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Zeolite Membrane

Xiaobin Tang, Xiaoxiang Cheng, Xuewu Zhu, Binghan Xie, Yuanqing Guo, Jinlong Wang, An Ding, Guibai Li, Heng Liang
Ultra-low pressure gravity-driven membrane (GDM) filtration has been proposed as a cost-efficiency alternative for the decentralized drinking water supply in terms of its simple operation and low energy consumptions, whereas its undesirable removals of dissolved organic compounds (DOC) and relatively low flux impede its widespread application. In order to improve its filtration performance, filter media (granular activated carbon (GAC), zeolite and bio-ceramsite) was directly coated on the membrane surface to engineer an integrated GDM system...
August 4, 2018: Chemosphere
Hilal Daglar, Seda Keskin
It has become a significant challenge to select the best metal-organic frameworks (MOFs) for membrane-based gas separations because the number of synthesized MOFs is growing exceptionally fast. In this work, we used high-throughput computational screening to identify the top MOF membranes for flue gas separation. Grand canonical Monte Carlo and molecular dynamics simulations were performed to assess adsorption and diffusion properties of CO2 and N2 in 3806 different MOFs. Using these data, selectivities and permeabilities of MOF membranes were predicted and compared with those of conventional membranes, polymers, and zeolites...
August 2, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Mitali Sen, Kausik Dana, Nandini Das
In this work, sodium aluminosilicate zeolite powder and membranes were synthesized by ultrasonic irradiation at room temperature using montmorillonite clay as precursor material. For comparison, same zeolite powder and membranes were synthesized at 100 °C also. The synthesized zeolites were characterized by X-ray diffraction (XRD), infrared (IR) spectral analysis, and field-emission scanning electron microscopy (FESEM). XRD and IR results showed that phase pure mainly LTA phase was formed after 15 days of aging at room temperature...
November 2018: Ultrasonics Sonochemistry
Mahdi Ahmadi, Saravanan Janakiram, Zhongde Dai, Luca Ansaloni, Liyuan Deng
Application of conventional polymeric membranes in CO₂ separation processes are limited by the existing trade-off between permeability and selectivity represented by the renowned upper bound. Addition of porous nanofillers in polymeric membranes is a promising approach to transcend the upper bound, owing to their superior separation capabilities. Porous nanofillers entice increased attention over nonporous counterparts due to their inherent CO₂ uptake capacities and secondary transport pathways when added to polymer matrices...
July 28, 2018: Membranes
Mohd Ridhwan Adam, Norliyana Mohd Salleh, Mohd Hafiz Dzarfan Othman, Takeshi Matsuura, Mohd Hafizi Ali, Mohd Hafiz Puteh, A F Ismail, Mukhlis A Rahman, Juhana Jaafar
Adsorption is one of the most efficient ways to remove heavy metal from wastewater. In this study, the adsorptive removal of hexavalent chromium, Cr (VI) from aqueous solution was investigated using natural zeolite, clinoptilolite, in the form of hollow fibre ceramic membrane (HFCM). The HFCM sample was prepared using phase inversion-based extrusion technique and followed by sintering process at different sintering temperatures in the range of 900-1050 °C. The fabricated HFCM was characterised using scanning electron microscopy (SEM), contact angle, water permeability, and mechanical strength for all HFCMs sintered at different temperatures...
July 23, 2018: Journal of Environmental Management
Donglong Fu, Joel Schmidt, Paul Pletcher, Pelin Karakilic, Xinwei Ye, Carolien Vis, Pieter Bruijnincx, Matthias Filez, Laurens Mandemaker, Louis Winnubst, Bert Marc Weckhuysen
Facile fabrication of well-intergrown, oriented zeolite membranes with tunable chemical properties on commercially proven substrates is crucial to broadening their applications for separation and catalysis. Herein, we demonstrate that the rationally determined electrostatic adsorption can enable the direct attachment of a b-oriented silicalite-1 monolayer on a commercial porous ceramic substrate. Homoepitaxially oriented, well-intergrown zeolite ZSM-5 membranes with a tunable composition of Si/Al= 25-∞ were obtained by secondary growth of the monolayer...
July 24, 2018: Angewandte Chemie
Akshay Modi, Surendra Kumar Verma, Jayesh Bellare
The hydrophobic nature of zeolitic imidazole framework-8 (ZIF-8) nanoparticles restricts their use as additives in hollow fiber membranes (HFMs) for biomedical applications. In this study, hydrophilic ZIF-8 decorated graphene oxide nanosheets (ZGs) were synthesized and used as additives (0-1 wt%) in polyethersulfone (P) HFMs with the aim of improving the biocompatibility and separation performance so as to make the ZGP HFMs suitable for bioartificial liver (BAL) application. Elemental mapping and Fourier transform infrared studies confirmed the efficacious incorporation of ZG nanohybrids in the ZGP HFMs, which resulted in their improved hydrophilicity...
