Advanced nanocomposite Bi2WO6@graphene oxide special material: Optical properties and photocatalytic activity for degradation of phenol red

In this paper, the photofluorescence emission, energy reflection and diffusion properties, band gap energy, surface charge distribution and magnetic properties of Bi2WO6@(0-5)%GO nanoparticles have been further studied. The photoluminescence (PL) spectrum of Bi2WO6@(0-5)%GO nanoparticles has strong emission in the blue-red light region (450-713 nm), in which the peaks at 468 and 569 nm correspond to the energy shift in the oxygen vacancy state of Bi2WO6. The emission intensity of Bi2WO6@5%GO in the 435-525 nm region is lower than that of Bi2WO6, which reduces the recombination rate of electrons and holes in the Bi2WO6@5%GO hybrid nanocomposite. GO enhanced the energy absorption capacity of Bi2WO6@5%GO in the visible region, and the band gap of Bi2WO6@(0-5)%GO nanoparticles was in the range of 2.76 - 2.88 eV. Both GO and Bi2WO6@(0-5)%GO nanoparticles had negative surface charges ranging from -21.697 mV to -9.124 mV and had small magnetism. The chemical adsorption of phenol red (PR) on the surface of Bi2WO6@(0-5)%GO nanoparticles was from 22.25% to 31.96%, following the second-order adsorption kinetic model with a correlation coefficient R2 of about (0.971–0.992). In particular, Bi2WO6@(0-5)%GO nanoparticles had good photocatalytic activity, the photodegradation efficiency of PR reached 64.89% - 86.04% under visible light illumination in 210 min. The PR photolysis reaction followed the first-order reaction kinetic model, in which the Bi2WO6@5%GO nanocomposite exhibited high photocatalytic activity, with the photolysis reaction rate constant 1.83 times larger than that of the original nano Bi2WO6. Based on its outstanding properties, nanocomposite Bi2WO6@(0-5)%GO has potential applications in the treatment of color indicators/dyes in chemistry and food technology, in the textile industry and in the fields of semiconductor technology, electrical engineering, electronics, luminescence, automation and green chemistry.