Advanced nanocomposite Bi2WO6@graphene oxide special material: Optical properties and photocatalytic activity for degradation of phenol red
DOI:
https://doi.org/10.54939/1859-1043.j.mst.IMBE.2025.102-107Keywords:
Bi2WO6@x%GO; Nanocomposite; Optical; Photocatalytic; Phenol red.Abstract
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.
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