Title: Natural Zeolite as An Adsorbent for Pb (II) and Cu (II) Metal ions: Study of the Effect Acid Types on Zeolite Activation
Authors: Sriatun and W. Kusuma
Volume: 9
Issue: 5
Pages: 316-321
Publication Date: 2025/05/28
Abstract:
Rapid industrial development causes increasing industrial waste, such as Pb (II) and Cu (II) metal ions. Porous adsorbents such as natural zeolite can reduce the concentration of both metal ions in waste. This study aims to improve the ability of natural zeolites to adsorb Pb (II) and Cu (II) metal ions through acid activation. Natural zeolite with homogeneous size is activated using HCl and HNO3 acids. Natural zeolite and acid-activated zeolite are characterized by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffractometer (XRD). Furthermore, activated zeolite reduces Pb (II) and Cu (II) metal ions. The results of the study showed that zeolite that had been activated by HCl and HNO3 acids did not experience structural damage because the diffractogram pattern did not change, namely at 2? = 22.34°; 25.72°; 26.39°; and 27.77°. The FTIR spectra support the data with the emergence of Si-O-Si groups at wavenumbers 1000 - 1200 cm-1. Meanwhile, the adsorption capacity of Pb(II) metal ions and Cu(II) metal ions by natural zeolite is smaller than acid-activated zeolite.