STUDY OF KINETICS AND ADSORPTION ISOTERM MODEL ON MULTI ELEMENT SOLUTION Neny Rasnyanti M Aras (a*) Saadatul Husna (a) Hermin Hardiyanti Utami (a)
Akademi Komunitas Industri Manufaktur Bantaeng
Abstract
Adsorption and ion exchange are the most eminent for removing heavy metals from aqueous solution. The activated rice husk ash as adsorbent to remove trace metals from aqueous systems has been widely investigate. The aim of this study was to examined the efficiency of chemically and thermally treated rice husk ash (RHA) with high specific surface area in adsorbing heavy metal. Batch adsorption process was carried out with initial concentration of multi element: Co, Ni, Cd, Pb by varying amount of adsorbent and reaction time under constant shaking of 50 ml sample using magnetic stirrer. The results showed, absorption in 1.5 gram with the contact time 120 min of Co, Ni, Cd, and Pb has the maximum efficiency reached to 15.9, 8.7, 7.5, and 12.7% respectively. The Langmuir equation can be used to express the adsorption capacity for adsorption of Cobalt, Nickel, Cadmium, and Lead by RHA. The capability and adsorption rate of RHA in adsorbing Cobalt are considerably higher and faster than the others. From Equilibrium data both Langmuir model with (R^{2}=0.998 ) and Freudlich model (R^{2}=1) were fit models for describing those metal adsorption reactions. The application of rice husk ash is recommended as a promising adsorbent for heavy metal (Co, Ni, Cd, and Pb) remover from aqueous solutions that showed by spontaneously process as negative values of \triangle G^{o}= -22.5 Kj/mol, -22.1 Kj/mol, -23.6 Kj/mol, -25.7 Kj/mol. Confirmation of chemical bonding between metal and adsorbent by new peak of functional groups on rice husk adsorbents conducted by FTIR, and observed major changes in the pore structure the developed rice husk adsorbents using SEM.
Keywords: Rice Husk Ash, Multi Element, isoterm adsorption, kinetics model
