FABRICATION OF ELECTROSPUN POLYACRYLONITRILE (PAN)/NYLON-6 NANOFIBER MEMBRANE AND ITS FOULING MECHANISM ON ASIAN PEAR (PYRUS PYRIFOLIA) JUICE FILTRATION
Nanofibers membrane is one of the excellent filtration media for pear juice clarification. Electrospinning technique is one of the techniques used in the synthesis of nanofibers membrane. Important parameters regarding a membrane are the efficiency and selectivity. One way to improve the selecti...
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Format: | Theses |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/20869 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | Nanofibers membrane is one of the excellent filtration media for pear juice clarification. Electrospinning technique is one of the techniques used in the synthesis of nanofibers membrane. Important parameters regarding a membrane are the efficiency and selectivity. One way to improve the selectivity of the membrane is to make the bilayer structure of electrospun PAN/nylon-6 nanofiber <br />
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membrane. In this research, it has been successfully manufactured nanofibers membrane as filtration media for pear juice there are PAN fiber membranes at the top and the nylon-6 nanofibers membrane on the bottom. Fabrication of PAN fiber is only made at a concentration of 9% (w/w) with a certain thickness, and nylon-6 nanofibers membranes were done by varying the solution concentration to produce different fiber diameters. Morphology of PAN fibers and nylon-6 nanofibers were cylindrical, smooth without the presence of beads with a uniform fiber category. The average fiber diameters of PAN fiber is (570±136) nm and for nylon-6 nanofibers with solution concentration of 29, 26, 23, 20, and 17% (w/w) were membrane A (484±142) nm, membrane B (392±57) nm, membrane C (225±49) nm, membrane D (92±17) nm, and membrane E (66±20) nm respectively, with the same membrane thickness of (151±1) μm. In this study, two basic things to do are to measure the efficiency of the <br />
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electrospun PAN/nylon-6 nanofiber membrane as a filtration media for pear juice and identification of membrane fouling mechanism. Measurement of membrane efficiency was analyzed by two parameters, namely the selectivity of the <br />
<br />
membrane towards turbidity and total phenol content also flux membranes. It has been found that for membranes with the same thickness, the highest reduction of turbidity and total phenol were given by the membrane E with the smallest fiber diameter (66±20) nm at a nylon-6 concentration of 17% (w/w) which is 99.57% and 32.35%. Furthermore, it has the lowest value of flux during the filtration process of pear juice with initial and final fluxes of (1443.584±23) and (63.703±2.3) L/m2.hours, respectively. Moreover, for the highest flux was given by the membrane A with the largest fiber diameter (484±142) nm at a nylon-6 concentration of 29% (w/w) with initial and final fluxes of (5080.493±65) and (99.038 ±0.12) L/m2.hours, respectively, but has the lowest reduction of turbidity and total phenol which is 98.87% and 13.87%. Identification of membrane fouling mechanism on filtration process for pear juice is by assuming fouling that occurs is a filtration cake. This filtration mechanism can be determined by calculating the cake resistance in the membrane. It has been found that the highest cake resistance from membrane E, membrane D, membrane C, membrane B, and membrane A, were 5.178×1017, 4.459×1017, 3.789×1017, 2.980×1017, and 2.142×1017 m/kg, respectively. So, it can be seen that the small diameter fiber with a low porosity level and small pore size has a high selectivity but has a low flux value. While for the large fiber diameter with high porosity level and large pore size has a high flux but low selectivity. Therefore, the electrospun PAN/Nylon-6 nanofiber membrane is potential as filtration media for pear juice because it can reduce the turbidity with high reduction rate which is > 90% but a low total phenol reduction of < 35% compared with the nylon-6 nanofiber membranes as reported by Fuenmayor (2014) and PAN nanofiber membranes by Sawitri (2016). |
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