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Photocatalytic Degradation of Rhodamine B via Fe-g-C 3 N 4 Activated Sulfate Radical-Based Advanced Oxidation Processes and the Synergistic Mechanism
Abstract
Fe-doped g-C 3 N 4 has been proven to have the potential of visible light photocatalysis, but its catalytic activity of peroxymonosulfate
(PMS) is neglected. Herein, the complex advanced oxidation processes of Fe-g-C 3 N 4 mediated PMS and visible
light photocatalysis was developed, named as Vis/Fe-g-C 3 N 4 /PMS system, whose eff ects and synergistic mechanism for
decomposing Rhodamine B (RhB) was evaluated. The coupling of sulfate radicals and photocatalysis for RhB degradation
showed that the synergistic effi ciency ( η Syn ) and factor ( S c ) were 20.1% and 4.82, respectively, with a degradation effi ciency
of 99.8%. Iron species dispersed on g-C 3 N 4 provided active sites for PMS activation to generate sulfate radicals, simultaneously
reduced the forbidden band, and separated the photo-generated charges of g-C 3 N 4 . h + , SO 4
· ‾ and 1 O 2 were the main
active species, and the increase of 1 O 2 was the cause of the synergistic eff ect. The possible degradation path of RhB by this
coupling system was proposed. Our fi ndings prove that Vis/Fe-g-C 3 N 4 /PMS system has a great potential to decompose dye
wastewater, and also to be an environmental remediation perspective.
