Sol–gel and impregnated prepared silver TiO2 semiconductors as photocatalysts for the UV decomposition of 2,4-d: a comparative study of the preparation method

• Published in: Journal of sol-gel science and technology 2011-07, Vol.59 (1), p.57-62
• Main Authors: Rodríguez-González, V., Morán-Pineda, F. M., Del Angel, P., Vazquez-Cuchillo, O., Gómez, R.
• Format: Article
• Language: English
• Subjects: Anatase; Catalysis; Ceramics; Chemistry; Chemistry and Materials Science; Colloidal gels. Colloidal sols; Colloidal state and disperse state; Comparative studies; Composites; Contaminants; Dichlorophenoxyacetic acid; Exact sciences and technology; Gelation; General and physical chemistry; Glass; Herbicides; Inorganic Chemistry; Materials Science; Nanomaterials; Nanoparticles; Nanotechnology; Natural Materials; Optical and Electronic Materials; Original Paper; Oxidation; Photocatalysis; Photocatalysts; Photochemistry; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Semiconductors; Silver; Sol-gel processes; Specific surface; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titanium dioxide
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-011-2462-3

UV-photocatalytic oxidation of 2,4-dichlorophenoxyacetic acid (2,4- d ) was studied on Silver–TiO 2 semiconductors prepared by co-gelling silver acetylacetonate and titanium butoxide (TiO 2 –Ag) or by incipient impregnation with silver acetylacetonate (0.5 wt% Ag) of bare TiO 2 sol–gel and TiO 2 –P25 supports. The comparative study shows that only a slight modification on the specific surface area was obtained on the TiO 2 –Ag sample (60 m 2 /g) as compared to the TiO 2 sol–gel bare support (65 m 2 /g). XRD patterns of the samples show anatase as the crystalline phase present in the sol–gel TiO 2 preparations. By means of HRTEM and HAADF-STEM electron microscopy techniques, silver nanoparticles (