Abstract

Eko Sri Kunarti, Roto Roto, Adya Rizky Pradipta and Iis Setyo Budi

DOI : http://dx.doi.org/10.13005/ojc/330439

Nanosized-photocatalysts with additional magnetic functionality have been studied extensively for many potential applications. Fe₃O₄/SiO₂/TiO₂core-shell nanoparticles have been evaluated as catalyst for photoreduction of aqueous solution of Ag(I) ions. The nanoparticles was prepared by coating Fe₃O₄ with SiO₂ and TiO₂consecutively through sol-gel process followed by microwave-assisted treatment. The prepared nanoparticles were confirmed by XRD and TEM. A photocatalytic reaction was carried out in a batch system with a UV-irradiation[A1]  wavelength of 340-390 nm. The effects of catalyst loading, irradiation time and solution pH were studied. The Ag(I) photoreduction progress was monitored by AAS. The obtained Fe₃O₄/SiO₂/TiO₂ core-shell nanoparticles can reduce 97% of Ag(I) in the solution whereas unmodified TiO₂ solids can only reduce 37% of the ion. The photocatalytic reaction could be best performed at pH 6, irradiation time of 2 h, and initial Ag(I) concentration of 25 mg[A2] /L. The prepared materials could be of interests in the treatment of waste containing toxic heavy metal ions.

Fe3O4/SiO2/TiO2; core-shell; nanoparticles; photocatalyst; silver(I)

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