COD removal rate of 69.5 ± 0.84% and satisfactory reusability (with the removal rate of ∼80% after 5 recycles). The excellent degradation performance of the proposed TA reinforced GO-FeO electro-Fenton system was partly attributed to the optimized morphology (with the particle size of FeO reduced to tens of nanometers, pore size decreased by ∼80% and pore volume increased by 24.3 times) and larger specific surface area (increased by 72.7 times) after compositing GO with FeO, which exposed more active sites. In return, the electron transfer process, the two-electron oxygen reduction reaction (ORR) and the degradation efficiency were promoted in the cooperation of GO and FeO. Moreover, the incorporated TA would form a TA-Fe(III) complex to promote the reduction reaction from Fe to Fe, which strengthened the self-circulation of Fe and Fe and indirectly enhanced the conversion of HO to ROS to decompose PNP into smaller organic fragments or mineralize into CO, HO, NO or NO, etc. Obviously, the incorporation of TA provided a promising strategy to improve the electro-Fenton efficiency and realize the efficient removal of PNP in wastewater.
为了克服芬顿工艺中铁和铁之间氧化还原转化的缓慢动力学，我们建立了一种基于 GO-FeO 阴极和单宁酸（TA）的新型电芬顿系统，用于有效降解对硝基苯酚（PNP）。在最佳降解参数下（包括初始 PNP 浓度为 20mg/L、pH=5、电流密度为 30mA/cm 和 PNP:TA=1:2 的进料比），TA 增强的 GO-FeO 电芬顿系统对 PNP 的去除率超过 90.1%±0.2%，COD 去除率为 69.5%±0.84%，且具有良好的可重复使用性（经过 5 次循环后，去除率约为 80%）。所提出的 TA 增强的 GO-FeO 电芬顿系统的优异降解性能部分归因于优化的形态（FeO 的粒径减小到数十纳米，孔径减小约 80%，孔体积增加 24.3 倍）和更大的比表面积（增加了 72.7 倍），这是由于 GO 与 FeO 复合后暴露了更多的活性位点。反过来，GO 和 FeO 的协同作用促进了电子传递过程、两电子氧还原反应（ORR）和降解效率。此外，加入的 TA 会形成 TA-Fe(III) 配合物，促进从 Fe 到 Fe 的还原反应，从而增强 Fe 和 Fe 的自循环，并间接增强 HO 向 ROS 的转化，以将 PNP 分解成更小的有机片段或矿化为 CO、HO、NO 或 NO 等。显然，TA 的加入提供了一种提高电芬顿效率和实现废水中 PNP 有效去除的有前途的策略。
Zotero 插件