ADSORPSI ION Pb(II) PADA MEMBRAN MAKROPORI KITOSAN–KARBOKSIMETIL; SELULOSA TERTAUT SILANG GLUTARALDEHIDA ADSORPTION OF Pb(II) ION ON GLUTARALDEHYDE–CROSSLINKED MACROPOROUS CHITOSAN–CARBOXYMETHYL CELLULOSE MEMBRANE

RATRI, OKTI RESTUNING, Dwi Siswanta

2016 | Skripsi | FMIPA

Adsorption of Pb(II) ion on macroporous chitosan–carboxymethyl cellulose (CMC) membrane using glutaraldehyde as crosslinker agent and SiO2 as porogen has been conducted. Macroporous membrane was synthesized by mixing 1% chitosan solution (w/v) and 0,1% CMC solution (w/v) then adding SiO2 and glutaraldehyde. The solution was evaporated at 70 °C. Natrium hydroxide was added into membrane to release SiO2. The membranes were characterized by using FTIR spectrophometer and SEM. The adsorption experiment was conducted in batch method by giving variations to chitosan–CMC composition, contact time, pH, initial concentration of Pb(II) ion and the amount of porogen. The adsorption mechanism of Pb(II) ion by macroporous membrane was determined by sequential desorption method. The results showed that membrane has reached optimum conditions to adsorp Pb(II) metal ion on chitosan–CMC composition of 3:7, contact time of 45 min, solution pH of 5, Pb(II) initial concentration of 200 ppm and 25% porogen. Pb(II) ion adsorption by macroporous membrane adsorption followed pseudo second order kinetics with k value of 0.0244 g mg–1 min–1 and Freundlich isotherm model with adsorption capacity value of 40.61 mg g–1. Sequential desorption method showed that Pb(II) adsorption mechanism was through formation of complex, physical entrapment and hydogen bond mechanism.

Kata Kunci : macroporous membrane, adsorption, lead, isotherm