Modification of TiO2 with graphene oxide and reduced graphene oxide; enhancing photocatalytic activity of TiO2 for removal of remazol Black B

摘要

Modified titanium dioxide (TiO2) nanoparticles with graphene oxide (GO) and reduced graphene oxide (rGO) were prepared using the chemisorption process. The characterization was carried out by IR, X-ray diffraction spectra, scanning electron microscopy, energy dispersive X-ray spectroscopy, and DRS techniques. The photocatalytic activity of GO/TiO2 and rGO/TiO2 nanocomposites was evaluated in photodegradation of Remazol Black B (RBB). The effects of various parameters, such as pH, adsorbent dosage, dye concentration, and contact time, were studied in a batch system. The results showed that GO/TiO2 and rGO/TiO2 nanocomposites can extend the absorption of light to the visible region and makes the photocatalysts active under visible-light irradiation. Photocatalytic activity clearly showed that the modification of TiO2 nanoparticles by GO and rGO enhanced the degradation of RBB from the aqueous solution (99.9% dye removal). Photodegradation processes fitted well with the pseudo-first-order kinetic model (R-2 0.99). POLYM. COMPOS., 40:210-216, 2019. (c) 2017 Society of Plastics Engineers