Abstract
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.
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Acknowledgements
The success of this research can be attributed to the Environmental Analysis Research Unit (EARU), Department of Chemistry, Faculty of Science, Chulalongkorn University.
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This work has been partially supported by the National Nanotechnology Center (NANOTEC), NSTDA, Ministry of Science and Technology, Thailand, through its program of Research Network NANOTEC (RNN).
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Anekthirakun, P., Bhawawet, N. & Imyim, A. Speciation analysis of silver ions and nanoparticles using humic-acid-modified silica and ICP-OES. Chem. Pap. 76, 7333–7342 (2022). https://doi.org/10.1007/s11696-022-02414-7
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DOI: https://doi.org/10.1007/s11696-022-02414-7