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Speciation analysis of silver ions and nanoparticles using humic-acid-modified silica and ICP-OES

Pimpimon Anekthirakun, Nakara Bhawawet, and Apichat Imyim

Department of Chemistry, Faculty of Science, Siam University, Bangkok, Thailand



Received: 27 April 2022  Accepted: 5 August 2022


Humic-acid-modified silica was prepared via immobilization of humic acids onto aminopropyl-silica (SiAP-HA). These environmentally friendly materials could be used for the separation of silver ions, Ag(I), and silver nanoparticles (AgNPs) from an aqueous solution. The extraction of Ag(I) using SiAP-HA was achieved at the optimum pH of 3, while AgNPs remained in the solution. The adsorption behavior of Ag(I) was described by the Langmuir model at 298 K, with a maximum adsorption capacity of 31.3 mg/g. The desorption of Ag(I) was successful using 0.1 M nitric acid solution. After solid-phase separation, both silver species were determined by an inductively coupled plasma-optical emission spectrometer (ICP-OES) with good accuracy and precision.

Keywords: Humic acids; Modified silica; Speciation; Silver ions; Silver nanoparticles

Full paper is available at

DOI: 10.1007/s11696-022-02414-7


Chemical Papers 76 (12) 7333–7342 (2022)

Wednesday, February 21, 2024

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