Biosynthesis of Mn3O4/PVP Nanocomposite for Enhanced Photocatalytic Degradation of Organic Dyes Under Sunlight Irradiation

• Published in: Journal of cluster science Vol. 35; no. 1; pp. 201 - 215
• Main Authors: Salmi, Chaima, Souhaila, Meneceur, Salah Eddine, Laouini, Mohammed, Hamdi Ali Mohammed, Hasan, Gamil Gamal, Mahboub, Mohammed Sadok
• Format: Journal Article
• Language: English
• Published: New York Springer US 2024; Springer Nature B.V
• Subjects: Adsorption; Biosynthesis; Bromophenol blue; Catalysis; Chemical synthesis; Chemistry; Chemistry and Materials Science; Dyes; Energy; First principles; Fourier transforms; Infrared analysis; Inorganic Chemistry; Leaves; Manganese oxides; Nanochemistry; Nanocomposites; Nanoparticles; Nitrates; Original Paper; Oxidation; Performance degradation; Photocatalysis; Photodegradation; Physical Chemistry; Pollutants; Pollution; Polyvinylpyrrolidone; Toluidine blue; Ultraviolet radiation; Wastewater treatment; Water treatment; Algeria; Photocatalytic degradation; Mn; Adsorption energy; Green synthesis; Nanocomposite; PVP; Organic dyes; O
• ISSN: 1040-7278; 1572-8862
• DOI: 10.1007/s10876-023-02475-y

Dye pollution resulting from the discharge of untreated wastewater has become a major environmental concern. In this study, we propose a green and cost-effective approach for the photocatalytic degradation of dye pollutants using a nanocomposite (NC) of manganese oxide (Mn
3
O
4
) modified with polyvinylpyrrolidone (PVP). The Mn
3
O
4
nanoparticles (NPs) were synthesized through a green method using a biogenic extract of
Pistacia lentiscus
leaves. The resulting Mn
3
O
4
NPs were then modified with PVP, a non-ionic polymer, to enhance their stability and catalytic performance. The synthesized Mn
3
O
4
/PVP NC was characterized using various analytical techniques, including Fourier transform infrared spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy. The findings showed that the Mn
3
O
4
NPs and Mn
3
O
4
/PPV NC exhibit spherical morphology with an average size of 37 nm and 45 nm, respectively. The Mn
3
O
4
NPs and Mn
3
O
4
/PVP NC exhibited optical bandgap energies of 1.8 eV and 1 eV, indicating the effective use of these NPs as photocatalysts. The nanocomposite exhibited exceptional catalytic performance in degrading bromophenol blue (BPB) and ortho-toluidine blue (O-TB), achieving degradation rates of 98% and 95% within 75 minutes. In comparison, Mn
3
O
4
NPs showed lower efficiencies with approximately 14% degradation for BPB and 6% for O-TB. Optimal conditions for dye degradation and subsequent cycles were determined, and first-principles calculations revealed insight into the adsorption energy between the dyes and the Mn
3
O
4
/PVP surface. This study highlights the potential of Mn
3
O
4
/PVP nanocomposite as an effective and eco-friendly catalyst for dye pollutant degradation, offering a promising solution for wastewater treatment across industries.