Pembuatan dan karakterisasi membran datar selulosa Asetat untuk mikrofiltrasi.

Abstract

Telah dibuat membran dater selulosa asetat untuk rnikrofiltrasi. Membran dibuat dari bahan polimer selulosa asetat, pelarut aseton, air sebagai non pelarut, aditif PEG-400, PEG-4000 dan LiC1, dengan waktu penguapan 5, 10 dan 15 detik. Kemudian membran dikarakterisasi dengan menguicur fluks air, rejeksi terhadap lanitan sukrosa, ketebalan membran dan diameter pori maksimum. Dan sebagai aplikasinya membran digunakan untuk penjernihan air sungai Kaligarang. Semakin besar konsentrasi polimer atau semakin kecil konsentrasi aditif dan semakin singkat waktu penguapan maka membran yang terbentuk mempunyai sifat permeabilitas yang semakin kecil tetapi sifat selektifitas yang semakin besar. Finks membran paling besar adalah 169,46 L m-2jarn-latm-1 untuk komposisi larutan cetak %polimer : %pelonit : %aditif = 7 : 84 : 9, dengan aditif PEG-4000 dan waktu penguapan 15 detik. Sedangkan rejeksi terhadap larutan sukrosa yang paling besar adalah 9,58% untuk komposisi larutan cetak %polimer : %pelarut : %aditif -= 10 : 84 : 6, dengan aditif PEG-400 dan waktu penguapan 5 detik Dalam aplikasinya, membran mampu menghilangkan kekeruhan antara 96,27% - 99,78%, senyawa organik pada absorbansi UV 260 nm 84,20% - 91,78% dan logam Ca antara 31,52% - 77,735%. Dapat disimpulkan bahwa dengan pengahiran komposisi larutan cetak dan waktu penguapan dapat dibuat membran dengan sifat yang tertentu. It had been made flat-sheet membranes from cellulose acetate for microfiltration. The membranes were prepared from the polymer of cellulose acetate, acetone as solvent, water as non solvent, PEG-400, PEG-4000 and LiC1 as additives, with evaporation time 5, 10 and 15 second. Then the membranes were characterized by determining the flux, the rejection of sucrose solution, the membrane thickness and the maximum pore diameter. And the membranes were applied for water purification of Kaligarang river. The increasing of the polymer concentration would decrease the permeability of the formed membranes. The decreasing of the additive concentration would decrease the permeability of the formed membranes. The decreasing of the evaporation time would decrease the permeability of the formed membranes. The decreasing of the membrane's permeability would increase its selectivity. The highest flux was 169,46 L rn-2h-tatm-1 for the casting solution with composition %polymer : %solvent : %additive -- 7 : 84 : 9, with PEG-4000 as additive and evaporation time 15 second. And the highest rejection of sucrose solution was 9,58% for the casting solution with composition %polymer : %solvent : %additive = 10 84 : 6, with PEG-400 as additive and evaporation time 5 second. And in the application, the membranes could reduce the turbidity until to 96,27% - 99,78%, organic compounds on UV absorbance at 260 nm 84,20% - 91,78%, and Ca metal 31,52% -77.,735%. It could be concluded that the membrane with specific characteristics could be made by regulating the composition of the casting solution and the evaporation time. This doci.iment is Undip Institutional Repository Collection. The author(s) or copyright owner(s) agree that UNDIP-IR may, without changing the content, submission to any medium or format for the purpose of preservation. The author(s) or copyright owner(s) also agree that UNDIP-IR may keep more than one submission for purposes of security, back-up and preservation. ( http:fieprints.undip.ac.id)