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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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| รหัสดีโอไอ | |
| Creator | 1. Pharini Chaison 2. Wimonrat Tongpoothorn 3. Kitiyaporn Wittayanarakul 4. Manop Sriuttha |
| Title | Optimization of green-synthesized silver nanoparticles using Mimosa pudica L. for enhanced photocatalytic degradation of methylene blue: A response surface methodology approach |
| Publisher | Faculty of Engineering, Khon Kaen University |
| Publication Year | 2568 |
| Journal Title | Engineering and Applied Science Research |
| Journal Vol. | 52 |
| Journal No. | 2 |
| Page no. | 159-173 |
| Keyword | Silver nanoparticles, Methylene blue, Response surface methodology, Photocatalytic degradation, Mimosa pudica L. |
| URL Website | https://ph01.tci-thaijo.org/index.php/easr/index |
| Website title | Engineering and Applied Science Research |
| ISSN | 2539-6161 |
| 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 ?L 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. |
