4.7 Article

Photocatalysis of naphthalene by Fe3O4/Oxone/UV: Simultaneous radical and non-radical pathways

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ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.105076

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Adsorption; Photocatalysis; Recyclable catalyst; Naphthalene; Advanced oxidation process

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  1. Hong Kong Polytechnic University [3-RAAE, 4-9A6X]

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Naphthalene degradation was successfully achieved using graphene/oxidized graphene/UV photocatalysis. The reaction is influenced by catalysis and adsorption mechanisms under acidic and alkaline conditions, with improved performance observed after reuse.
Naphthalene (Nap) degradation by photocatalysis of Fe3O4/Oxone/UV was studied. The system eliminated Nap in 30 min and the kinetics is described by a novel mixed order model with adsorption and decay dominant rate constants, representing non-radical and radical pathways respectively. The reaction is dominated by catalysis in acidic pHs as Oxone anions are adsorbed onto the protonated Fe3O4 surface for activation; In alkaline solution, the adsorption of Nap to the deprotonated Fe3O4 surface is the main removal pathway. The catalyst was reused for 5 cycles and the performance was enhanced after reuse. XPS study confirmed that the surface Fe content of Fe3O4 remained stable after reusing due to the effective UV-assisted equivalent to Fe-II-equivalent to Fe-III catalytic cycle. An additional C-O bond on Fe3O4 surface was detected after reuse, which is proposed to be an OH bond on catalyst as an extra adsorption site and for radical generation.

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