MEKANISME ADSORPSI KATION Pb(II) PADA LEMPUNG CENGAR TERAKTIVASI ASAM SULFAT

Abstract

Adsorption ability of sulfuric acid activated Cengar clays (LC0.2; LC0.4 and LC0.6) has been studied by using Pb(II) cation in aqueous solutions. The adsorption experiment was performed at various contact time i.e., 5; 15; 30; 60; 70; 80; 90; 100; 110 and 120 minutes. The adsorption ability was also determined for various weight of adsorbent i.e., 0.1; 0.3; 0.5; 0.7 and 1 g at the optimum contact time. All experiments were done conditioned at 30 oC and 20 ppm of Pb(II). Atomic Absorption Spectrophotometer (AAS) was used to determine the number of Pb(II) which has been adsorbed by all clays and the results were analysed using intra-particle diffusion mechanism. The optimum contact time was observed at 90 minutes with the number of Pb(II) adsorbed by the LC0.2; LC0.4 and LC0.6 were 0.759; 0.799 and 0.827 mg/g, respectively. The optimum weight of adsorbent was 0,5 g. LC 0.6 was found to be the best clay to adsorb Pb(II) according to the intra-particle diffusion mechanism. We found that R2 for all clays were LC0.2 (0.854); LC0.4 (0.878) and LC0.6 (0.947), respectively.