October 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Li Liang, Meihua Zhu, Le Chen, Caijun Zhong, Yiming Yang, Ting Wu, Heli Wang, Izumi Kumakiri, Xiangshu Chen, Hidetoshi Kita
Continuous and high silica SSZ-13 zeolite membranes were prepared on porous mullite supports from high SiO₂/Al₂O₃ ratio or aluminum-free precursor synthesis gel. Single gas permeance (CO₂ and CH₄) of the high silica SSZ-13 zeolite membrane was decreased with the SiO₂/Al₂O₃ ratio in the precursor synthesis gel, while the ideal CO₂/CH₄ selectivity of the membrane was gradually increased. Moreover, effects of synthesis conditions (such as H₂O/SiO₂ and RNOH/SiO₂ ratios of precursor synthesis gel, crystallization time) on the single gas permeance performance of high silica SSZ-13 zeolite membranes were studied in detail...
July 13, 2018: Membranes
Cigdem Altintas, Gokay Avci, Hilal Daglar, Ezgi Gulcay, Ilknur Erucar, Seda Keskin
Design of new membranes having high H2 /CH4 selectivity and high H2 permeability is strongly desired to reduce the energy demand for H2 production. Metal organic frameworks (MOFs) offer a great promise for membrane-based gas separations due to their tunable physical and chemical properties. We performed a high-throughput computational screening study to examine membrane-based H2 /CH4 separation potentials of 4240 MOFs. Grand canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations were used to compute adsorption and diffusion of H2 and CH4 in MOFs...
April 14, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
Serguei D Mikhailenko, Marco Antônio Siqueira Rodrigues, Fabricio Celso, Franciélli Muller, Carlos Arthur Ferreira, Serge Kaliaguine
Doped polyaniline (PANI) is well known as an electronic (polaronic) conductor and mostly is used as semiconductor in various applications. However in the literature there are examples of employment of acid doped form of PANI as electrolytic filler in proton exchange membranes. In order to distinguish between two type of conduction in the present study powdered samples of polyaniline, either in form of emeraldine base (PANI-EB) or doped with camphorsulphonic acid (PANI-CSA), were investigated using impedance spectroscopy both in dry state and in contact with liquid water...
July 10, 2018: Journal of Physical Chemistry. B
Daniel Salazar-Beltran, Carlos Palomino Cabello, Jorge L Guzman-Mar, Laura Hinojosa-Reyes, Gemma Turnes Palomino, Fernando Maya Alejandro
We report the preparation of hierarchical porous carbon sponges (HCS) from metal oxide nanoparticle@metal-organic frameworks. ZnO nanoparticles are partially converted to zeolitic imidazolate framework-8 (ZIF-8) crystals in presence of n-butylamine, obtaining ZnO@ZIF-8 porous hybrids. After direct carbonization, followed by ZnO acidic etching, ZnO@ZIF-8 crystals were converted to submicrometric HCS. Due to the high surface area and accessible porosity combining micro- and mesoporosity of HCS, their application for the extraction of water pollutants was studied preparing HCS/polymer membranes, showing a high efficiency for the fast (650 L m-2 h-1) removal of plastic degradation by-products (DBP, dibutyl phthalate...
June 26, 2018: Chemistry: a European Journal
Ting Li, Weiming Zhang, Shu Zhai, Guandao Gao, Jie Ding, Wenbin Zhang, Yang Liu, Xin Zhao, Bingcai Pan, Lu Lv
Enhanced removal of trace toxic metals (ppm level) from high-salinity wastewater is crucial to ensure water safety but still a challenging task. In this study, we fabricated a new hybrid ultrafiltration membrane (PAA/ZIF-8/PVDF) by immobilizing zeolitic imidazolate framework-8 (ZIF-8) particles onto the surface of trimesoyl chloride (TMC)-modified polyvinylidene fluoride (PVDF) membrane under protection of polyacrylic acid (PAA) layer. The resultant PAA/ZIF-8/PVDF membrane exhibited relatively high water flux of 460 L·m-2  h-1 and outstanding nickel ion (Ni(II)) capacity (219...
June 15, 2018: Water Research
Clara Casado-Coterillo, Ana Fernández-Barquín, Susana Valencia, Ángel Irabien
In the present work, the effect of zeolite type and topology on CO₂ and N₂ permeability using zeolites of different topology (CHA, RHO, and LTA) in the same Si/Al = 5, embedded in poly(trimethylsilyl-1-propyne) (PTMSP) is evaluated with temperature. Several models are compared on the prediction of CO₂/N₂ separation performance and then the modified Maxwell models are selected. The CO₂ and N₂ permeabilities through these membranes are predicted with an average absolute relative error (AARE) lower than 0...
