Perfluoroalkyl-modified covalent organic frameworks for continuous photocatalytic hydrogen peroxide synthesis and extraction in a biphasic fluid system.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39271689.
- Also identified by DOI 10.1038/s41467-024-52405-3 and PMC identifier 11399338.
- Licence recorded as CC BY-NC-ND.
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Abstract
H<sub>2</sub>O<sub>2</sub> photosynthesis represents an appealing approach for sustainable and decentralized H<sub>2</sub>O<sub>2</sub> production. Unfortunately, current reactions are mostly carried out in laboratory-scale single-phase batch reactors, which have a limited H<sub>2</sub>O<sub>2</sub> production rate (<100 μmol h<sup>-1</sup>) and cannot operate in an uninterrupted manner. Herein, we propose continuous H<sub>2</sub>O<sub>2</sub> photosynthesis and extraction in a biphasic fluid system. A superhydrophobic covalent organic framework photocatalyst with perfluoroalkyl functionalization is rationally designed and prepared via the Schiff-base reaction. When applied in a home-built biphasic fluid photo-reactor, the superhydrophobicity of our photocatalyst allows its selective dispersion in the oil phase, while formed H<sub>2</sub>O<sub>2</sub> is spontaneously extracted to the water phase. Through optimizing reaction parameters, we achieve continuous H<sub>2</sub>O<sub>2</sub> photosynthesis and extraction with an unprecedented production rate of up to 968 μmol h<sup>-1</sup> and tunable H<sub>2</sub>O<sub>2</sub> concentrations from 2.2 to 38.1 mM. As-obtained H<sub>2</sub>O<sub>2</sub> solution could satisfactorily meet the general demands of household disinfection and wastewater treatments.