Investigation on the Effect of Addition of Fe³⁺ Ion into the Colloidal AgNPs in PVA Solution and Understanding Its Reaction Mechanism

Abstract

Analysis of Fe3+ ion present in aqueous solutions is always of interests. Recently, this ion has been analyzed by colorimetric methods using colloid of silver nanoparticles (AgNPs) in capping agents of polymers. The reaction mechanism between AgNPs and Fe3+ is still subject to the further investigation. In this work, 1,10-phenanthroline was used to probe the reaction mechanism between AgNPs and Fe3+ ion in the solution. The colloids of AgNPs were prepared in the polyvinyl alcohol (PVA) solution and reacted with Fe3+. The colloid surface plasmon absorbance decreases linearly along with the increase in Fe3+ concentration. The addition of 1,10-phenanthroline to mixture changes the solution to red, indicating that the reaction produces Fe2+. This suggests that the reduction of the AgNPs absorbance is the result of oxidation of the Ag nanoparticles along with the reduction of Fe3+.

Antibacterial Activity of Silver Nanoparticles Capped by <i>p</i>-Aminobenzoic Acid on <i>Escherichia coli</i> and <i>Staphylococcus aureus</i>

“…The scanning speed was fast with the wavelength interval of 1 nm. The SPR absorbance was shown by the absorbance peak in wavelength around 400 nm [12][13].…”

Synthesis of Gold Nanoparticles Capped-Benzoic Acid Derivative Compounds (<i>o</i>-, <i>m</i>-, and <i>p</i>-Hydroxybenzoic Acid)

“…The synthesis of AuNPs was carried out according to Turkevich simple method [4] by mixing HAuCl4 with capping agents (o-hydroxybenzoic acid, m-hydroxy benzoic acid, p-hydroxybenzoic acid) at a volume ratio 1:1 in a water bath at 98 °C with a variation of incubation times of 5 to 60 min [10][11]. Meanwhile, the concentrations of capping agents in this research were varied from 0.01 to 0.15 M and the concentrations of HAuCl4 were varied from 10 to 100 ppm.…”

“…Polyaniline-modified gold was used for sucrose detection. PVA was used as a capping agent for the synthesis of silver nanoparticles (AgNPs), which had been previously reduced with ascorbic acid [10]. However, the use of two different compounds was not effective.…”

The Performance of p-Aminosalicylic Acid As Reducing and Stabilizing Agent in Silver Nanoparticles Synthesis

“…AgNPs were also characterized by X-Ray Diffraction (Rigaku) to confirm the crystal form of AgNPs. The XRD spectra was also used to calculate the particle size of the AgNPs by using Debye-Scherrer Equation (Equation 1) where d is average particle size (nm), K is constant (0.9), λ is the wavelength of X-ray (nm), FWHM is the full width at maxima of the peak, and θ is the Bragg angle (°) 19 .…”