Dyah Ayu Larasati, Deska Lismawenning Puspitarum, Nurul Imani Istiqomah, Zurnansyah, Larrisa Jestha Mahardhika, Nugraheni Puspita Rini, Daiki Oshima, Takeshi Kato, Juliasih Partini, Edi Suharyadi
Developing a sustainable and effective approach to separate photocatalytic nanoparticles from processed solutions is vital to support their reuse. Magnetic nanocomposites with superior catalytic efficiency and easy separability present a promising avenue for enhancing wastewater treatment processes. Here, we present the photocatalytic degradation of magnetically separable green synthesized cobalt ferrite/reduced graphene oxide (CoFe2O4/rGO) under ultra-violet irradiation. The CoFe2O4 nanoparticles were synthesized via a green approach using Moringa oleifera leaf extract as a reducing and capping agent, while rGO was prepared by reducing GO with Amaranthus viridis leaf extract. The crystallite size decreased with increasing rGO concentration. The morphological images illustrate that the particles were nearly spherical in shape and attached to the rGO sheet. The formation of the nanocomposite was confirmed by the detection of H[sbnd]O[sbnd]H, C[sbnd]H, C[dbnd]C, Fe[sbnd]O, and Co[sbnd]O functional groups in the CoFe2O4/rGO nanocomposite. The UV–Vis spectrum of the nanocomposite exhibited a slight red shift at the band edge. Analysis of the magnetic properties revealed that the nanocomposite exhibited ferromagnetic behavior. The CoFe2O4/rGO 5:5 nanocomposite exhibited optimal efficiency in rhodamine B photodegradation, reaching a degradation rate of 78.6 % within 120 min, with 20 min intervals. The magnetic separability of the nanocomposites permitted recycling for up to three consecutive cycles. In light of these findings, the CoFe2O4/rGO nanocomposite demonstrates considerable promise as a standalone photocatalyst for the remediation of organic contaminants in the environment. © 2024 Elsevier Ltd
Department of Physics, Universitas Gadjah Mada, Sekip Utara BLS 21, Yogyakarta, Indonesia; Department of Physics, Institut Teknologi Sumatera, Terusan Ryacudu, Way Hui, Lampung, Jati Agung, Indonesia; Department of Electronics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan; Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
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