Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination

This study was aimed to develop zirconium (Zr)-based metal organic framework (MOF) ceramic membrane that can be used for forward osmosis (FO) desalination. As the first step, ceramic substrate surface was first modified with zirconium dioxide (ZrO2) using sol-gel Pechini’s method to provide active s...

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Main Author:	Yahaya, Nur Zhatul Shima
Format:	Thesis
Language:	English
Published:	2020
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/92075/1/NurZhatulShimaMSChE2020.pdf
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spelling	my-utm-ep.920752021-08-30T05:09:59Z Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination 2020 Yahaya, Nur Zhatul Shima TP Chemical technology This study was aimed to develop zirconium (Zr)-based metal organic framework (MOF) ceramic membrane that can be used for forward osmosis (FO) desalination. As the first step, ceramic substrate surface was first modified with zirconium dioxide (ZrO2) using sol-gel Pechini’s method to provide active seeds that can favour MOF nucleation. Using this modified substrate, a series of solvothermal synthesis conditions were tested to build the FO applicable membrane. In the unmodulated procedure, only sample synthesized at 220°C with 0.3 M and 16 h gave positive water flux. Field emission scanning electron microscopy (FESEM) and themogravimetric analysis (TGA) results have shown that the non-uniform coverage and defect frameworks of MIL-140B (Materials of Institute Lavoisier –MIL) on the substrate layer was the cause to this problem. Hence, to tune the defect, modulated synthesis was introduced. Increment in modulator amount by increasing precursor concentration from 0.58 M to 2.32 M had successfully lowered the percentage of defect framework from 26.03% to 16.87%. Despite this framework enhancement, FO test result of this sample still displayed worse performance than the previous synthesis due to its high tendency of agglomeration. Loosely joint particles that formed during agglomeration at high temperature synthesis were easily brushed off during FO test. Therefore, lower synthesis temperature of 120°C and longer synthesis time of 24 h was employed in the next procedure to allow slow nucleation process that can form better connected crystals. Instead of MIL-140B, UiO-66-NDC (University of Oslo – UiO) framework was found at 2? = 10.36° and the crystal shape appeared in octahedron. Even with this reformatted crystal shape, the FO performance result still could not be in positive value. Therefore, the UiO-66-NDC membrane active layer was polymerised with fluorinated polymer as the last resort. Integration between this polymer and UiO-66-NDC had successfully treated the membrane defects by building new bonds inside the framework as proven by FESEM, atomic force microscopy, xray diffraction, Fourier-transform infrared spectroscopy and TGA results. With better connected crystals, smoother deposition layer and perfect frameworks, FO performance of all UiO-66-NDC samples finally gave positive water flux results and the highest value was 16.189 L/m2.h. Its lowest reverse solute flux achieved was 0.003 L/m2.h with sodium chloride rejection of up to 80 % which is definitely better than the previous study. Therefore, polymer-synthesized UiO-66-NDC on ceramic hollow fibre can definitely serve as an excellent FO membrane option that can be used in the desalination process. 2020 Thesis http://eprints.utm.my/id/eprint/92075/ http://eprints.utm.my/id/eprint/92075/1/NurZhatulShimaMSChE2020.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:139322 masters Universiti Teknologi Malaysia, Faculty of Engineering - School of Chemical & Energy Engineering Faculty of Engineering - School of Chemical & Energy Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Yahaya, Nur Zhatul Shima Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination
description	This study was aimed to develop zirconium (Zr)-based metal organic framework (MOF) ceramic membrane that can be used for forward osmosis (FO) desalination. As the first step, ceramic substrate surface was first modified with zirconium dioxide (ZrO2) using sol-gel Pechini’s method to provide active seeds that can favour MOF nucleation. Using this modified substrate, a series of solvothermal synthesis conditions were tested to build the FO applicable membrane. In the unmodulated procedure, only sample synthesized at 220°C with 0.3 M and 16 h gave positive water flux. Field emission scanning electron microscopy (FESEM) and themogravimetric analysis (TGA) results have shown that the non-uniform coverage and defect frameworks of MIL-140B (Materials of Institute Lavoisier –MIL) on the substrate layer was the cause to this problem. Hence, to tune the defect, modulated synthesis was introduced. Increment in modulator amount by increasing precursor concentration from 0.58 M to 2.32 M had successfully lowered the percentage of defect framework from 26.03% to 16.87%. Despite this framework enhancement, FO test result of this sample still displayed worse performance than the previous synthesis due to its high tendency of agglomeration. Loosely joint particles that formed during agglomeration at high temperature synthesis were easily brushed off during FO test. Therefore, lower synthesis temperature of 120°C and longer synthesis time of 24 h was employed in the next procedure to allow slow nucleation process that can form better connected crystals. Instead of MIL-140B, UiO-66-NDC (University of Oslo – UiO) framework was found at 2? = 10.36° and the crystal shape appeared in octahedron. Even with this reformatted crystal shape, the FO performance result still could not be in positive value. Therefore, the UiO-66-NDC membrane active layer was polymerised with fluorinated polymer as the last resort. Integration between this polymer and UiO-66-NDC had successfully treated the membrane defects by building new bonds inside the framework as proven by FESEM, atomic force microscopy, xray diffraction, Fourier-transform infrared spectroscopy and TGA results. With better connected crystals, smoother deposition layer and perfect frameworks, FO performance of all UiO-66-NDC samples finally gave positive water flux results and the highest value was 16.189 L/m2.h. Its lowest reverse solute flux achieved was 0.003 L/m2.h with sodium chloride rejection of up to 80 % which is definitely better than the previous study. Therefore, polymer-synthesized UiO-66-NDC on ceramic hollow fibre can definitely serve as an excellent FO membrane option that can be used in the desalination process.
format	Thesis
qualification_level	Master's degree
author	Yahaya, Nur Zhatul Shima
author_facet	Yahaya, Nur Zhatul Shima
author_sort	Yahaya, Nur Zhatul Shima
title	Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination
title_short	Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination
title_full	Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination
title_fullStr	Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination
title_full_unstemmed	Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination
title_sort	deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination
granting_institution	Universiti Teknologi Malaysia, Faculty of Engineering - School of Chemical & Energy Engineering
granting_department	Faculty of Engineering - School of Chemical & Energy Engineering
publishDate	2020
url	http://eprints.utm.my/id/eprint/92075/1/NurZhatulShimaMSChE2020.pdf
_version_	1747818563745349632

Deposition of synthesized zirconium-based metal organic framework on ceramic hollow fibre for forward osmosis desalination

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