Magnetically Separable Fe3O4/SiO2/TiO2 Photocatalyst Composites Prepared through Hetero Agglomeration for the Photocatalytic Degradation of Paraquat

Authors

Jarnuzi Gunlazuardi, Department of Chemistry, Faculty of Mathematics and Science, University of Indonesia, Depok 16424, IndonesiaFollow
Adel Fisli, Center for Technology of Nuclear Industry Materials, National Nuclear Energy Agency, Kawasan Puspiptek, Serpong 15314, Indonesia
Ridwan Ridwan, Center for Technology of Nuclear Industry Materials, National Nuclear Energy Agency, Kawasan Puspiptek, Serpong 15314, Indonesia
Yuni Krisyuningsih Krisnandi, Department of Chemistry, Faculty of Mathematics and Science, University of Indonesia, Depok 16424, Indonesia
Didier Robert, Institut de Chimie et des Procédés pour l’Energie, l’Environnement et la Santé, (UMR CNRS 7515), Université de Strasbourg, 25 rue Becquerel 67087 Strasbourg Cedex, France

Abstract

A photocatalyst supported on magnetic material allows the simple technique by using an external magnetic material to separate photocatalyst from the treated water. Thus, it is a magnetically separable nanoparticles photocatalyst (MSNP). The use of superparamagnetic nanoparticles that do not pose spontaneous magnetic moment thus could be dispersed in water and can be recollected easily by an external magnetic bar. We prepare Fe₃O₄/SiO₂/TiO₂ composite by hetero agglomeration of Fe₃O₄/SiO₂ and TiO₂ at a pH range of 3 to 6.2 in an aqueous slurry_.The Fe₃O₄/SiO₂ was prepared via co-precipitation of iron (II) and iron (III) ionic solution containing ammonium hydroxide and sodium silicate. The prepared composites were characterized by XRD, TEM, FTIR, and VSM, while the photocatalytic activities were tested toward paraquat in water. Based on zeta potential values, the Fe₃O₄/SiO₂and TiO₂ were being hetero agglomerated at pH 5 to obtain Fe₃O₄/SiO­₂/TiO₂ composite. The XRD characterization confirmed the presence of anatase, rutile, and magnetite crystal phases. TEM images showed that the Fe₃O₄ was covered by SiO₂ and randomly attached to TiO₂. The observed FTIR peak at 940-960 cm^-1 attributed to -Si-O-Ti- bonding mode, ensuring photocatalyst (TiO₂) adherence to the Fe₃O₄/SiO₂ cluster. The prepared Fe₃O₄/SiO₂/TiO₂ composite showed good photocatalytic activity for the paraquat removal and showed a good magnetic property (VSM measurement)

Recommended Citation

Gunlazuardi, Jarnuzi; Fisli, Adel; Ridwan, Ridwan; Krisnandi, Yuni Krisyuningsih; and Robert, Didier (2021) "Magnetically Separable Fe3O4/SiO2/TiO2 Photocatalyst Composites Prepared through Hetero Agglomeration for the Photocatalytic Degradation of Paraquat," Makara Journal of Science: Vol. 25: Iss. 4, Article 6.
DOI: 10.7454/mss.v25i4.1277
Available at: https://scholarhub.ui.ac.id/science/vol25/iss4/6