Humic Acid Functionalized - Silver Nanoparticles as Nanosensor for Colorimetric Detection of Copper (II) Ions in Aqueous Solutions

Abstract:

Humic acid - functionalized silver nanoparticles (HA-AgNPs) were successfully synthesized and used to detect Cu (II) ions in aqueous solutions. The HA-AgNPs was shown to have an average hydrodynamic diameter of 101.4 nm and a polydispersity index of 0.447. The absorbance spectra of HA-AgNPs showed the characteristic local surface plasmon resonance (LSPR) peak of AgNPs at 408.3 nm. Addition of Cu (II) in the HA-AgNPs led to their agglomeration as evidenced by the change in their surface morphology and their corresponding optical absorbance spectra. The synthesized HA-AgNPs showed a strong linear response for Cu (II) concentrations in the range of 0.00 – 1.25 mM with a limit of detection (LoD) of 4.4428 ± 0.1091 mg L^-1, a limit of quantification (LoQ) of 14.8094 ± 0.3636 mg L^-1, and a limit of blank (LoB) of 0.1214 ± 0.0065 mg L^-1. Statistical analysis showed that this calibration curve could be used to quantify Cu (II) concentrations within a 95% confidence level. Furthermore, HA-AgNPs was found to be selective for Cu (II) detection based on the selectivity study against common metal ions found in drinking water. This shows that the synthesized HA-AgNPs can be used as an environment-friendly colorimetric nanosensor for rapid and point-of-need quantification of Cu (II) ions in aqueous media.

• Periodical: Key Engineering Materials (Volume 831)
• Pages: 142-150
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.831.142
• Online since: February 2020
• Authors: Edgar Clyde R. Lopez, Michael Angelo Zafra, Jon Nyner L. Gavan, Emil David A. Villena, Francis Eric P. Almaquer, Jem Valerie D. Perez*
• Keywords: Colorimetric Detection, Functionalized Silver Nanoparticles, Humic Acid, Nanosensor

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