Karakteristik Membran Asimetris Polietersufone (PES) dengan Pelarut Dimetil Formamide dan N-Metil-2-Pyrolidone - (Characteristic of Poliethersulfone (PES) Asymmetric Membrane with Dimethyl Formamide and N-Methyl Pyrolidone as Solvent)

Sri Mulyati, Fachrul Razi, Zuhra Zuhra

Abstract


Membrane that is generally used for separation process could be made using phase inversion technique. This research aims to create polyethersulfone (PES) asymmetric membranes via phase inversion technique using solvent and Trans Membrane Pressure (TMP) as variable. SEM analysis indicated that membranes had asymmetric structure that consits of two layers which denser skin layer on the top surface and the porous support on the bottom. PES/DMF membrane showed larger pore structure than PES/NMP. The permeability coefficients of both membranes were in the ultrafiltration range. The coefficient permeability (Lp) of PES/DMF membrane was 35.769 L/m2.hour, much greater compared to PES/NMP membrane which was 15.364 L/m2.hour.bar. Molecular Weight Cut-Off (MWCO) of PES/DMF membrane was 177 Kda, meanwhile PES/NMP was 186 Kda. Performances of the membranes were evaluated  using dextrane as feed solution. PES/DMF membrane resulted in an higher flux and lower rejection than PES/NMP.

Keywords: asymmetric membrane, membrane performance, Molecular Weight Cut-Off (MWCO), morphology, permeability

 

ABSTRAK

Membran yang umumnya digunakan untuk proses pemisahan dapat dibuat menggunakan teknik inversi fasa. Penelitian ini bertujuan untuk mengetahui karakteristik membran asimetris polietersulfone (PES) yang dibuat menggunakan teknik inversi fasa dengan variabel jenis pelarut dan Trans Membrane Pressure (TMP). Hasil analisis Scanning Electron Microscopy (SEM) terhadap morfologi membran membuktikan bahwa membran yang dihasilkan merupakan membran asimetris yang terdiri dari dua lapisan yaitu bagian atas merupakan lapisan tipis dan lapisan bawah adalah lapisan berpori. Membran PES/DMF memiliki struktur pori yang lebih besar dibandingkan membran PES/NMP. Koefisien permeabilitas kedua membran yang dihasilkan berada dalam jangkauan ultrafiltrasi. Koefisien permeabilitas (Lp) membran PES/DMF sebesar 35,769 L/m2.jam, nilai ini jauh lebih besar dibandingkan PES/NMP yaitu 15,364 L/m2.jam.bar. Molecular Weight Cut-Off (MWCO) dari membran PES/DMF yaitu 177 Kda sedangkan membran PES/NMP sebesar 186 Kda. Kinerja membran PES/DMF terhadap pemisahan larutan dekstran memberikan nilai fluks yang lebih tinggi daripada membran PES/NMP sedangkan rejeksi yang dihasilkan lebih rendah. Fluks tertinggi diperoleh pada TMP 2 bar sebesar 11,4 L/m2.jam untuk membran PES/DMF dan 10,2 L/m2.jam untuk membran PES/NMP.

Kata kunci:          kinerja membran, membran asimetris, Molecular Weight Cut-Off (MWCO), morfologi, permeabilitas


Keywords


Membran asimetrik; Morfologi; Permeabilitas ;Molecular Weight Cut-Off (MWCO); Kinerja Membran

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DOI: http://dx.doi.org/10.36974/jbi.v8i1.1617

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