Sustainable hydrogen peroxide production based on dopamine through Janus-like mechanism transition from chemical to photocatalytic reactions

Embedding Carbon Quantum Dots into Crystalline Polyimide Covalent Organic Frameworks to Enhance Water Oxidation for Achieving Dual-Channel Photocatalytic H2O2 Generation in a Wide pH Range

“…4−6 Normally, photocatalytic H 2 O 2 synthesis over semiconductor can be achieved by two-electron oxygen reduction and two-electron water oxidation under light radiation. 7,8 Beyond all questions, the semiconductor photocatalyst plays an important role in the synthesis of H 2 O 2 . 9 Covalent organic frameworks (COFs), an advanced class of crystalline porous organic materials, are constructed from covalently linked organic molecules.…”

“…At present, H 2 O 2 can be produced by traditional anthraquinone and electrochemical methods, but these methods generally have some defects, such as explosion risk, toxic byproducts, and high energy consumption. , Therefore, it has become very necessary to develop the novel manufacturing technology of H 2 O 2 . Owing to the characteristics of low energy cost, high efficiency, and easy operation, the photocatalytic technique shows excellent application prospects in the synthesis of H 2 O 2 . − Normally, photocatalytic H 2 O 2 synthesis over semiconductor can be achieved by two-electron oxygen reduction and two-electron water oxidation under light radiation. , Beyond all questions, the semiconductor photocatalyst plays an important role in the synthesis of H 2 O 2 …”

Sustainable photocatalytic synthesis of hydrogen peroxide from catechol-formaldehyde resin microspheres modulated by nitrogen-doped carbon dots

“…This further confirmed the above fact that CFR-140 was chemically catalyzed to produce H 2 O 2 , and it is already known that light and ethanol can inhibit the chemical catalytic H 2 O 2 formation process by CFR-140. 39 The formation of H 2 O 2 in the system depended on the oxidation of catechol groups in CFR-140 by oxygen molecules in the solution. Both acidic and alkaline environments damaged the catechol groups to the point that H 2 O 2 production was significantly reduced (Fig.…”

“…5d). It is believed that the catechol groups themselves in CFR-140 were oxidized to quinone by O 2 in solution to produce H 2 O 2 , 30,39 and this process could not be recovered, resulting in its inability to maintain consistent catalytic activity for a long time.…”

“…In 2022, Kim's team used catechol groups in dopamine as the active sites of O 2 , and the catechol structure-containing amino groups in dopamine generated H 2 O 2 through autooxidation chemistry in the absence of light. 39 While polydopamine (PDA) formed in an alkaline environment has semiconductor properties and can photocatalyze the generation of H 2 O 2 ; compared with PDA, catechol is more suitable for industrial production because of its low cost, simple preparation method, and wide application. Catechol-formaldehyde resin (CFR) has a dihydroxyl group and a strong chelating effect on metal ions.…”