2017 : Fabrication and Characterization of Biocomposite Cellulose Acetate/Poly(L-Lactic Acid) Bead as Biodegradable Adsorbent

Prof. Dr. Ir. Achmad Roesyadi M.Sc
Hikmatun Nimah S.T., M.Sc.Ph.D

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The aim of this work is to prepare biocomposite porous bead from blend of poly(L-Lactic Acid) and Cellulose Acetate, PLLA and CA, using solvent blending and solution injection technology and to investigate their properties and performance in adsorption process for dye separation. The relation of CA/PLLA beads properties and their performance in dye adsorption process is also evaluated by varying the condition of beads development, which is weight ratio of CA/PLLA and concentration of the polymer mixture solution. The weight ratio of CA/PLLA is varied= 100/0; 90/10; 80/20; 70/30; 60/40. In addition, the polymer mixture concentration is also varied= 10 wt% and 15 wt%. The procedure of bead manufacturing is explained as following: CA is dissolved in the solvent mixture of acetone and dimethyl sulfoxide (DMSO) with specific ratio to form CA solution. In other bottle, PLLA is dissolved in chloroform to form PLLA solution. Then, CA solution and PLLA solution are mixed together until obtaining homogeneous CA/PLLA solution. The CA/PLLA solution is then slowly injected into bath coagulation which contain of water to form spherical beads. The obtained bead is then immersed in NaOH solution for one night at room temperature and then washed with water and dried in oven at 45oC for 24 hours. The beads properties in term of morphology [by scanning electron microscopy (SEM)], molecular interaction [by fourier transform infra-red (FTIR)], thermal properties [by differential scanning calorimetric (DSC)], pore size distribution and surface area (by BET), thermal stability [by thermogravimetric analysis (TGA)] and surface morphology [by atomic force microscopy (AFM)] are also investigated. Some characterizations which are difficult to find in Indonesia will be sent to NCKU, Taiwan as our partner in this research. Bead performance in dye adsorption is also evaluated by measuring dye concentration before and after adsorption by using UV-VIS. Thus, the bead capacity and % dye removal can be measured. Our partner in this research is Prof. Eamor Woo from Chem.Eng. NCKU, Taiwan. They will have contribution in helping characterization, supplying PLLA material and guiding publication submission. The result of this experiment project will be submitted to Scopus or Thomson Reuther-indexed journal and published in Scopus-indexed international conference. Undergraduate student’s final project is also to be the outcome of this research project.