Abstract
Synergistic effects of ion exchange and complexation in Cd(II) removal was studied by the modification of nanoparticles of clinoptilolite zeolite (NCP) by pentetic acid (diethylenetriaminepentaacetic acid: DTPA) as a family of EDTA. XRD, FT-IR, BET, TG-DTG, and SEM-EDX were used for the characterization of the NCP and NCP-DTPA. The interactions of solution pH, NCP-DTPA dosage, concentration of cadmium solution and contact time were studied by Response Surface Methodology (RSM). The pH- adsorbent dosage and pH-CCd interactions had the most important roles in the Cd(II) removal. Both Langmuir and Freundlich isotherms can model the removal results. The qm and KL were about 138.9 (mg g−1) and 0.0007 (L mg−1) for the Langmuir isotherm. The values of 1.8 and 1.06 were obtained for n and KF as Freundlich constants, respectively. The results can be well modeled by the pseudo-second-order kinetics model (r2 = 0.9986) for describing the kinetics of the process. The best run included the adsorbent dose: 0.2 g L−1, pH: 5.9, CCd: 985 mg L−1 and 205 min contacting time.
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