Constructing a novel I-BiOBr/CQD composite for near-infrared–driven photocatalysis

Abstract In this study, a novel composite of Iodine-doped bismuth oxybromide (I-BiOBr)/carbon quantum dots was synthesized using a simple chemical precipitation method at ambient temperature. The bandgap energy of bismuth oxybromide (BiOBr) can be reduced from 2.78 to 2.28 eV by introducing I-ions, aligning it with the upconverted emission spectrum of carbon quantum dots. Consequently, the photodegradation efficiency of I-BiOBr/carbon quantum dots reached a 95% degradation rate for methyl orange after 120 min of visible light irradiation, which is 4.2 times than that of BiOBr.