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PENGARUH PENAMBAHAN Fe3O4 TERHADAP KINERJA MEMBRAN NANOFILTRASI POLIVINILIDIN FLUORIDA UNTUK PEMISAHAN ION GARAM
Teknologi membran nanofiltrasi sebagai proses pre-treatment desalinasi menjadi salah satu solusi alternatif untuk mengatasi masalah ketersediaan air bersih melaui desalinasi air. Penelitian ini bertujuan untuk mengetahui karakteristik, uji kinerja, dan kondisi optimum sintesis membran nanokomposit PVDF/MWCNT/Fe3O4. Membran disintesis melalui metode inversi fasa dengan komposisi PVDF (18%), MWCNT (0.001%), Fe3O4 NPs (0.001-0.005%). Karakteristik membran nanokomposit PVDF/MWCNT/Fe3O4 dianalisis menggunakan teknik dan instrumentasi antara lain, FTIR, XRD, SEM-EDX, sifat mekanik, hidrofilisitas, porositas, dan point zero of charge (PZC). Selain itu, kinerja membran diuji dengan sistem filtrasi dead-end (DE) dan cross-flow (CF) melalui permeabilitas, permselektivitas, MWCO, dan antifouling. Keberhasilan sintesis membran ditunjukkan dengan adanya interaksi khas pada spektrum FTIR 532 cm-1 (Fe-O) dan difraktogram XRD pada puncak 2θ 20.16o [110], 26.39o [002], dan 43.02o [400] serta peningkatan %kristalinitas dari 33.10% menjadi 51.71%. Fotograf SEM menunjukkan bahwa penambahan MWCNT dan Fe3O4 NPs menyebabkan perubahan struktur morfologi dan ukuran pori dari 130 nm menjadi 100 nm. Penambahan Fe3O4 NPs juga meningkatkan hidrofilisitas dari 74.58o menjadi 59.60o, porositas dari 49.31% menjadi 70.49%, dan range nilai PZC berkisar antara 6.62-7.51. uji kinerja membran dengan sistem DE dan CF menunjukkan bahwa pnambahan Fe3O4 NPs meningkatkan permeabilitas air menjadi 35,16 dan 28,80 L/m²·h·bar, selektivitas ion garam NaCl (65,62% dan 79,86%), CaCl₂ (70,03% dan 73,69%), dan FeCl₃ (83,06% dan 88,68%) serta meningkatkan flux recovery ratio (FRR) dari 66.25% menjadi 87.46%. Hasil uji MWCO menggunakan zat warna (RB, MO, dan MB) menunjukkan bahwa membran nanokomposit PVDF/MWCNT/Fe3O4 memiliki nilai MWCO sekitar 320 Da yang mengindikasikan membran termasuk dalam kategori tight nanofiltrasi. Nanofiltration membrane technology as a process pre-treatment desalination is an alternative solution to overcome the problem of clean water availability through water desalination. This research aims to determine the characteristics, performance tests, and optimum conditions for the synthesis of PVDF/MWCNT/Fe3O4 nanocomposite membranes. The membrane was synthesized via the phase inversion method with the composition PVDF (18%), MWCNT (0.001%), Fe3O4 NPs (0.001-0.004%). The characteristics of PVDF/MWCNT/Fe3O4 nanocomposite membranes were analyzed using techniques and instrumentation including, FTIR, XRD, SEM-EDX, mechanical properties, hydrophilicity, porosity, and point zero of charge (PZC). Additionally, the membrane performance was tested with the filtration system dead-end (DE) then cross-flow (CF) through permeability, permselectivity, MWCO, and antifouling. The success of membrane synthesis is demonstrated by the presence of typical interactions FTIR spectrum in the 532 cm-1 (Fe-O) and XRD diffractogram at 2θ peak 20.16o [110], 26.39o [002], and 43.02o [400] as well as an increase in %crystallinity from 33.10% to 51.71%. SEM photography shows that the addition of MWCNT and Fe3O4 NPs caused changes in morphological structure and pore size from 130 nm to 100 nm. The addition of Fe3O4 NPs also increased the hydrophilicity of 74.58o to 59.60o, porosity from 49.31% to 70.49%, and the PZC value range is between 6.62-7.51. Membrane performance tests with DE and CF systems showed that the addition of Fe3O4 NPs increased water permeability to 35.16 and 28.80 L/m²·h·bar, NaCl salt ion selectivity (65.62% and 79.86%), CaCl₂ (70.03% and 73.69%), and FeCl₃ (83.06% and 88.68%) and increasing the flux recovery ratio (FRR) from 66.25% to 87.46%. MWCO test results using dyes (RB, MO, and MB) show that the PVDF/MWCNT/Fe3O4 nanocomposite membrane has an MWCO value of around 320 Da which indicates the membrane is included in the category tight nanofiltration.
KODEPRODI47102#Kimia_S2, Universitas Pendidikan Indonesia
PENGARUH PENAMBAHAN Fe3O4 TERHADAP KINERJA MEMBRAN NANOFILTRASI POLIVINILIDIN FLUORIDA UNTUK PEMISAHAN ION GARAM (Text)
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QD Chemistry