ADSORPSI ION LOGAM Pb(II) PADA MEMBRAN MAKROPORI KITOSAN-PEKTIN TERTAUT SILANG GLUTARALDEHIDA DENGAN SiO2 SEBAGAI POROGEN; ADSORPTION OF Pb(II) METAL ION ON MACROPOROUS GLUTARALDEHYDECROSSLINKED CHITOSAN-PECTIN MEMBRANE USING SiO2 AS POROGEN

R, Ristianti Ditya, Dwi Siswanta

2016 | Skripsi | FMIPA

Adsorption of Pb(II) ions on macroporous chitosan-pectin membrane crosslinked with glutaraldehyde using SiO2 as porogen agent was investigated for the first time in this reasearch. The membrane was made by dissolving chitosan with acetic acid and pectin with distilled water at 70 °C . The solution was mixed with SiO2 as porogen and wich was dissolved by using NaOH. Membrane was characterized by SEM and FTIR and compared with non-porous chitosan-pectin membrane. The adsorption experiment was conducted in batch method with variation of porogen agent, pH, contact time and initial concentration of Pb(II). The adsorption mechanism of Pb(II) on macroporous membrane was studied by sequential desorption method. The concentration of Pb(II) before and after adsorption was determined with atomic absorption spectrometer. The results showed that macroporous chitosan-pectin membrane adsorbed more Pb(II) metal ions than that of non-pore chitosan-pectin membrane. The study of adsorption of Pb(II) on macroporous membrane exhibited optimum adsorption on membrane with SiO2:chitosan-pectin weight ratio was 3:2 (b/b) and optimum solution at pH 4. Adsorption of Pb(II) on macroporous chitosan-pektin membrane was estimated to follow pseudo-second order. Adsorption of Pb(II) on macroporous chitosan-pectin membrane followed Freundlich and Langmuir adsorption isoterm with the adsorption capacity was 250.5 mg/g. Sequential desorption studies showed that the adsorption of Pb(II) on chitosan-pectin macroporous membrane was estimated to follow a complex formation, hydrogen bond formation and physical entrapment mechanisms.

Kata Kunci : macroporous membrane, chitosan, pectin, adsorption, lead