Concentration Dependent Photocatalytic Degradation of Methylene Blue Using Green Synthesized Fe₃O₄/ Cdots Nanocomposites Utilizing Moringa Oleifera Leaf Extracts

Abstract:

Fe₃O₄/CDots nanocomposites by combining Fe₃O₄ synthesized using Moringa oleifera extract and CDots produced from watermelon rinds have been successfully carried out. The Fe₃O₄/CDots nanocomposites with various CDots concentration was carried out through a sonication process. Test results using an X-ray diffractometer show that the crystal structure of the nanocomposite is a cubic inverse spinel. The presence of CDots resulted in a decrease in the size of Fe₃O₄ crystallites from 10.6 nm to 8.4 nm. Fourier transform infrared analysis confirmed the formation of Fe₃O₄/CDots nanocomposites with the appearance of Fe-O and C=C functional groups. The absorbance spectrum of the nanocomposite shows a dominant profile of Fe₃O₄/CDots, with an increase in band gap energy by the increase of CDots concentration in the range of 2.65 – 2.77 eV. The attachment of CDots to Fe₃O₄ is indicated by the luminescence produced in the photoluminescence test. The magnetic properties of Fe₃O₄ and Fe₃O₄/CDots nanocomposites show superparamagnetic characteristics with saturation magnetization values ​​of 54.2 emu/g and 34.3 emu/g, respectively. The magnetic properties of Fe₃O₄/CDots nanocomposites can support the separation feature of the liquid phase with the help of an external magnet. In testing photocatalytic activity, it was able to degrade methylene blue organic dye waste up to 96.7% in 10 minutes of UV radiation. Therefore, Fe₃O₄/CDots have potential as promising heavy metal removal agents and photocatalysts for effective and efficient environmental remediation.

• Periodical: Key Engineering Materials (Volume 1013)
• Pages: 119-127
• DOI: https://doi.org/10.4028/p-63fVxs
• Online since: May 2025
• Authors: Citra Dwi Lestari*, Nurul Imani Istiqomah, Emi Kurnia Sari, Edi Suharyadi, Hasniah Aliah
• Keywords: Fe₃O₄/ Cdots Nanocomposite, Green Synthesis, Methylene Blue, Moringa Oleifera, Photocatalyst

References

[1] M. Behera, J. Nayak, S. Banerjee, S. Chakrabortty, and S. K. Tripathy, "A review on the treatment of textile industry waste effluents towards the development of efficient mitigation strategy: An integrated system design approach," J. Environ. Chem. Eng., vol. 9, no. 4, p.105277, 2021.

DOI: 10.1016/j.jece.2021.105277

[2] M. Imran et al., "Highly photocatalytic active r-GO/Fe3O4 nanocomposites development for enhanced photocatalysis application: A facile low-cost preparation and characterization," Ceram. Int., vol. 47, no. 22, p.31973–31982, 2021.

DOI: 10.1016/j.ceramint.2021.08.083

[3] T. Zeng, Y. Chen, X. Su, Y. Li, and Q. Feng, "Hydrothermal steam induced crystallization synthesis of anatase TiO2 nanoparticles with high photovoltaic response," Mater. Lett., vol. 119, p.43–46, 2014.

DOI: 10.1016/j.matlet.2013.12.100

[4] A. Raza, S. Altaf, S. Ali, M. Ikram, and G. Li, "Recent advances in carbonaceous sustainable nanomaterials for wastewater treatments," Sustain. Mater. Technol., vol. 32, p. e00406, 2022.

DOI: 10.1016/j.susmat.2022.e00406

[5] X.-Y. Jiao, L. Li, S. Qin, Y. Zhang, K. Huang, and L. Xu, "The synthesis of fluorescent carbon dots from mango peel and their multiple applications," Colloids Surfaces A Physicochem. Eng. Asp., vol. 577, p.306–314, 2019.

DOI: 10.1016/j.colsurfa.2019.05.073

[6] G. S. Das, J. P. Shim, A. Bhatnagar, K. M. Tripathi, and T. Kim, "Biomass-derived Carbon Quantum Dots for Visible-Light-Induced Photocatalysis and Label-Free Detection of Fe(III) and Ascorbic acid," Sci. Rep., vol. 9, no. 1, p.15084, 2019.

DOI: 10.1038/s41598-019-49266-y

[7] A.-C. Sun, "Synthesis of magnetic carbon nanodots for recyclable photocatalytic degradation of organic compounds in visible light," Adv. Powder Technol., vol. 29, no. 3, p.719–725, 2018.

DOI: 10.1016/j.apt.2017.12.013

[8] E. K. Sari, R. M. Tumbelaka, H. Ardiyanti, N. I. Istiqomah, Chotimah, and E. Suharyadi, "Green synthesis of magnetically separable and reusable Fe3O4/Cdots nanocomposites photocatalyst utilizing Moringa oleifera extract and watermelon peel for rapid dye degradation," Carbon Resour. Convers., vol. 6, no. 4, p.274–286, 2023.

DOI: 10.1016/j.crcon.2023.04.003

[9] D. Fouad et al., "A Novel Drug Delivery System Based on Nanoparticles of Magnetite Fe3O4 Embedded in an Auto Cross-Linked Chitosan," IntechOpen, 2020, [Online]. Available:

DOI: 10.5772/intechopen.94873

[10] H. Bahrulolum et al., "Green synthesis of metal nanoparticles using microorganisms and their application in the agrifood sector," J. Nanobiotechnology, vol. 19, no. 1, p.86, 2021.

DOI: 10.1186/s12951-021-00834-3

[11] A. K. Prajapati and M. K. Mondal, "Green synthesis of Fe3O4-onion peel biochar nanocomposites for adsorption of Cr (VI), methylene blue and congo red dye from aqueous solutions," J. Mol. Liq., vol. 349, p.118161, 2022.

DOI: 10.1016/j.molliq.2021.118161

[12] S. Yousefinejad, H. Rasti, M. Hajebi, M. Kowsari, S. Sadravi, and F. Honarasa, "Design of C-dots/Fe3O4 magnetic nanocomposite as an efficient new nanozyme and its application for determination of H2O2 in nanomolar level," Sensors Actuators, B Chem., vol. 247, p.691–696, 2017.

DOI: 10.1016/j.snb.2017.02.145

[13] P. M. Kouotou, A. El Kasmi, L. N. Wu, M. Waqas, and Z. Y. Tian, "Particle size-band gap energy-catalytic properties relationship of PSE-CVD-derived Fe3O4 thin films," J. Taiwan Inst. Chem. Eng., vol. 93, p.427–435, 2018.

DOI: 10.1016/j.jtice.2018.08.014

[14] A. C. Sun, "Synthesis of magnetic carbon nanodots for recyclable photocatalytic degradation of organic compounds in visible light," Adv. Powder Technol., vol. 29, no. 3, p.719–725, 2018.

DOI: 10.1016/j.apt.2017.12.013

[15] H. I. Saleh, "Green Synthesis of Magnetite Nanoparticles using MyrtuscommunisL. Grown in Egypt," Int. Res. J. Innov. Eng. Technol., vol. 4, no. 9, p.06–13, 2020.

DOI: 10.47001/irjiet/2020.409002

[16] M. Sundararajan, V. Sailaja, L. John Kennedy, and J. Judith Vijaya, "Photocatalytic degradation of rhodamine B under visible light using nanostructured zinc doped cobalt ferrite: Kinetics and mechanism," Ceram. Int., vol. 43, no. 1, p.540–548, 2017.

DOI: 10.1016/j.ceramint.2016.09.191