JMPROV!JVG THE HYDROPHJLICJTY OF POLY(VJNYLJDENE FLUORIDE) MEMBRANES BY BLENDING WITH CELLULOSE ACETATE FOR FILTRATION OF DYES

• Main Author: Reza, Muhammad
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/37793
• Institution: Institut Teknologi Bandung

Membrane technology is a clean technology for mrious separation processes,because it has high efficiemy, easy application and maintenance and does not consume much energy. in general, memhranes are made ofpo ymers. one of them is poly(vinylidene fluoride) (PfDF). PfDF is one of synthetic po rmer widely used as commercial microfiltration and ultrafiltration memhranes. Besides its high physical, chemical and mechanical properties, this po vmer h, also 1•ery easily mod{fied through simple process like blending with other organic polymers. l !nfortunate r. this po(vmer is hydrophobic and conseque!lfly, it has low.flux in aqueous system and createsfouling on the surface and e1•en on the internal part of the membranes, resulling in lmr membrane pe1jormance duringfiltralion process. Therefore, the aims of this research were to improt•e the hydrophilicity of the memhranes, to reduce the fouling phenomena and to optimi::e the performance of PDI 'F membranes for the filtration of dyes. So, in this study, P VF was hlended with hydrophilic cellulose acetate (CA) with mried concentrations ranging between I and 10 (%wt). Those membranes were prepared t•ia phm•e itll'enion method using N,N-dimethylacetamide (DMAc) as soh•ent and water as coaxulant (11onsoh•enl). The effects of blend ratio on membmne hydrophilicity 11'ere im•estif{ated through water collfacl angle, porosity. and beta fraction D(fferent techniques .\uch as mechanical strength, ,)'J:;M, A TR­ Fllf? and filtration experiment (?f water and dyes were applied to eraluate the characteristics and pe1jormance of membranes. It was found that the PT'DF-CA membranes were more hydrophilic compared to pristine Pl 'DF membrane. In other words, the addition qf CA increa •ed the memhrane surface hydrophilicity, porosity, pore si::e and beta fraction. n1e water flux increased along with CA concemration up to 5% ( 4, but decreased again in higher CA. This result li ' CIS COI? firmed by porosity and beta fraction measurement which showed the .ame tendency. On the other hand, the addition qf CA increased the memhrane pore si::e and decreased the rejection percemage. So, hy using membranes with 5% ( 'A, em optimum performance was achie1•ed during the.filtration of metl ylene hlue (MB) and Acid Yellow 17 (AY): with a rejection of 90.1-1% and 65.67%, respectil'ely. It sho11'ed that blend membranes were more selecth•e toMB !han AY surface has negative charges, its adhesion to methylene blue as cationic dye H'as stronger than to Acid Yellow as anionic dye. It was also found that the increased membrane hydrophilicity also reduced total fouling ratio on the membrane smface, indicated by the increased flux recovery ratio (FRR). Reversible fouling ratio was also increased, whereas the irre1•ersihle fouling ratio was decreased. It showed that the addition of CA improved the fouling resistance of membranes. So, hased on the experimental results, it can be concluded that the addition of CA increased the membrane hydrophilicity, reduced the fouling phenomena and optimi::ed the performance qf PT 'DF memhranesforfiltration of dyes.