Abstract
• Fe 3 O 4 /BiOBr/CQDs derived from corncob biomass was prepared by photoinduced method. • More CQDs decoration by photoinduced method rather than hydrolysis method was proved. • Better visible light absorption and charge transfer occurred with the help of CQDs. • Z-scheme structure construction facilitated carbamazepine degradation process. • Agricultural wastes full utilization was also achieved by using residual hydrochar. 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 Fe 3 O 4 /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 Fe 3 O 4 /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, ·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 Fe 3 O 4 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 Fe 3 O 4 /BiOBr/CQDs synthesized by photoinduced method will have wide potential in water pollutant treatment in the future.
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