Membran selulosa asetat dari bioselulosa Nata de Coco sebagai membran mikrofiltrasi

Abstract

Cellulose acetate is one of cellulose derived from substitution of hydroxil groups (-OH) of cellulose by acyl groups. The last research resulted cellulose acetate due to acidic catalyst (H2SO4) use and open reactor. Therefore the aims of this research are to get cellulose acetate membrane from biocellulose tuna de coco (BNC) using alkaline catalyst (piridin) and inert reactor, also to characterize membrane to test membrane capability to permeate Mg2+ ion as well. Cellulose acetate make from biocellulose nata de coco (BNC) was acetylized by acetate acid anhydride and alkaline catalyst (piridin) as well as inert reactor. The cellulose acetate was analyzed by FT1R spectroscopy. Membrane characteritations such as permeability, selectivity, and maximum pore size were analyzed with microfiltration instruments, the membrane thickness by micrometer, while the solubility was determined by soaking the membrane in acetone, water and n-heksane. Cellulose acetate membrane then was applied to permeat Mg2+ ion in feed solution with different concentration. Then Mg2+ ion concentration in both feed and permeat ion solution were analyzed with AAS method. FTIR Spectra showed carbonyl (C=0) ester absorption at 1.751,2 cm-I and (C-0) ester absorption at 1.238,2 cm -1 and 1.164 cm 1. Therefore it was conclude the product was cellulose acetate. Membrane characterization showed, that membrane permeability, membrane selectivity, maximum pore size and thickness membrane were in the range of 6,25-889,28 Lm-2atm-ijam-1, 22,08-94,61()/0, 1,85-19,1 gm, and 1,51.10-2-5,55.10-2 gm, respectively. The membrane was spuring by dissolve in water. Finally at a constan pressure, the percentage of membrane to permeate Mg2+ ion decrease when Mgt{ ion concentration increased.