Recent progress in electrocatalytic selectivity in heterogeneous electro-Fenton processes

Abstract

Heterogeneous electro-Fenton has attracted tremendous interest as a promising advanced oxidation process to treat refractory organic contaminants, but the practical application is still limited by a narrow pH response range,...

Recyclable Binder-free 3D LaFeO3@TiO2-NTs Heterostructure Catalysts for the Enhanced Degradation of Tetracycline via In Situ Produced H2O2

“…The pH values of the solution increase differently with an extended reaction duration, which can be ascribed to the consumption of H + . When the initial pH is ≥3.0, the pH of the solution tends to be neutral after 60 min, which is infaust for the EF reaction . When the initial pH is 1.0, the test solution maintains the acidic environment required for the Fenton reaction well during the EF process, resulting in the rapid degradation of TC.…”

“…The distinct advantage of EF lies in its capacity to in situ generate H 2 O 2 , mitigating the need for dosing procedures and reducing potential risks. The EF process entails two essential reactions: in situ H 2 O 2 production and Fenton reaction, governed by the following equations , O 2 + 2 H + + 2 e − → H 2 O 2 normalF e 2 + + H 2 O 2 → F e 3 + + O H − + normalO normalH • …”

Heterogeneous electro-Fenton removal of polyacrylamide in aqueous solution over CoFe2O4 catalyst

“…According to the properties of the catalyst, the EF process can be divided into homogeneous and heterogeneous processes (Soliu et al 2018;Zou et al 2022;Song et al 2023). In traditional homogeneous EF, the catalyst is an external iron source or anode dissolves, and eventually exists in the solution in the form of ions, which makes it difficult to separate and recycle the catalyst, and a large amount of iron sludge is generated when the pH of the effluent is adjusted, increasing the operating cost (Liu et al 2023). In addition, the problems of low H 2 O 2 generation rate, narrow pH adaptation range (2-4), long reaction time and low current utilization efficiency should not be ignored (Wang et al 2022;Zhang et al 2022).…”