Green synthesized CoFe2O4/rGO nanocomposites utilizing plant leaf extracts as magnetically separable and reusable photocatalysts for organic toxic dye degradation
Penulis/Author
Dyah Ayu Larasati (1); DESKA LISMAWENNING P (2); NURUL IMANI I (3); Zurnansyah (4); Larrisa Jestha Mahardhika (5); Nugraheni Puspita R (6); Daiki Oshima (7); Takeshi Kato (8); Dr. Juliasih Partini, S.Si., M.Si. (9); Prof. Dr.Eng. Edi Suharyadi, S.Si., M.Eng. (10)
Tanggal/Date
1 2024
Kata Kunci/Keyword
Abstrak/Abstract
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–O–H, C–H, C––
C, Fe–O, and Co–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.
