Abstract
Carbon dots (CDs) and Bi-riched bismuth oxyhalide have great potential in the field of photocatalysis. Here, a series of CDs/Bi4O5Br2 at different loading ratios were successfully synthesized by solvothermal method. Experiments of visible light degradation of ciprofloxacin (CIP) showed that 3 wt% CDs/Bi4O5Br2 had the highest activity (5.39 times that of Bi4O5Br2) and the degradation rate reached 98%. The samples were characterized by XRD, SEM, TEM, EDS, Mapping, UV–vis DRS, Raman, and PL spectra. The absorption edge of 3 wt% CDs/Bi4O5Br2 was red-shifted from 455 nm to 580 nm compared with Bi4O5Br2. The enhancement of photocatalytic activity was mainly due to the fact that the addition of CDs not only broadened the photo-response range, but reduced the recombination rate of photo-induced carriers with good electron transport interfaces formed.
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