Effect of Dope Solution Temperature on Characteristic and Performance of Cellulose Diacetate Membrane Based on Cellulose of Sengon Wood (Paraserianthes falcataria sp)

Abstract

Cellulose diacetate (CA) based on cellulose of sengon wood (Paraserianthes falcataria sp) have content of acetyl as much as 39,66 % have be done as polymer material on preparation of membrane by phase inversion methode. Solution dope is done by blending cellulose acetate in 18% wt of polymer concentration with dimethyl formamide as solvent at room temperature, 40oC, and 50oC. After casting and evaporating on the glass plate, the thin layer of dope solution was coagulated in water at room temperature until formed the membrane. FTIR’s analysis shows typical group absorption of carbonyl C=O in the number of wave 1751 cm-1 and group of Acetyl C-O in number wave of 1250 cm-1 . The resulting membrane morphology by Scanning Electron Microscope (SEM) JSM-5000 showed asymmetric membrane consist of top layer with dense surface skin and bottom layer are more porous. The performance of membranes tested on 1 bar trans membrane pressure. Varying of dope solution temperature affected the membrane flux and rejection produced. Highest flux obtained at a temperature of 50°C for dope solution was 362.459 L/m2.hour, while the lowest flux generated in solution at room temperature dope was 244.34 L/m2.jam. Rejection of the standard solution dextran 9500 Da range 62.13% - 69.39%, while for 12 000 Da dextran standard solution at various temperatures dope solution produces rejection> 90%.