Crystallinity and thickness modulation of polymeric carbon nitride by dual-functional lithium ions for boosting photocatalytic H2O2 production

The production of H(2)O(2 )through photocatalysis is a green and economical alternative to conventional methods. Here, we prepared poly (heptazine imide) (PHI) phase polymeric carbon nitrides (Li-PCN) by facile lithium ions -assistant post-condensation method. Lithium ions not only can optimize condensation process, but also exfoliate and tailor PCN, resulting in higher crystallinity, excellent photo-absorption range, which enhance surface adsorption of dioxygen, and increase the number of electron transfers in the reaction. Based on the above ad-vantages, the Li-PCN exhibits excellent photocatalytic H2O2 (2680 mu mol g -1h- 1) production activity under visible light, which was about 35.7 times higher than that of PCN. Besides, we have increased the concentration of H(2)O(2 )through changing reaction solution to a final content of 4.8613 mM. Furtherly, the homemade H(2)O(2 )production was used to degrade methyl orange pollution by Fenton reaction. This work provides a new synthetic route to PHI and highlights the function of lithium ions, which can promote the development of more efficient photo -catalysts for H(2)O(2 )production.