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Activity of Mixed Metal Oxide V-TiO2 Photocatalyst in Complex Matrix

Khon Khunn, Chan Oeurn Chey, Solida Long, Laingshun Huoy, Khley Cheng, Mamadou Traore, Andrei Kanaev

Abstract


The mixed vanadium-titanium oxoalkoxide (VTOA) nanoparticles with molar ratios V/(Ti+V) = 0, 0.01, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30 were synthesized by the sol-gel method. The nanoparticle sizes of different compositions were in the range between 2.2 and 3.6 nm as measured via dynamic light scattering (DLS) method. Thin films coated on glass beads and powders were prepared of VTOA nanoparticles and used after the heat treatment at 450 and 500C for 4 hours as photocatalyst to decompose representative pollutants methylene blue, paracetamol, and phenol in aqueous solutions under UV-light and natural sunlight. The highest activity under both UV-A and natural sun light illuminations showed photocatalysts with the composition V/(Ti+V) = 0.10. The effective activity of the photocatalysts by varying matrix, pH and number of cycles was investigated. The best performance showed nanopowder with 10 mol% V removing 95, 92, and 86% of MB pollutant from aqueous solutions. The results permit to conclude about photocatalyst stability in the pollutant
decomposition over a large range of pH values, which correspond to the natural waters conditions. Results also indicate a better durability of the V-TiO2 photocatalyst in the environmental process compared to pure TiO2 photocatalyst. The prepared material can be used to decompose pollutants in real matrix at the level of pond water under sunlight.


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