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Abstract

A low-energy consumption electrocatalytic method for electrosynthesis of hydrogen peroxide coupled with oxidation upcycling of PET plastics is provided. The method includes ball-milling a waste polyethylene terephthalate (PET) plastic into powder, depolymerizing in alkali solution, and then using the transition metal catalyst and carbon-based material as anode and cathode in the circulating electrolytic cell, under the applied voltage, the cathode undergoes an oxygen reduction reaction to generate hydrogen peroxide, and the anode undergoes an oxidation reaction to upgrade ethylene glycol to formic acid. Products of terephthalic acid and potassium diformate are obtained by adjusting the pH and vacuum distillation of the anode electrolyte. The sodium perborate product or benzoyl peroxide product can be prepared in the cathode electrolyte. The process has significant energy saving effect, avoids the separation of thermodynamically unstable hydrogen peroxide, and simultaneously realizes the recycling of waste PET plastics and the green electrosynthesis of hydrogen peroxide.

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