Iron-containing graphene oxide modified graphite felt electrode and preparation method and application thereof

Abstract

The invention relates to the technical field of electrode preparation, in particular to an iron-containing graphene oxide modified graphite felt electrode and a preparation method and application thereof. The preparation method of the iron-containing graphene oxide modified graphite felt electrode comprises the following steps: (1) immersing a graphite felt into concentrated nitric acid, and heating to obtain a modified graphite felt; (2) dissolving Fe (NO3) 3.9 H2O, FeSO4. 7H2O and a pore forming agent in the graphene oxide solution to obtain a growth solution; and (3) placing the modified graphite felt in a growth solution, and carrying out heating treatment to obtain the iron-containing graphene oxide modified graphite felt electrode. The graphite felt which is high in mechanical strength, low in price and easy to obtain is adopted as the carrier, the electrode is modified through the one-step hydrothermal method, the problems that Fe is corroded and leached into a solution, and the electrode performance is poor are solved, the reaction time is effectively shortened, the TOC and TN removal efficiency is improved, and the electrode preparation cost and the process operation cost are reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of electrode preparation, in particular to a graphite felt electrode modified with iron-containing graphene oxide, a preparation method and application thereof. Background technique [0002] Electro-Fenton technology can catalyze dissolved oxygen in water at the cathode and generate H in situ through two-electron reduction 2 o 2 , and then decomposed to generate hydroxyl radicals for the degradation of pollutants. This method does not require additional oxidants, does not produce toxic by-products, and is simple to operate, so it has excellent application prospects. The heterogeneous electro-Fenton technology is an environmentally friendly, mild and efficient electro-Fenton technology, which is used to degrade organic pollutants. Meanwhile, heterogeneous electro-Fenton can activate H in situ 2 o 2 Generate hydroxyl radicals, avoiding Fe 2+ release and dependence on pH. [0003] Active cathode material...

AI Technical Summary

Problems solved by technology

And during use, due to the lack of catalytic sites (often only focus on H 2 o 2 production), Fe(II) cannot be electrocatalytically reduced at the cathode in time, so that the two-electron oxygen reduction (ORR) performance and the acquisition of Fe(II) cannot be considered simultaneously

[0004] Chinese patent CN110862128A discloses a method for preparing an iron disulfide composite graphite felt electrode. This invention can well overcome the problems of narrow pH range of the traditional Fenton reaction, large amount of iron and hydrogen peroxide, and non-renewable problems, but the metal is directly exposed The surface of graphite felt is easily corroded and peeled off, leading to electrode deactivation and subsequent separation problems

Chinese patent CN109244402A discloses a graphene-coated ferric oxide composite electrode material and a preparation method thereof, which proves the protective effect of graphene materials on transition metal materials, and the preparation process is also simpler than Chinese patent CN110862128A, but the method The material is a composite powder material, which is actually an active material on the surface of the electrode and cannot directly use the powder as an electrode, and the contact area of ​​the granular ferric oxide is much smaller than the layered double hydroxide of the flake Fe used in the present invention. matter (Fe II Fe III -LDH), its stability after anchoring is difficult to guarantee

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