Abstract
The present study focuses on the adsorption efficiency of nanomagnetic Fe3O4@CQDs/Si(OEt)(CH2)3NH/CC/PEG-400 (Fe3O4@CQDs/NH/CC/PEG-400) as an adsorbent for Cu2+ and Zn2+ removal from the contaminated solutions through the adsorption technique. The effect of pH, contact time, and adsorbent dosage in the 45 ppm concentration of Cu2+ and Zn2+ solutions was also evaluated. By increasing the concentration at pH = 7 and the contact time of 120 min, the adsorption capacity increases so that the maximum adsorption capacity of Cu2+ and Zn2+ ions is 219.9 and 159.2 mg/g, respectively. Based on the correlation coefficient (R2), the Langmuir isotherm and the pseudo-second-order models were selected. The proposed mechanisms of adsorbent are the formation of complexes, interparticle diffusion, ion exchange interaction, and electrostatic interaction. The results show that adsorbent can be used in five cycles with 91% removal efficiency.
Published Version
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