Çinko Ferrit Nanopartikül ile Modifiye Edilmiş PSf Kompozit Membranların Hazırlanması ve Performanslarının Belirlenmesi

Year 2021, Issue: 22, 159 - 166, 31.01.2021

Abdullah Oğuz Can Emine Özkan Ahmet Özgür Saf

https://doi.org/10.31590/ejosat.852822

Abstract

Bu çalışmada, hidrotermal sentez yöntemi ile çinko ferrit (ZnFe2O4) nanopartikül sentezlenerek XRD ve FTIR teknikleriyle karakterize edilmiştir. Boş PSf ve farklı kütle oranlarında çinko ferrit içeren nanofiltrasyon membranlar faz değişim metodu ile hazırlanmıştır. Hazırlanan membranlar FESEM ve AFM görüntülerinin incelenmesi, temas açısı, gözeneklilik ölçümleri, saf su akılarının belirlenmesi, kirlenme direnci ile tuz giderimi sonuçları ile morfoloji ve performans açısından karakterize edilmiştir. Çinko ferrit nanoparçacıklarının eklenmesi ile membranların gözenekliliği ve hidrofilikliğinde iyileşmeler gözlenmiş, bunun bir sonucu olarak saf su akısında önemli bir artış elde edilmiştir. Saf su akısı, PSf membran için 1.5 L/m2h olarak gerçekleşirken, %54.9 artışla %2.5 çinko ferrit içeren kompozit membran için 4.5 L/m2h olarak bulunmuştur. Membranların tuz giderme performansı 1000 ppm Na2SO4 çözeltisi kullanılarak incelenmiş ve en iyi performans %40.6 tuz giderimi ile %2.5 çinko ferrit içeren kompozit membranda elde edilmiştir. Ayrıca, membran uygulamalarında önemli bir problem olarak kabul edilen membran kirlenmesi BSA çözeltisi kullanılarak araştırılmıştır. BSA çözeltisi kullanılmadan önce ve sonraki saf su akılarının değişimi incelenmiştir. ZnFe2O4 katkılı membranların FRR değerleri, PSf membranın %56 olan FRR değerinden daha yüksek bulunmuştur. Bu, nanoparçacık eklenmesinin membranın kirlilik önleyici özelliğini önemli ölçüde iyileştirdiğini göstermektedir. Ayrıca, membranların kirlenme direncini daha detaylı incelemek için tersinir kirlenme oranı (Rr), tersinmez kirlenme oranı (Rir) ve toplam kirlenme (Rt) değerleri hesaplanmıştır. Ağırlıkça %2.5 çinko ferrit içeren membranın toplam kirlenme ve tersinmez kirlenme oranının PSf membrana kıyasla daha düşük olduğu bulunmuştur. Ayrıca, en yüksek tersinir kirlenme oranı elde edilmiştir. Sonuç olarak, PSf membrana çinko ferrit nanoparçacıkların katılması performansının iyileşmesine katkı sağladığını görülmüştür.

Keywords

Kompozit membran, Polisülfon, Saf su akısı, Kirlenme, Çinko ferrit

Preparation of PSf Composite Membranes Modified with Zinc Ferrite Nanoparticle and Determination of Their Performance

Abstract

In the study, zinc ferrite (ZnFe2O4) nanoparticles were synthesized by the hydrothermal synthesis method and characterized by FTIR and XRD techniques. Blank PSf and nanofiltration membranes containing different mass ratios of zinc ferrite were prepared by phase inversion process. The prepared membranes were characterized in terms of morphology and performance by examining FESEM and AFM images, contact angle, porosity measurements, determination of pure water fluxes, contamination resistance and desalination results. With the addition of zinc ferrite nanoparticles, improvements were observed in the porosity and hydrophilicity of the membranes, as a result of which a significant increase in pure water flux was obtained. While the pure water flux was realized as 1.5 L/m2h for PSf membrane, it was found as 4.5 L/m2h for the composite membrane containing 2.5% zinc ferrite with an increase of 54.9%. The desalination performance of the membranes was examined by using 1000 ppm Na2SO4 solution and the best performance was obtained on the composite membrane containing 0.1% zinc ferrite with 40.6% desalination. In addition, membrane fouling, which is considered to be an important problem in membrane applications, has been investigated using BSA solution. The variation of pure water fluxes before and after using BSA solution was investigated. The blended membranes with ZnFe2O4 exhibited higher FRR values than the 56% FRR value of the PSf membrane. This indicates that the addition of nanoparticles significantly improves the antifouling property of the membrane. In addition, reversible fouling ratio (Rr), irreversible fouling ratio (Rir) and total fouling (Rt) values were calculated to examine the fouling resistance of the membranes in more detail. It was found that the total fouling and irreversible fouling ratio of the membrane containing 2.5% zinc ferrite by weight were lower compared to the PSf membrane. In addition, the highest reversible contamination ratio was obtained. As a result, it has been seen that the addition of zinc ferrite nanoparticles to PSf membrane contributes to the improvement of its performance.

Keywords

Composite membrane, Polysulfone, , Pure water flux, Zinc ferrite

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