Carbon quantum dots modified Bi 2 WO 6 nanoflowers for enhancing photocatalytic activity: an experimental and DFT study

Carbon quantum dots (CQDs) decorated Bi 2 WO6 nanocomposites were successfully synthesised by a facile hydrothermal method. The prepared samples were characterised by the XRD, FESEM, TEM, XPS, UV–vis DRS, photocurrent and photoluminescence (PL) techniques. The DRS, photocurrent, PL spectra measurements reveal that the introduction of CQDs could broaden the absorption edge and accelerate the separation and transportation efficiency of carriers. Moreover, a reasonable charge transfer approach was given out based on the calculated work function and the differential charge difference. The CQDs/Bi 2 WO 6 ‐2 sample provides the optimal activity for photodegradation of CIP under simulated sunlight irradiation. It is hopeful that this work not only gives a reference for the design of CQDs/Bi 2 WO 6 composites, but also provides some mechanistic insights into enhanced photoactivity.