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Date of Publication:2016-01-01

Journal:生态毒理学报

Issue:5

Page Number:49-56

ISSN No.:1673-5897

Abstract:Effects of humic acid (HA) on photochemical production of singlet oxygen (1O2) and hydroxyl radical (·OH) induced by four typical carbon nanomaterials were investigated by using electron paramagnetic resonance (EPR).Based on the density functional theory, the frontier orbital energies of four typical carbon nanomaterials were calculated, and their ability of 1O2 generation by energy transfer and ·OH production by electron transform were compared, respectively.Results showed that C60, single-walled carbon nanotubes (SWNT), multi-walled carbon nanotubes (MWNT) and graphene suspensions didn't induce the production of 1O2 and ·OH under UV irradiation.When HA was present, four typical carbon nanomaterials significantly enhanced 1O2 production.In addition, C60 and graphene in HA solutions also caused ·OH generation.The ability to produce 1O2 followed the order: SWNT > C60 > MWNT > graphene, and to produce ·OH followed the order: graphene > C60.The capacity of 1O2 production is attributed to the energy gap and particle aggregation degree of carbon nanomaterials, and the ability to induce ·OH mainly depended on the chemical hardness.In conclusion, our results indicated the synergistic photogeneration of 1O2 and ·OH by HA and carbon nanomaterials.

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