期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 331, 期 1-2, 页码 58-63出版社
ELSEVIER
DOI: 10.1016/j.molcata.2010.07.014
关键词
Sol-gel method; Ultrasound; Microwave; Nanomaterials; Titania; Pyridine herbicides destruction; Water purification
资金
- University of Cordoba
- European Community
- Consejeria de Educacion y Ciencia of the Junta de Andalucia
- Spanish Ministerio de Educacion y Ciencia
The effect of aging the gel under ultrasonic (us) and microwave (mw) irradiation on the characteristics of the synthesized solids was studied. Sonication ensured the obtention of pure anatase nanoparticles in high crystalline state and generally led to obtain a high surface area and more active photocatalyst. Catalysts were characterized by a wide range of physical techniques (ICP-MS, N-2 isotherms, XRD, UV-vis and TEM). The total degradation of 3-chloropyridine was studied under titania-based photocatalysts, this degradation followed a zero-order kinetics respect to 3-chloropyridine. In our conditions, 100 ppm of 3-chloropyridine was degraded completely within ca. 8 h of UV-radiation (365 nm wavelength) on bare-titania systems. Some reactions intermediates were identified by SPME-GC-MS and a plausible mineralization route was suggested implying two parallel routes with hydroxylation and ring opening prior to or after the release of chloride ions. The modification of titania surface with metals (Fe, Pt, Pd) was detrimental for photocatalysis. (C) 2010 Elsevier B.V. All rights reserved.
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