Synthesis of MFI zeolite membranes for water desalination

Kazemimoghadam, Mansoor; Mohammadi, Toraj

doi:10.1016/j.desal.2006.04.063

Cited by 64 publications

(40 citation statements)

References 18 publications

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“…Synthetic zeolite materials are highly configurable through their chemistry and have been extensively studied for a variety of applications including catalysis, adsorption, sensing and separation [1][2][3][4][5][6][7][8][9][10]. Such materials are potential candidates for water treatment and desalination membranes as they possess the required small pore properties to capture organics and/or reject ions.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have explored the use of advanced zeolitic materials to capture micro-pollutants in water which can be highly selective and magnetically separable [1][2][3]. There has also been some work applying zeolite membranes in the application of desalination [4][5][6][7][8][9][10]. Lin et al [9] conducted a molecular dynamic simulation study on the diffusion of dissolved NaCl through a perfect (single crystal) pure-silica ZK-4 zeolite.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Designing hierarchical porous features of ZSM-5 zeolites via Si/Al ratio and their dynamic behavior in seawater ion complexes

Zhu

Doherty

et al. 2013

Microporous and Mesoporous Materials

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MFI-type zeolites were characterized using powder x-ray diffraction (XRD), and positron annihilation lifetime spectroscopy (PALS) to uncover the hierarchical porous * Corresponding author. Tel: +61 3 9919 7682; fax: +61 3 9919 7696. Email: mikel.duke@vu.edu.au (M. Duke). overall release of ions, principally Na + and K + , which were liberated mainly from the zeolite channels, yet these materials adsorbed Ca 2+ in the microporous grain boundaries and Mg 2+ in the mesoporous grain boundaries. Si/Al = 100 appeared to be a unique ratio, allowing the material to possess the same Na + adsorption features (and hydrophilicity) of high alumina materials, but ion interactions resembling high silica materials. MFI-type zeolite is therefore shown to be highly configurable using Si/Al ratio for a wide variety of applications in the presence of ions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Designing hierarchical porous features of ZSM-5 zeolites via Si/Al ratio and their dynamic behavior in seawater ion complexes

Zhu

Doherty

et al. 2013

Microporous and Mesoporous Materials

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“…Na + 0.716 nm, K + 0.662 nm, Ca 2+ 0.824 nm, Table 1) [16]. Following this computational simulation study, several research groups have explored the possibility of using MFI-type zeolite membranes for desalination [2,[6][7][8][9]. The MFI-type zeolite has orthorhombic crystal symmetry with nearly cylindrical, 10-member ring channels.…”

Section: Introductionmentioning

confidence: 99%

“…Single layers are a more simplistic approach but the material must possess the required pore size between ions and the water. There have been some studies to date applying different membrane materials such as zeolites [2,3,[6][7][8][9][10], and hybrid organically bridged silica [5] for membrane desalination. Zeolite materials are highly configurable through their chemistry and offer unique frameworks for a wide variety of applications including chemical sensing, water treatment and chemical reaction [2,3,[6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Desalination of seawater ion complexes by MFI-type zeolite membranes: Temperature and long term stability

Zhu

Zhou

Milne

et al. 2014

Journal of Membrane Science

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Desalination of seawater ion complexes by MFI-type zeolite membranes: temperature and long term stability, Journal of Membrane Science, http://dx.doi.org/10.1016/j.memsci. 2013.10.071 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 2 high rejection (>93%) for all major seawater ions including Na + (except for K + , 83%) at an applied pressure of 700 kPa and room temperature (22 °C), but showed a continuous decrease in ion rejection when increasing the temperature from 22 °C and 90 °C. Permeation flux of the zeolite membrane significantly increased with increasing in temperature. Upon closer observation of the major cations, size selective diffusion in the zeolite membrane was observed over the temperatures tested. Larger ions Ca 2+ and Mg 2+ were less responsive to temperature than smaller ions Na + and K + . No changes in membrane structure were observed by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) after 180 days seawater exposure. However, energy-dispersive X-ray spectroscopy (EDS) mapping on the surface of the membrane revealed a small quantity of tightly bound divalent cations present in the structure, which appear to have penetrated the zeolite, accelerated by temperature. They were suspected to have altered the permstructure, explaining why original high rejections at room temperature were not reversed after heat exposure. The work has shown that zeolite membranes can desalinate seawater, but other unusual effects such as ion selective diffusion as a function of temperature indicate a unique property for desalination membrane materials.

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“…It's found that the initial adsorption was slightly rapid within the first 100 min due to the adsorption of Ca +2 and total hardness onto the exterior surface. Then the ions enter into interior zeolite-4A (Kazemimoghadam and Mohammadi 2007). After that, the adsorption rate decreased substantially with time till equilibrium position.…”

Section: Contact Time Researchmentioning

confidence: 99%

Removing of Hardness Salts from Groundwater by Thermogenic Synthesis Zeolite

Gad¹,

Farrag²,

Moghny³

et al. 2016

JESES

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ABSTRACT:Calcium and magnesium hardness solids in groundwater are very common and caused major problems for drinking and household purposes. This study aims to synthesize zeolite-4A from kaolinite for removing the total hardness ions from Assiut Governorate groundwater wells in Egypt. The kaolin was hydrothermally calcinated through metakaolinization and zeolitization processes to produce crystalline zeolite-4A. The chemical composition and morphology ofcrystalline zeolite-4A was characterized by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Then the column experiments were conducted to study the performance of crystalline salt-4A as ion exchange and investigate their operation parameters and regeneration conditions. Thomas and Yoon-Nelson models were applied to predict the adsorption capacity and time required for 50% breakthrough curves. The effects of initial concentrations of 550 mg/l for total Ca +2 and Mg +2 hardness, feed flow rate of 10-30 ml/min, and height range of 1.0-4.0 cm on the breakthrough behavior of the adsorption system were studied. The obtained results indicated that the synthesized zeolite-4A can remove total hardness (Ca +2 + Mg +2) ions from groundwater to the permissible limit according to the standards drinking water law.

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Synthesis of MFI zeolite membranes for water desalination

Cited by 64 publications

References 18 publications

Designing hierarchical porous features of ZSM-5 zeolites via Si/Al ratio and their dynamic behavior in seawater ion complexes

Designing hierarchical porous features of ZSM-5 zeolites via Si/Al ratio and their dynamic behavior in seawater ion complexes

Desalination of seawater ion complexes by MFI-type zeolite membranes: Temperature and long term stability

Removing of Hardness Salts from Groundwater by Thermogenic Synthesis Zeolite

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