KESETIMBANGAN ADSORPSI Pb(II) PADA LEMPUNG ALAM DESA TALANAI KABUPATEN KAMPAR

Abstract

Heavy metal removal into environment causes serious of soil, endangering the quality of water and natural resources used for human consumption, therefore need to be a way to reduce the heavy metal by adsorption method. Adsorbent are used commonly activated carbon, clay, seaweed and marine algae. This study used natural clay as an adsorbent from Talanai village due to easily available, inexpensive, and has a high enough capacity to redeem the levels of heavy metal ions. Natural clays are heated 105oC used to adsorb Pb metal by the influence of contact time, concentration, temperature, weight of adsorbent and pH in order to study the adsorption equilibrium of natural clay. The method for the adsorption is batch method, in which adsorbate is mixed with an adsorbent and then filtrate was separated by centrifuge. Then the filtrate was directly analyzed by SSA. The results showed that the optimum contact time obtained is 15 minutes, the concentration of 20 ppm, a temperature of 60oC, weight of 1 g and a pH optimum adsorption at pH 6. Adsorption equilibrium models can be represented by the Langmuir equilibrium model of the value of R2 is 0.999. Adsorption type used in this study is physical adsorption (fisisorpsi) which is characterized by a low value of ΔH and positive that is 6.254 kJ / mol and ΔS = 12.35 J / mol K. ΔH is positive that indicates that the reaction is endothermic. ΔG also is positive the value is 2.511 kJ / mol, can be concluded that the reaction is not spontaneous