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Zeolite Membrane

Zhe Zhai, Na Zhao, Wenjing Dong, Peng Li, Haixiang Sun, Qingshan Jason Niu
Zeolite imidazolate framework-8 (ZIF-8) has emerged as an excellent candidate for the preparation of thin-film nanocomposite (TFN) membrane. Nevertheless, it still remains a great challenge to effectively incorporate ZIF-8 into the resulting TFN membrane feasible for the facile application. Herein, we propose an in situ strategy to fabricate ZIF-8 nanocrystal hybrid reverse osmosis membrane induced by the ultrafast surface modification of Noria-polyethyleneimine (PEI) co-deposition. By this method, ZIF-8 nanocubes with monodispersity was firstly formed on modified support through the step-by-step deposition of precursor solutions...
March 14, 2019: ACS Applied Materials & Interfaces
Manjunath R Venkatesh, Sumit Sachdeva, Brahim El Mansouri, Jia Wei, Andre Bossche, Duco Bosma, Louis C P M de Smet, Ernst J R Sudhölter, Guo Qi Zhang
Capacitors made of interdigitated electrodes (IDEs) as a transducer platform for the sensing of volatile organic compounds (VOCs) have advantages due to their lower power operation and fabrication using standard micro-fabrication techniques. Integrating a micro-electromechanical system (MEMS), such as a microhotplate with IDE capacitor, further allows study of the temperature- dependent sensing response of VOCs. In this paper, the design, fabrication, and characterization of a low-power MEMS microhotplate with IDE capacitor to study the temperature-dependent sensing response to methanol using Zeolitic imidazolate framework (ZIF-8), a class of metal-organic framework (MOF), is presented...
February 20, 2019: Sensors
Ali Khan Shahbaz, Pia Muhammad Adnan Ramzani, Rashid Saeed, Veysel Turan, Muhammad Iqbal, Karolina Lewińska, Farhat Abbas, Muhammad Saqib, Hafiz Muhammad Tauqeer, Mutahar Iqbal, Maryam Fatima, Mahmood-Ur Rahman
Since Ni-rich soils are a threat to the environment, growing edible crops on Ni-rich soils can pose a serious risk to human, animal, plant and ecosystem health and, hence, is considered as a challenging task for the researchers. Contrarily, limiting the bioavailability of Ni in such soils upon the addition of suitable amendments cum foliar spray of proteinogenic amino acids having an objective to alleviate stress to crop plants can considerably reduce the environmental risk. In this pot trail, we substantiate the effects of biochar (BR) and zeolite (ZL) addition in the soil along with proline (PN) spray on the resistance, and stress responses of wheat against Ni as well as on Ni translocation and accumulation in wheat plants grown on a Ni-rich soil contaminated by electroplating effluent...
February 14, 2019: Ecotoxicology and Environmental Safety
Yang Han, Zhien Zhang
To mitigate carbon emission from the combustion of fossil fuels, membrane is advantageous due to the fact that membrane is a thin interphase acting as a selective barrier separating two phases. This thinness, typically in the range of 100 nm to a few micrometers, provides an almost natural platform to implement functional nanostructures. In this review, the recent progress in nanostructured membrane materials for CO₂ capture will be discussed, including applications in flue gas decarbonizing (CO₂/N₂ separation) and syngas purification (CO₂/H₂ separation)...
June 1, 2019: Journal of Nanoscience and Nanotechnology
Xiaofei Lu, Yanwei Yang, Junjia Zhang, Yushan Yan, Zhengbao Wang
Up to date, zeolite films have been mainly fabricated by in situ crystallization, secondary growth in a solution/hydrogel, or occasionally by vapor phase transformation of dry gel. Here we demonstrate for the first time a solvent-free secondary growth method for b-oriented silica MFI zeolite films using the synthetic powder from ground anhydrous raw solids in the presence of NH4 F. Typically, precisely b-oriented MFI zeolite films are synthesized from seed layers of highly b-oriented MFI zeolite crystals in the synthetic powder of 1SiO2 :0...
February 20, 2019: Journal of the American Chemical Society
Zhipeng Liao, Xiaofeng Fang, Jia Xie, Qin Li, Dapeng Wang, Xiuyun Sun, Lianjun Wang, Jiansheng Li
The performance of thin film nanocomposite (TFN) membrane is significantly determined by the inherent structure and composition of the incorporated nanofillers. In this work, hydrophilic hollow nanocubes (HHNs) derived from zeolitic imidazolate framework 8 (ZIF-8) were incorporated into the polyamide layer via interfacial polymerization approach. The HHNs with abundant hydroxyl groups on surface were obtained by etching solid ZIF-8 using tannic acid (TA). Benefiting from the hydrophilicity, hollow structure and negative charge of HHNs, the outstanding nanofiltration performance of the composite membrane was achieved...
