Direct coating of V2O5/TiO2 nanoparticles onto glass beads by chemical vapor deposition

V2O5/TiO2 nanocomposite particles were synthesized and coated directly onto glass beads by chemical vapor deposition (CVD). Size-controlled, almost spherical, catalytic particles with agglomerated surface morphologies were synthesized by controlling the gas flow rate. The CVD-coated glass beads had a more uniform nanoparticle coating than those prepared using a dip-coating method. The photocatalytic activities of the coated beads toward the degradation of aqueous methylene blue were tested and the best activity was exerted by the beads coated at a vanadium precursor gas flow rate of 1.0 L/min. The structures of the coated beads were examined by scanning electron microscopy, the Brunauer, Emmett and Teller surface area, X-ray diffraction and X-ray photoelectron spectroscopy. The CVD process was found to be a suitable method for the single-step preparation of nanocomposite coatings on glass bead supports.

Graphical abstractV2O5–TiO2 nanoparticles were synthesized from two precursors and coated directly onto glass beads by CVD. The CVD-coated beads were deposited more evenly and were prepared more quickly and the catalytic activity was higher than that of the dip-coated bead. The highest catalytic activity was observed on the glass beads coated at a 1.0 L/min flow of vanadia precursor gas.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► V2O5-TiO2 was coated onto glass bead by CVD process with T-junction apparatus. ► CVD process was suitable for the one-step synthesis of nanocomposite coatings. ► Particle size increased gradually as vanadium precursor flow rate increased.