Photodegradation of phenol, 2-chlorophenol and o-cresol by iron oxide nanoparticles
Por:
Suárez-Parra R., Hernández-Pérez I., Montiel-Palacios E., Pérez-Orozco J.P., Sampieri A., Vázquez-Avella D., Jiménez-González A.E., Guardián-Tapia R.
Publicada:
1 ene 2011
Resumen:
Iron oxide nanoparticles were prepared by mixing either aged iron(II) or aged iron(III) hydrated chlorides with hydrogen peroxide at pH 4.2±0.1. Iron oxide nanoparticles were identified in the mixtures of iron(II/III) chlorides with hydrogen peroxide by transmission electron microscopy (TEM) analyses. TEM analyses showed irregular sizes and the formation of different phases of iron oxide (a-Fe2O3, ß-Fe2O3, ?-Fe2O3, e-Fe2O3...). The variety of iron(III) oxide phases was a consequence of interactions of hydrogen peroxide with different ferric oligomers and iron oxohydroxides formed during the aging of iron(II/III) chloride mixtures. In order to decompose phenol or 2-chlorophenol or o-cresol a photocatalytic reaction was carried out in a "reactor" with iron oxide nanoparticles, visible radiation and hydrogen peroxide. Each reaction was kept at room temperature and pH 3.8±0.1. The photocatalytic processes were analyzed through UV spectrophotometry, chemical oxygen demand (COD) and total organic carbon (TOC) measurements. Iron oxide nanoparticles, in the photodegradation of phenol, 2-chlorophenol and o-cresol, presented bifunctional catalytic properties, such as a semiconductor photocatalyst and probably as Lewis acid catalyst. © 2011 Bentham Science Publishers Ltd.
Filiaciones:
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Apartado Postal 34, Temixco, Morelos 62580, Mexico
Universidad Autónoma Metropolitana-A, Dpto. de Ciencias Básicas, Av. Sn. Pablo No. 180, México, D.F. 02200, Mexico
Instituto Tecnológico de Zacatepec, Departamento de Ingeniería Química y Bioquímica, Calzada Tecnológico No. 27, Col. Centro, Zacatepec, Morelos, CP 62780, Mexico
Benemérita Universidad Autónoma de Puebla, Facultad de Ingeniería Química, Av. San Claudio y 18 Sur, Puebla, Puebla 72592, Mexico
Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad s/n Col. Chamilpa, Cuernavaca, Morelos 62210, Mexico
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