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Synthesis and performance evaluation of zeolitic imidazolate framework-8 membranes deposited onto alumina hollow fiber for desalination

Mahpoz, Nizar Mu’ammar and Abdullah, Norfazliana and Mohd. Pauzi, Mohamad Zahir and A. Rahman, Mukhlis and Abas, Khairul Hamimah and Abd. Aziz, Azian and Othman, Mohd. Hafiz Dzarfan and Jaafar, Juhana and Ismail, Ahmad Fauzi (2019) Synthesis and performance evaluation of zeolitic imidazolate framework-8 membranes deposited onto alumina hollow fiber for desalination. Korean Journal of Chemical Engineering, 36 (3). pp. 439-449. ISSN 0256-1115

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Official URL: http://dx.doi.org/10.1007/s11814-018-0214-6

Abstract

This work describes the development of zeolitic imidazolate framework-8 (ZIF-8) membranes on modified alumina hollow fiber for desalination by forward osmosis. Effects of different seeds (ZnO, NiO and PDA) and sodium formate on in-situ deposition of ZIF-8 were studied in relation to the membrane’s morphology and performance. XRD result shows that ZIF-8 was successfully synthesized in the presence of sodium formate. FESEM images showed PDA modified support was unsuccessful in producing well defined and dense ZIF-8 membrane layer even after another ZIF-8 re-deposition due to its minimal amount. The NiO modified support was also found unsuccessful, as ZIF-8 crystals were formed in clusters. On the contrary, dense ZIF-8 membrane was successfully prepared on ZnO modified support with SF-1 synthesis solution producing bigger ZIF-8 crystal and thinner ZIF-8 membrane than as of SF-2. Water flux performance in forward osmosis showed that NiO/ZIF-8, PDA/ZIF-8 and PDA/ZIF-8 (re-deposition) membranes gave negative water fluxes of -50 kg/m 2 ·h, -5.2 kg/m 2 ·h and -1.7 kg/m 2 ·h with reverse solutes of 42.66 mol/m 2 ·h, 27.42mol/m 2 ·h and 3.22 mol/m 2 ·h, respectively, indicating the solute from draw solution diffused into the feed solution. However, ZIF-8 membrane prepared using SF with molar ratio of 1, on the ZnO modified support had a water flux of 13.3 kg/m 2 ·h, reverse solute of 0.95 kg/m 2 ·h and salt rejection of 52.1%. When the SF ratio was increased to 2, the ZIF-8 membranes showed a water flux of 12.5 kg/m 2 ·h, reverse solute of 1.64 kg/m 2 ·h and salt rejection of 54.9%. The moderate salt rejection could be associated with defects in the ZIF-8 membranes due to poor grain boundaries.

Item Type:Article
Uncontrolled Keywords:forward osmosis, metal organic framework, zeolitic imidazolate framework membrane
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:88380
Deposited By: Yanti Mohd Shah
Deposited On:15 Dec 2020 08:02
Last Modified:15 Dec 2020 08:02

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