info:eu-repo/semantics/article
Photocatalytic reduction of Cr(VI) in a fully illuminated fluidized bed reactor
Fecha
2011-08Registro en:
Pozzo, Roberto Luis; Conte, Leandro Oscar; Giombi, Jose Luis; Baltanas, Miguel Angel; Photocatalytic reduction of Cr(VI) in a fully illuminated fluidized bed reactor; Iwa Publishing; Water Science And Technology; 64; 12; 8-2011; 2370-2375
0273-1223
Autor
Pozzo, Roberto Luis
Conte, Leandro Oscar
Giombi, Jose Luis
Baltanas, Miguel Angel
Resumen
The potential of a fluidized bed reactor for the UV-A photocatalytic reduction of Cr(VI), a priority water pollutant, by utilizing a TiO2/quartz sand composite, was explored. The effects of oxalic acid (OA) as a sacrificial agent in the heterogeneous system was also investigated and compared with the homogeneous photoreduction by the same dicarboxylic acid under both, oxygenated or anoxic conditions of the reacting media. The performance of the "preconditioned" photocatalyst, either by pretreating it with the OA solution (at dark or under UV-A illumination) or by letting the catalyst to stand wet with the OA solution, during designated time intervals (one to five weeks) prior to its reuse, was assessed. Then, up to 95% reduction of Cr(VI) to Cr(III) was achieved in less than 100 minutes.