Adsorpsi Ion Logam Tembaga Menggunakan Nano Zeolit Alam yang Diaktivasi

Abstract

This study was aimed to find out the ability of natural zeolite coming from Blang Pidie, South West Aceh District, Aceh Province, Indonesia, which was applied as an adsorbent to adsorp heavy metal copper (Cu²⁺) ions in aqueous solution. This research was conducted to enhance the performance of natural zeolite by downsizing it to nano particles, then activated physically and chemically using 0.05 M HCl, then calcined at temperature 350°C for 2 hours. Test of Cu²⁺ metal ion adsorption to nano natural zeolite after activation was done by batch method to determine the effect of contact time, weight of the adsorbent, pH, and initial concentration. The results showed that the optimum adsorption at the initial concentration 38.998 mg/L, weight adsorbent 1 gram, pH 6 during 120 minutes of the contact time with the percentage metal ion Cu²⁺ adsorption up to 99.86% and adsorption capacity 7.789 mg/g. Isothermal adsorption ressembled with the isotherms Freundlich with the R² value of 0.9685, Freundlich constants (Kf) 111.99 mg/g and n value 0.986. The kinetic studies indicated that the adsorption of metal ions Cu²⁺ could be described by pseudo second order kinetic model with linear regression value 0.9997 and a constant value 0.121 min-1.