首页|Catechol-Formaldehyde Resin Coated CdS Core-Shell Composite as Robust Photocatalyst for Long-Term Sustainable Artificial Photosynthesis of H2O2
Catechol-Formaldehyde Resin Coated CdS Core-Shell Composite as Robust Photocatalyst for Long-Term Sustainable Artificial Photosynthesis of H2O2
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Catechol-formaldehyde resin(CFR)is very attractive for H2O2 production via the catalytic process.However,the H2O2 formation is ac-companied by the oxidation of catechol groups to o-benzoquinone groups on CFR,which will cause irreversible damage to CFR and greatly limit its long-term stable catalytic activity.Herein,CdS/CFR composite photocatalyst with a core-shell structure was synthe-sized by hydrothermal method.The photogenerated electrons of CdS are used as a powerful driving force for the reversible redox conversion between catechol groups and o-benzoquinone groups on the CFR,which not only achieves the long-term stability of CFR-catalyzed production of H2O2,but also promotes the separation efficiency of photogenerated e-and h+in CdS,greatly inhibiting their recombination,so as to maintain CdS stability.The H2O2 yield of CdS/CFR can accumulate to 1.65 mmol·L-1 under visible light for 6 h without sacrificial agent,which is about 3.1 and 2 times that of CdS and CFR,respectively,and CdS/CFR can persist for 10 cycles of photocatalysis(60 h).CdS/CFR also improves the yield of photocatalytic H2O2 by increasing the selectivity of H2O2 and inhibiting its decomposition.This work offers a novel tactic for expanding the application of CFR in photocatalytic generation of H2O2.
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