Abstract
The adsorption of Cu(2+)ions from an aqueous solution using AgNPs synthesized fromConvolvulus arvensisleaf extract was investigated. The characterization of AgNPs was investigated before and after the adsorption of Cu(2+)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(2+)ions adsorption. The silver nanoparticle surface consisted of spherical particles and deep pores, which adsorbed numerous Cu(2+)ions. The influences of dosage, pH, and contact time on adsorption of 10 and 50 mg/L Cu(2+)at 298 K, and initial Cu(2+)concentrations at 298 and 323 K were studied. It was found that the highest percentage of Cu(2+)ions adsorbed from an aqueous solution was 98.99%; the aqueous solution had 10 mg/L of Cu(2+)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(2+)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.