Fabrication and photoactivity of ionic liquid-TiO2 structures for efficient visible-light-induced photocatalytic decomposition of organic pollutants in aqueous phase.
作者： Anna Gołąbiewska , Marta Paszkiewicz-Gawron , Aleksandra Sadzińska , Wojciech Lisowski , Ewelina Grabowska
DOI: 10.3762/BJNANO.9.54
关键词:
摘要: To investigate the effect of ionic liquid (IL) chain length on surface properties and photoactivity TiO2, a series TiO2 microspheres have been synthesized via solvothermal method assisted by 1-methyl-3-octadecylimidazolium chloride ([ODMIM][Cl]) 1-methyl-3-tetradecylimidazolium ([TDMIM][Cl]). All as-prepared samples were characterized X-ray powder diffraction (XRD), photoelectron spectroscopy (XPS), diffuse reflectance (DRS), scanning transmission microscopy (STEM) Brunauer-Emmett-Teller (BET) area method, whereas photocatalytic activity was evaluated degradation phenol in aqueous solution under visible light irradiation (λ > 420 nm). The highest photoefficiency (four times higher than pristine TiO2) observed for sample obtained presence [TDMIM][Cl] IL to precursor molar ratio 1:3. It revealed that interactions between ions growing titanium dioxide spheres results red-shift absorption edge IL-TiO2 semiconductors. In this regard, direct increase comparison observed. active species trapping experiments indicated O2•- is main species, created at material visible-light illumination, responsible effective degradation.
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