Optimization of green-synthesized silver nanoparticles using Mimosa pudica L. for enhanced photocatalytic degradation of methylene blue: A response surface methodology approach

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Published: Mar 12, 2025
Keywords:
Silver nanoparticles Methylene blue Response surface methodology Photocatalytic degradation Mimosa pudica L.

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Pharini Chaison
Program in Applied Bioresource Science, Faculty of Interdisciplinary Studies, Khon Kaen University, Nong Khai Campus, Nong Khai 43000, Thailand
Wimonrat Tongpoothorn
Department of Chemistry, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen 40000, Thailand
Kitiyaporn Wittayanarakul
Program in Science Technology and Business Enterprise, Faculty of Interdisciplinary Studies, Khon Kaen University, Nong Khai Campus, Nong Khai 43000, Thailand
Manop Sriuttha
Program in Science Technology and Business Enterprise, Faculty of Interdisciplinary Studies, Khon Kaen University, Nong Khai Campus, Nong Khai 43000, Thailand

Abstract

Silver nanoparticles (AgNPs) were synthesized using Mimosa pudica L. leaf extract as a reducing and stabilizing agent. AgNP yield was maximized using central composite design (CCD) based on response surface methodology (RSM). An AgNO3 concentration of 3.06 mM, 732 µL extract volume, a 616 W microwave power level, and a 2.35 min reaction time were optimal conditions. Extract volume showed the highest impact on synthesis (F-value: 795.57), followed by microwave power (F-value: 168.84), reaction time (F-value: 51.38), and AgNO3 concentration (F-value: 49.72). UV-Vis spectrophotometry (UV-Vis) was used to characterize the synthesized AgNPs. A surface plasmon resonance (SPR) peak at 428 nm was observed. It was found from diffuse reflectance spectroscopy (DRS) that the bandgap is 2.34 eV. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of functional groups of plant metabolites that served as capping and reducing agents. Spherical nanoparticles with an average diameter of 7.39±2.37 nm were observed under transmission electron microscopy (TEM). XRD analysis confirmed the face-centered cubic crystalline structure of AgNPs. EDX was employed to study the elemental composition. Synthesized AgNPs were assessed as a photocatalyst for methylene blue degradation under solar light irradiation. A 79.07% conversion was achieved under optimized conditions. Kinetic studies revealed that the degradation of methylene blue followed a pseudo-second-order model with a rate constant of 0.0929 mg-1 L min-1 and R2 of 0.9990. This green synthesis is a viable, sustainable, and cost-effective way to prepare AgNPs with good photocatalytic properties.

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Chaison, P. ., Tongpoothorn, W. ., Wittayanarakul, K. ., & Sriuttha, M. (2025). Optimization of green-synthesized silver nanoparticles using Mimosa pudica L. for enhanced photocatalytic degradation of methylene blue: A response surface methodology approach. Engineering and Applied Science Research, 52(2), 159–173. retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/258321
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Vol. 52 No. 2 (2025): In progress
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ORIGINAL RESEARCH
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Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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