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g-C3N4-triggered super synergy between photocatalysis and ozonation attributed to promoted •OH generation
Release time:2021-10-22    Views:54

Abstract

We coupled g-C3N4 or chlorine modified g-C3N4 (Cl/g-C3N4photocatalysis with ozonation for mineralization of oxalic acid (OA) under visible light. g-C3N4 and Cl/g-C3N4 could trigger a super synergy between photocatalysis and ozonation, with a coupling coefficient at 17.8 and 9.9, respectively. The great gap of redox potential between the conduction band of g-C3N4 and ozone greatly benefitted electrons captured by ozone molecules, and thus promoted charge separation and ozone self-decomposition into a growing number of hydroxyl radicals in a photocatalytic ozonation process. Besides, the influence of chlorine modification on g-C3N4 to photocatalysis and photocatalytic ozonation was also clearly stated.


Experimental

Photocatalytic ozonation process

    The photocatalytic ozonation was carried out at 25℃ under visible light (420-800nm) in a 450ml cylindrical borosilicate glass plate at the bottom.containing 300ml solution with 1 mmol(mm) of OA and 1 g/L of catalyst. The solution was irradiated under a 300W Xenon lamp(CEL-NP2000, Beijing China Education Aulight Co., Ltd), with a radiant flux of about 380mW/cm²  on the surface.

  

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