Highly efficient adsorption of congo red and methyl orange dyes using mesoporous α-Mn2O3 nanoparticles synthesized with Pyracantha angustofolia fruit extract

• Published in: Scientific reports Vol. 14; no. 1; pp. 18505 - 20
• Main Authors: Mousavi, Seyyed Hassan, Yaghoobi, Maliheh, Asjadi, Fatemeh
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 09-08-2024; Nature Publishing Group; Nature Portfolio
• Subjects: 639/166; 639/301; 704/172; Adsorption; Aqueous Pyracantha angustofolia extract; Color removal; Dye adsorption; Dyes; Fourier transforms; Fruits; Green synthesis; Humanities and Social Sciences; Manganese; Manganese oxides; multidisciplinary; Nanoparticles; Potassium permanganate; Pyracantha; Scanning electron microscopy; Science; Science (multidisciplinary); Water treatment; X-ray diffraction; α-Mn2O3 nanoparticles; extract; α-Mn; nanoparticles; Aqueous; Dye adsorption; Green synthesis; O
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-024-69432-1

Due to the many applications of manganese oxides in water treatment, this research aimed to synthesize α-Mn
2
O
3
nanoparticles through a green method and investigate the dye adsorption capacity of them. The α-Mn
2
O
3
nanoparticles were successfully synthesized using KMnO
4
and aqueous extract of
Pyracantha angustofolia
fruits under hydrothermal conditions and calcination. The products were identified using Fourier transform infrared (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and scanning electron microscopy (SEM) analyses. The adsorption capacity of methyl orange (MO) and Congo red (CR) dyes were evaluated at different concentrations (25, 50, and 75 ppm) using α-Mn
2
O
3
nanoparticles. Results revealed the spherical and porous structure of α-Mn
2
O
3
nanoparticles with a specific surface area of 21.7 m
2
.g
-1
. Dye removal significantly increased with pH decrement. The adsorption capacity for MO and CR was 73.07 and 70.70 mg.g
−1
, respectively. The adsorption data of both dyes followed a pseudo-second-order kinetic model. The best fitted models for MO and CR adsorption were the Langmuir isotherm and the Dubinin–Radushkevich, respectively. In addition, a possible adsorption mechanism was proposed for both dyes. The findings showed that α-Mn
2
O
3
nanoparticles are very efficient adsorbents for removing anionic dyes.