Journal
CHEMICAL ENGINEERING JOURNAL
Volume 420, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129705
Keywords
Fe3O4/BiOBr/CQDs; Photocatalyst; Carbamazepine; Photoinduction; Charge transfer
Categories
Funding
- National Natural Science Foundation of China [42077330]
- National Key R&D Program of China [2018YFC1903700]
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A green and efficient photocatalyst Fe3O4/BiOBr/CQDs was successfully fabricated via photoinduced method for the removal of emerging pollutants, especially CBZ. The enhanced visible light absorption and photogenerated charge transfer efficiency, along with the Z-scheme structure constructed by biomass CQDs, contributes to the high photocatalytic activity of the Fe3O4/BiOBr/CQDs catalyst. This research provides a promising potential for the future application of Fe3O4/BiOBr/CQDs in water pollutant treatment.
Seeking green, highly efficient and recyclable photocatalysts for emerging pollutants removal is urgent and desirable in water treatment area. In this work, novel and environmental-friendly photocatalyst Fe3O4/BiOBr/CQDs decorated by corncob biomass carbon quantum dots (CQDs) was fabricated successfully via photoinduced method for the first time. More CQDs as electrons reservoir were deposited on the (1 1 0) facet of BiOBr by photoinduced strategy compared to common hydrolysis method through morphology observation. Besides, enhanced visible light absorption and photogenerated charge transfer efficiency make Fe3O4/BiOBr/CQDs perform best photocatalytic activity towards carbamazepine (CBZ, 10 mg/L) removal, where 99.52% CBZ could be eliminated within 120 min light irradiation. Moreover, center dot O-2(-), h(+) and .OH dominated the photodegradation process and three detailed degradation pathways depicted the transformation behavior of CBZ, which were mainly attributed to Z-scheme structure construction caused by electronic bridging and up-conversion photoluminescence of biomass CQDs. A series of photoelectrochemical tests verified the existence of CQDs and Fe3O4 solved the high charge recombination rate and low electron utilization problems of BiOBr indeed. Combined with the rational utilization of corncob waste biomass, this research indicates green photocatalyst Fe3O4/BiOBr/CQDs synthesized by photoinduced method will have wide potential in water pollutant treatment in the future.
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