January 14, 2019: ACS Applied Materials & Interfaces
Hong Cheng, Xue-Yan Jiang, Rong-Rong Zheng, Sheng-Jia Zuo, Lin-Ping Zhao, Gui-Ling Fan, Bo-Ru Xie, Xi-Yong Yu, Shi-Ying Li, Xian-Zheng Zhang
Targeted drug delivery with precisely controlled drug release and activation is highly demanding and challenging for tumor precision therapy. Herein, a biomimetic cascade nanoreactor (designated as Mem@GOx@ZIF-8@BDOX) is constructed for tumor targeted starvation therapy-amplified chemotherapy by assembling tumor cell membrane cloak and glucose oxidase (GOx) onto zeolitic imidazolate framework (ZIF-8) with the loading prodrug of hydrogen peroxide (H2 O2 )-sensitive BDOX. Biomimetic membrane camouflage affords superior immune evasion and homotypic binding capacities, which significantly enhance the tumor preferential accumulation and uptake for targeted drug delivery...
January 3, 2019: Biomaterials
Motomu Sakai, Yasuhito Sasaki, Taisuke Tomono, Masahiro Seshimo, Masahiko Matsukata
Propylene/propane and ethylene/ethane separation were examined with Ag-exchanged X-type zeolite membrane (Ag-X membrane). Na-X membrane was prepared on a porous tubular α-alumina support by a secondary growth method. The resulting Na-X membrane was ion-exchanged by using AgNO3 aq. Olefin selectivities in both mixtures were markedly improved after the ion exchange from Na to Ag cation. Ag-X membrane exhibited the maximum propylene selectivity of 55.4 with the permeance of 4.13 × 10-8 mol m-2 s-1 Pa-1 at 353 K for a propylene/propane (50:50) mixture...
January 7, 2019: ACS Applied Materials & Interfaces
Minseong Lee, Sungwon Hong, Dongjae Kim, Eunjoo Kim, Kyunghwan Lim, Jae Chil Jung, Dr Hannes Richter, Jong-Ho Moon, Nakwon Choi, Jaewook Nam, Jungkyu Choi
Chabazite (CHA) type zeolites are promising for the separation of CO2 from larger molecules, such as N2 (relevant to post-combustion carbon capture) and CH4 (relevant to natural gas/biogas upgrading). In particular, the pore size of CHA zeolites (0.37 × 0.42 nm2) can recognize slight molecular size differences between CO2 (0.33 nm) and the larger N2 (0.364 nm) or CH4 (0.38 nm) molecules, thus allowing separation in favor of CO2 through CHA membranes. Furthermore, the siliceous constituents in the CHA zeolite can reduce the adsorption capacity toward the smaller H2O molecule (0...
January 7, 2019: ACS Applied Materials & Interfaces
Shiying Li, Junfen Li, Mei Dong, Subing Fan, Tiansheng Zhao, Jianguo Wang, Weibin Fan
Aluminosilicate zeolites with controllable morphology have attracted considerable attention due to their potential applications in catalysis, adsorption, and separation technologies, as well as the biomedical field. However, the rational design and preparation of zeolites with the required morphology have not been achieved because the zeolite crystallization mechanism has not been fully understood, and therefore, the nucleation and crystal growth processes cannot be oriented. This paper reviews the progresses achieved in zeolite morphology control...
January 2, 2019: Chemical Society Reviews
Ming Qiu, Chunju He
A novel thin film nanocomposite (TFN) forward osmosis (FO) membrane with a positively charged and nano-functional selective layer has been developed for effective heavy metal ions removal. The selective layer is constructed by penetrating the polydopamine modified zeolitic imidazolate framework (ZIF-8@PDA) in the poly(ethyleneimine)/1,3,5-benzenetricarboxylic acid chloride (PEI/TMC) crosslinked matrix. Compared with the pristine thin film composite (TFC) membrane, the thin film nanocomposite membrane (0.05 wt % nanofillers loading) exhibits a higher water flux (20...
December 26, 2018: Journal of Hazardous Materials
Arturo Barjola, Jorge Escorihuela, Andreu Andrio, Enrique Giménez, Vicente Compañ
The zeolitic imidazolate frameworks (ZIFs) ZIF-8, ZIF-67, and a Zn/Co bimetallic mixture (ZMix) were synthesized and used as fillers in the preparation of composite sulfonated poly(ether ether ketone) (SPEEK) membranes. The presence of the ZIFs in the polymeric matrix enhanced proton transport relative to that observed for SPEEK or ZIFs alone. The real and imaginary parts of the complex conductivity were obtained by electrochemical impedance spectroscopy (EIS), and the temperature and frequency dependence of the real part of the conductivity were analyzed...
December 13, 2018: Nanomaterials
Derrick S Dlamini, Bhekie B Mamba, Jianxin Li
This review looks into the efforts made towards commercializing nano-enable flat sheet membranes as well as the challenges that need to be overcome. There is a question mark on the argument that the nano-pores of the fillers play a significant role in the performance of the membrane. Non porous nanomaterials have been reported to cause in increase in water flux, yet there are still articles that credit the nano-pores of the nanomaterials for improved membrane performance. There are two points that are important to highlight: (1) the nanoparticles, e...
