Mineralization of norfloxacin in a CoFe–LDH/CF cathode-based heterogeneous electro-fenton system: Preparation parameter optimization of the cathode and conversion mechanisms of H2O2 to ·OH

Titanium Carbide Composite Hollow Cobalt Sulfide Heterojunction with Function of Promoting Electron Migration for Efficiency Photo-Assisted Electro-Fenton Cathode

“…In addition, O 2 is rapidly converted to produce H 2 O 2 on the CoS 2 /CoS/Ti 3 C 2 surface as Equations ( 5) and ( 6). The generated H 2 O 2 is then activated on the surface of CoS 2 /CoS/Ti 3 C 2 and participated in the activated process to generate •OH as the Equation (10). Due to the synergistic effect of S 2− and Co, Co(II) can be regenerated on the surface of the cathode (Equation ( 11)) [18,19].…”

“…Iron-based catalysis, including FeS, FeS 2 , etc., have been proven to have EF properties for activating H 2 O 2 , however, the tepid H 2 O 2 yield greatly hinder the efficacy of EF technology [6]. One of the common solutions is combination metal-based materials with carbonaceous carriers because of that the oxyfunctional groups and defect sites of the carbon materials provide sufficient approach for the 2e − ORR [7][8][9][10]. However, the large overpotential and long-term operation of the metal-carbon carrier cathode may cause the metal particles to fall off and carbonaceous carrier poisoning.…”

The Piezo–Fenton synergistic effect of ferroelectric single-crystal BaTiO3 nanoparticles for high-efficiency catalytic pollutant degradation in aqueous solution

“…35 Subsequently, H 2 O 2 is facilely turned to more ·OH by the Fenton-reaction on basis of eqn (6). 36 H 2 O 2 + Fe 2+ → ·OH + OH − + Fe 3+ …”

Research progress of carbon-based materials for electro-Fenton degradation of pollutants

“…Han 等 [65] 制备了富含醌基的碳材料， 发现其具有很高 的双电子 ORR 选择性和活性，H2O2 产率高达 97.8% (0.75 V vs. RHE)。 图 6 不同碳纳米管和炭黑比例石墨毡电生 H2O2 的产率及能耗： 电流密度 mA•cm -2 ， Na2SO4 浓度 0.05 mol•L -1 ，pH 7 [55] Figure 6 Dependence of CNT to CB ratio on the production of H2O2: Current density = 20 mA•cm −2 , Concentration of Na2SO4 = 0.05 mol•L -1 and pH = [55] . [66][67][68][69] 。此外，非均相电芬顿反应还可以解决铁泥的生 成和电解液 pH 有效范围窄的问题 [70,71] 。催化剂物理 化学性质的改进，如减小孔径和增加比表面积等，还 可通过纳米颗粒负载实现。其中，负载磁性纳米颗粒 能够简化催化剂与反应介质的分离过程以便于重复 使用。因此，新兴纳米颗粒在碳基材料上的负载可以 促进非均相催化剂在电芬顿体系中的应用 [72] 。 金属氧化物与碳材料表面的 C 会发生一系列氧 化还原反应，从而产生丰富的氧空位和碳缺陷。Lian 等 [73] Figure 7 Mechanism of synergetic enhancement of heterogeneous electro-Fenton [75] . 由于负载在碳基材料上的含铁颗粒通常表现出 一般的非均相电芬顿活性和较差的稳定性， 同时还具 有较差的耐酸腐蚀性和载体粘合性。近年来，单原子 催化剂(SACs)由于金属原子的最大原子利用率而 备受关注， 它继承了均相催化剂和非均相催化剂的优 点 [77] 。 如 基 于 单 原 子 Co [78] 、 Mo [79] 或 Fe [80,81] 的 [82] [33] ；(c)不同 pH 条件下环 丙沙星降解效果 [92] Figure 8 Degradation of pollutants using carbonaceous materials as the cathode of EF: (a) Removal TOC of metalaxyl with different cathodes [86] ; (b) Effect of applied potentials on the removal of diuron [33] ; (c) Effect of solution pH on the removal of ciprofloxacin [92] .…”