Photocatalytic hydrogen evolution and Rifampicinum destruction over carbon-modified TiO2

Autor: Nataliya D. Shcherban, G. V. Korzhak, T. Khalyavka, V. V. Permyakov, S. V. Camyshan, O. Y. Khyzhun, S. N. Scherbakov, M. V. Shapovalova
Rok vydání: 2021
Předmět:
Zdroj: Research on Chemical Intermediates. 48:13-28
ISSN: 1568-5675
0922-6168
DOI: 10.1007/s11164-021-04609-1
Popis: Carbon-modified TiO2 using a sol–gel method (TiO2/CSG) and mechanochemical treatment (TiO2/CMC) was obtained. X-ray powder diffraction (XRD), scanning electron microscopy with an integrated system for electron microprobe analysis (SEM, EDX), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface area analysis, X-ray photoelectron spectroscopy (XPS), Infrared (IR) and Ultraviolet–visible (UV–Vis) spectroscopy were applied for the powders characterization. The presence of a hysteresis loop in the nitrogen ad(de)sorption isotherms for the synthesized samples proved their mesoporous structure. XRD analysis revealed the anatase and rutile phase in TiO2SG with a size of 10 and 7 nm, respectively, and only anatase phase (15–16 nm) for all TiO2/CSG samples modified by a sol–gel method was observed. Carbon additives to TiO2 did not lead to significant shifts in the peaks of bond energies of Ti 2p, O 1s and C 1s levels. The powders TiO2/CSG had additional bands in IR-spectra which are characteristic bonds of carbon with oxygen unlike the TiO2/CMC samples. It was found that modification of titanium dioxide with carbon by a sol–gel method leads to the band gap narrowing. Photocatalytic activity of the synthesized samples was investigated in H2 photoproduction and Rifampicinum (RF) photodestruction. The TiO2/CSG samples showed higher photocatalytic activity in both reactions compared to TiO2/CMC. The correlation between the RF photocatalytic degradation degree and RF adsorption was demonstrated. The reusability of the powders in RF photodegradation was checked.
Databáze: OpenAIRE
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