Synthesis of chitosan-silver nanoparticles for colorimetric detection of Hg2+ and Pb2+ ions in aqueous medium [manuscript]

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dc.contributor.authorDIOLINA CHRISTINE CASTRO OLARTE
dc.date.accessioned2026-05-25T00:15:46Z
dc.date.available2026-05-25T00:15:46Z
dc.date.issued2017
dc.description.abstractBackground: In recent years, silver nanoparticles has been synthesized using plant extracts and polysaccharides and used for colorimetric detection of different metal ions. In this study, chitosan was used to synthesize and stabilize silver nanoparticles and were applied for the colorimetric detection of Hg2+ and Pb2+ ions. Methods: Chitosan-silver nanoparticles (CAgNPs) were synthesized by mixing chitosan solution, sodium hydrozide solution, and silver nitrate. The nanoparticles were characterized by UV-Visible Spectroscopy, Fourier-Transform Infrared Spectroscopy, Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy. Synthesized CAgNPs were used to detect Hg2+ and Pb2+ ions. Changes in absorbance and morphology of CAgNPs after the addition of metal ions were evaluated. Results: Chitosan-silver nanoparticles were synthesized after mixing 48 mL of chitosan solution with 150 mL odf sodium hydroxide solution and 2 mL od silver nitrate solution at 30˚C and pH 12.38 for 90 min. Formation of CAgNPs was confirmed using UV-Vis, FTIR and EDX Spectroscopy, and SEM. Based on the analyses, CAgNPs have average diameter size of 52.03±6.72 nm. FTIR analyses of the CAgNPs showed decrease in intensity for N-H vibrations because of the attachment of silver. CAgNPs were found to be more sensitive ro Pb2+ ions than Hg2+ ions. SEM images showed that CAgNPs agglomerated after the addition of metal ions. Conclusion: Synthesized chitosan-silver nanoparticles can be used for colorimetric detection of Hg2+ and Pb2+ ions in aqueous medium.
dc.identifier.urihttp://granarium.clsu.edu.ph/handle/123456789/1367
dc.language.isoen_US
dc.relation.supervisorDANILA S. PARAGAS
dc.titleSynthesis of chitosan-silver nanoparticles for colorimetric detection of Hg2+ and Pb2+ ions in aqueous medium [manuscript]
dc.typeTechnical Report
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