期刊
AGRONOMY-BASEL
卷 12, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/agronomy12102505
关键词
biogenic; leaf extract; dye removal; bimetallic NPs; green synthesis
资金
- Umm Al-Qura University [22UQU4320141DSR53]
- Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia [PNURSP2022R7]
In this study, green synthesized cobalt nanoparticles and cobalt-zinc bimetallic nanoparticles were successfully prepared and characterized. The cobalt nanoparticles and cobalt-zinc bimetallic nanoparticles showed excellent antioxidant activity and demonstrated the ability to remove methylene blue dye. However, their anti-inflammatory activity was not as significant due to the interference of secondary metabolites.
In this work, green synthesized cobalt monometallic and cobalt-zinc bimetallic NPs were prepared by bioreduction of metallic salts with Cymbopogan citratus plant extract. Biosynthesized cobalt nanoparticles (NPs) and cobalt-zinc bimetallic NPs were characterized using diverse techniques such as FTIR, UV-Visible spectroscopy, SEM, XRD, and EDX analyses. UV-visible spectra for green-synthesized cobalt monometallic and cobalt-zinc bimetallic NPs were in the range between 300 to 350 nm, which confirmed the formation of stable monometallic and bimetallic NPs. The average particle size of CoNPs calculated by XRD analysis was found to be 22.77 nm and that of Co-Zn BMNPs was 14.8 nm. Different functional groups in the Cymbopogan citratus plant extract, which served as a reducing and stabilizing agent for NPs, were identified by FTIR spectra. Cobalt NPs and cobalt-zinc bimetallic NPs were used in the evaluation of antioxidant, anti-inflammatory, and dye degradation activity. Green-synthesized cobalt monometallic NPs and cobalt-zinc bimetallic NPs exhibited excellent antioxidant activity with the scavenging of DPPH free radicals. Green synthesized cobalt NPs and cobalt-zinc bimetallic NPs were utilized for the removal of methylene blue (MB) dye. Different parameters such as the effect of temperature, pH, and dye concentration on adsorbent doses were analyzed and optimized. The best dye removal percentage was obtained with Co-Zn BMNPs compared with CoNPs. Cobalt NPs and cobalt-zinc bimetallic NPs did not display good anti-inflammatory activity because of the presence of secondary metabolites which inhibited them to react with proteins.
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