Metal-free diatomaceous carbon-based catalyst for ultrafast and anti-interference Fenton-like oxidation

Herein,a diatomite biomorphic Si-O doped carbon-based catalyst （DB-SiOC） was prepared using natura mineral diatomite as the silicon source and porous template.The results showed that the metal-free DB SiOC catalyst exhibited ultrafast oxidation towards chlorophenol （CP） via peroxymonosulfate （PMS） activa tion,which was almost one order of magnitudes than most of carbon-based catalysts.The DB-SiOC/PMS system also showed the high ability to resist the interference of environmental matrix.The radicals (·OH and SO4·–) exhibited a very small contribution to the CP oxidation while the electron transfer processe（ETP） played the major role in the DB-SiOC/PMS system.The electron shuttles from the electron-donating CP molecules to the adjacent DB-SiOC/PMS*could be efficiently triggered via Si-O bonds as bridges,mak ing it possible for ultrafast oxidation of CP.In addition,the hollow-disc shaped DB-Si OC provided the biomorphic DE structures with abundant pores for enriching the PMS and pollutants,thus further ac celerating the oxidation reaction.This work provided a new routine for the fabrication of Si-O doped carbon-based catalysts with excellent Fenton-like catalytic activity,which would greatly promote thei application prospects in Fenton-like systems.