Carbon aerogel for improving divalent Fe reducibility and hydrogen peroxide yield in electrode as well as preparation method and application thereof
A technology of carbon aerogel and hydrogen peroxide, which is applied in the field of water treatment, can solve the problems of low 2-electron selectivity of oxygen reduction, reduce the productivity of 2-electron oxygen reduction, wide pH range, etc., and achieve good electrocatalysis Activity, excellent mechanical strength and stability, uniform particle size effect
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[0038] Example 1
[0039] Aiming at the problems of unstable structure of heterogeneous E-Fenton system catalyst, low oxygen reduction 2 electron selectivity in the system, and low OH yield, an in-situ formed electrode is provided to improve the reducibility of divalent Fe and hydrogen peroxide in the electrode. Fe for production 3 O 4 / FeS x Preparation method of carbon aerogel cathode.
[0040] Fe in this example 3 O 4 / FeS x The specific preparation steps of carbon aerogel are as follows:
[0041] Mix resorcinol, formaldehyde, water and sodium carbonate with a molar ratio of 1:2:17.5:0.0008. After stirring evenly, add m Fe / m (Fe+C) =3% iron acetylacetonate and m S / m (S+C) =3% thiourea, mix evenly and pour it into a glass mold to seal; place the glass mold at 30°C for 24h, 50°C for 24h, and 90°C for 72h to form a metal wet gel by condensation polymerization, and wet the prepared The gel was immersed in acetone at room temperature for 72 hours, and the acetone was replaced eve...
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[0044] Example 2
[0045] Aiming at the problems of unstable structure of heterogeneous E-Fenton system catalyst, low oxygen reduction 2 electron selectivity in the system, and low OH yield, an in-situ formed electrode is provided to improve the reducibility of divalent Fe and hydrogen peroxide in the electrode. Fe for production 3 O 4 / FeS x The preparation method of the carbon aerogel cathode, the material improves the stability of the electrode and the 2-electron selectivity of oxygen reduction, enhances the generation ability of OH radicals, and can be used to achieve high-efficiency mineralization and degradation of DMP and 3-chlorophenol. Use high performance liquid chromatography (HPLC), total organic carbon analyzer (TOC) and other characterization techniques to show that Fe 3 O 4 / FeS x Carbon aerogel cathode has the ability to degrade DMP and 3-CP. Using advanced transmission electron microscopy, X-ray diffraction and other characterization techniques, it shows that Fe ...
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[0050] Example 3
[0051] The difference from Example 2 is that the carbon aerogel passes through CO before use 2 During activation, the temperature rises to 850°C at a rate of 5°C per minute.
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