| Summary: | The adsorption of Cu<sup>2+</sup> ions from an aqueous solution using AgNPs synthesized from <i>Convolvulus arvensis</i> leaf extract was investigated. The characterization of AgNPs was investigated before and after the adsorption of Cu<sup>2+</sup> ions via Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM) analyses. The adsorbent contained various functional groups in addition to the AgNPs, which contributed to the Cu<sup>2+</sup> ions adsorption. The silver nanoparticle surface consisted of spherical particles and deep pores, which adsorbed numerous Cu<sup>2+</sup> ions. The influences of dosage, pH, and contact time on adsorption of 10 and 50 mg/L Cu<sup>2+</sup> at 298 K, and initial Cu<sup>2+</sup> concentrations at 298 and 323 K were studied. It was found that the highest percentage of Cu<sup>2+</sup> ions adsorbed from an aqueous solution was 98.99%; the aqueous solution had 10 mg/L of Cu<sup>2+</sup> ions and 0.2 g of AgNPs, at pH 12 and 298 K. A pseudo-second kinetics model offered the most accurate description of the process of adsorption. The process of Cu<sup>2+</sup> adsorption more resembled a Langmuir rather than a Freundlich isotherm model, including chemical and physical mixed adsorption (mixed adsorption) processes, and was exothermic and spontaneous.
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