November 29, 2018: Science of the Total Environment
Palmira Tavolaro, Silvia Catalano, Adalgisa Tavolaro
This paper deals with the design and manufacture of pure and hybrid synthetic (Mixed Matrix Membranes, MMMs) zeolite scaffolds (containing various amount of zeolite crystals dispersed in a polymeric matrix) to obtain new biomaterials. These scaffolds can potentially be used in the field of translational medicine to obtain innovative results to address tumorigenesis mechanisms with the promotion of an effort to deal with technical methods and information. Since olive oil has beneficial effects in healthy human cells and slows down and/or inhibits cell growth, the aim of this work was to monitor the protective and beneficial antitumor effects of olive oil in a new solid formulation (Spread Bio-Oil) on cancer cell cultured on zeolite scaffolds...
December 4, 2018: Food and Chemical Toxicology
Zishu Cao, Shixuan Zeng, Zhi Xu, Antonios Arvanitis, Shaowei Yang, Xuehong Gu, Junhang Dong
The tremendous potential of zeolite membranes for efficient molecular separation via size-exclusion effects is highly desired by the energy and chemical industries, but its practical realization has been hindered by nonselective permeation through intercrystalline spaces and high resistance to intracrystalline diffusion in the conventional zeolite membranes of randomly oriented polycrystalline structures. Here, we report the synthesis of ZSM-5 zeolite nanosheets with very large aspect ratios and nanometer-scale thickness in the preferred straight channel direction...
November 2018: Science Advances
Qisong Xu, Kang Zhang, Jianwen Jiang
The need to understand and describe permeation through membranes has driven the development of many well-established transport models. The modelling parameters such as solubility, diffusivity and permeability represent the intrinsic nature of molecular interactions between membrane and permeants. In this study, we report a simulation and analysis methodology for liquid permeation. Based on a single simulation of liquid sorption process into a membrane, the solubility and diffusivity are estimated simultaneously, then the permeability is predicted by the solution-diffusion model...
November 21, 2018: Journal of Physical Chemistry. B
Zahir Razzaz, Denis Rodrigue
In this work, hollow fiber porous nanocomposite membranes were successfully prepared by the incorporation of a porous nanoparticle (zeolite 5A) into a blend of linear low-density polyethylene (LLDPE)/low-density polyethylene (LDPE) combined with azodicarbonamide as a chemical blowing agent (CBA). Processing was performed via continuous extrusion using a twin-screw extruder coupled with a calendaring system. The process was firstly optimized in terms of extrusion and post-extrusion conditions, as well as formulation to obtain a good cellular structure (uniform cell size distribution and high cell density)...
November 17, 2018: Materials
Stefan Beisl, Sílvia Monteiro, Ricardo Santos, Ana Sofia Figueiredo, María Guadalupe Sánchez-Loredo, Maria Amélia Lemos, Francisco Lemos, Miguel Minhalma, Maria Norberta de Pinho
The present work addresses the synthesis of nanofiltration composite membranes with bactericide properties. The cellulose acetate based membranes with polyvinylpyrrolidone coated silver nanoparticles, silver ion-exchanged β-zeolite and β-zeolite are casted by the phase inversion technique and subjected to an annealing post-treatment. They are characterized in terms of the nanofiltration permeation performance and antibacterial properties. The incorporation of silver nanoparticles produces a threefold increase in the membrane hydraulic permeability when compared to the silver-free membranes and the incorporation of silver ion loaded zeolite resulted in a 56...
November 5, 2018: Water Research
Sheng Zhou, Yanying Wei, Libo Li, Yifan Duan, Qianqian Hou, Lili Zhang, Liang-Xin Ding, Jian Xue, Haihui Wang, Jürgen Caro
Metal-organic framework (MOF) membranes show great promise for propene/propane separation, yet a sharp molecular sieving has not been achieved due to their inherent linker mobility. Here, zeolitic imidazolate framework ZIF-8-type membranes with suppressed linker mobility are prepared by a fast current-driven synthesis (FCDS) strategy within 20 min, showing sharpened molecular sieving for propene/propane separation with a separation factor above 300. During membrane synthesis, the direct current promotes the metal ions and ligands to assemble into inborn-distorted and stiffer frameworks with ZIF-8_Cm (a newly discovered polymorph of ZIF-8) accounting for 60 to 70% of the membrane composition...
October 2018: Science Advances
Fereshteh Rashidi, Johannes Leisen, Seok-Jhin Kim, Ali A Rownaghi, Christopher W Jones, Sankar Nair
New membrane-based molecular separation processes are an essential part of the strategy for sustainable chemical production. A large literature on "hybrid" or "mixed-matrix" membranes exists, in which nanoparticles of a higher-performance porous material are dispersed in a polymeric matrix to boost performance. We demonstrate that the hybrid membrane concept can be redefined to achieve much higher performance if the membrane matrix and the dispersed phase are both nanoporous crystalline materials, with no polymeric phase...
November 6, 2018: Angewandte Chemie
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