June 16, 2018: Membranes
Roberto Castro-Muñoz, Vlastimil Fíla
Membranes, as perm-selective barriers, have been widely applied for gas separation applications. Since some time ago, pure polymers have been used mainly for the preparation of membranes, considering different kinds of polymers for such preparation. At this point, polyimides (e.g., Matrimid® 5218) are probably one of the most considered polymers for this purpose. However, the limitation on the performance relationship of polymeric membranes has promoted their enhancement through the incorporation of different inorganic materials (e...
June 14, 2018: Membranes
Yanni Liu, Zhi Wang, Mengqi Shi, Nan Li, Song Zhao, Jixiao Wang
A carbonic anhydrase inspired material was developed by incorporating Zn(ii) ion exchanged zeolite β into poly(N-vinylimidazole) solution. The hydrophobic zeolite channels were designed to imitate the function of the hydrophobic pocket in carbonic anhydrase. The composite membrane prepared by casting the material on a polysulfone ultrafiltration membrane showed a high CO2 permeance of 4620 GPU with a high CO2/N2 selectivity of 224.
June 26, 2018: Chemical Communications: Chem Comm
Shmuel Gonen, Lior Elbaz
In this article, we collected the most significant and recent data in brief in the field of metal organic frameworks oxygen reduction reaction catalysts, obtained from some of the most recent research papers in the field. We present lists of materials and their key parameters that are relevant to the cathode catalysts in polymer electrolyte membrane fuel cells. All the materials listed in this paper are composed of metal organic frameworks, zeolitic imidazolate frameworks, or their derivatives. These are divided into two main groups: pristine MOFs and MOF-derived materials...
August 2018: Data in Brief
Mei-Zhen Zou, Wen-Long Liu, Chu-Xin Li, Di-Wei Zheng, Jin-Yue Zeng, Fan Gao, Jing-Jie Ye, Xian-Zheng Zhang
Hypoxia is reported to participate in tumor progression, promote drug resistance, and immune escape within tumor microenvironment, and thus impair therapeutic effects including the chemotherapy and advanced immunotherapy. Here, a multifunctional biomimetic core-shell nanoplatform is reported for improving synergetic chemotherapy and immunotherapy. Based on the properties including good biodegradability and functionalities, the pH-sensitive zeolitic imidazolate framework 8 embedded with catalase and doxorubicin constructs the core and serves as an oxygen generator and drug reservoir...
July 2018: Small
Hongyu Yang, Zhenghua Tang, Kai Wang, Wen Wu, Yinghuan Chen, Zhaoqing Ding, Zhen Liu, Shaowei Chen
Developing efficient bi-functional electrocatalysts for both oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is crucial for producing hydrogen and utilizing hydrogen effectively to promote electrochemical energy storage in proton membrane exchange fuel cells (PEMFCs). Herein, we report Co@Pd core-shell nanoparticles encapsulated in porous carbon derived from zeolitic imidazolate framework 67 (ZIF-67) for both ORR and HER. The controlled pyrolysis of ZIF-67 can lead to the formation of Co nanoparticles encapsulated in nitrogen-doped porous carbon (Co NC), which subsequently underwent galvanic replacement with Na2 PdCl4 to form Co@Pd core-shell nanoparticles embedded in nitrogen-doped porous carbon (Co@Pd NC)...
May 21, 2018: Journal of Colloid and Interface Science
Javier Sánchez-Laínez, Beatriz Zornoza, Angelica F Orsi, Magdalena M Łozińska, Daniel M Dawson, Sharon E Ashbrook, Stephen M Francis, Paul A Wright, Virginie Benoit, Philip L Llewellyn, Carlos Téllez, Joaquín Coronas
The present work shows the synthesis of nano-sized hybrid zeolitic imidazolate frameworks (ZIFs) with the rho topology based on a mixture of the linkers benzimidazole (bIm) and 4-methyl-5-imidazolecarboxaldehyde (4-m-5-ica). The hybrid ZIF was obtained by post-synthetic modification of ZIF-93 in a bIm solution. The use of different solvents, MeOH and N,N-dimethylacetamide (DMAc), and reaction times led to differences in the quantity of bIm incorporated to the framework, from 7.4 to 23 % according to solution-state NMR spectroscopy...
May 25, 2018: Chemistry: a European Journal
Mohamad Sukri Mohamad Yusof, Mohd Hafiz Dzarfan Othman, Azeman Mustafa, Mukhlis Abdul Rahman, Juhana Jaafar, Ahmad Fauzi Ismail
Palm oil fuel ash (POFA) is an agricultural waste which was employed in this study to produce novel adsorptive ceramic hollow fibre membranes. The membranes were fabricated using phase inversion-based extrusion technique and sintered at 1150 °C. The membranes were then evaluated on their ability to adsorb cadmium (Cd(II)). These membranes were characterised using (nitrogen) N2 adsorption-desorption analysis, field emission scanning electron microscopy-energy-dispersive X-ray spectroscopy (FESEM-EDX) mapping, X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analyses while adsorptivity activity was examined by batch adsorption studies...
May 21, 2018: Environmental Science and Pollution Research International
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