Fabrication variables affecting the structure and properties of supported carbon molecular sieve membranes for hydrogen separation
Permanent link to this recordhttp://hdl.handle.net/10754/598304
MetadataShow full item record
AbstractA high molecular weight polyimide (Matrimid) was used as a precursor for fabricating supported carbon molecular sieve membranes without crack formation at 550-700°C pyrolysis temperature. A one-step polymer (polyimide) coating method as precursor of carbon layer was used without needing a prior modification of a TiO 2 macroporous support. The following fabrication variables were optimized and studied to determine their effect on the carbon structure: polymeric solution concentration, solvent extraction, heating rate and pyrolysis temperature. Two techniques (Thermogravimetric analysis and Raman spectroscopy) were used to determine these effects on final carbon structure. Likewise, the effect of the support was also reported as an additional and important variable in the design of supported carbon membranes. Atomic force microscopy and differential scanning calorimetry quantified the degree of influence. Pure gas permeation tests were performed using CH 4, CO, CO 2 and H 2. The presence of a molecular sieving mechanism was confirmed after defects were plugged with PDMS solution at 12wt%. Gas selectivities higher than Knudsen theoretical values were reached with membranes obtained over 650°C, showing as best values 4.46, 4.70 and 10.62 for H 2/N 2, H 2/CO and H 2/CH 4 ratio, respectively. Permeance values were over 9.82×10 -9mol/(m 2Pas)during pure hydrogen permeation tests. © 2012 Elsevier B.V.
CitationBriceño K, Montané D, Garcia-Valls R, Iulianelli A, Basile A (2012) Fabrication variables affecting the structure and properties of supported carbon molecular sieve membranes for hydrogen separation. Journal of Membrane Science 415-416: 288–297. Available: http://dx.doi.org/10.1016/j.memsci.2012.05.015.
SponsorsThe authors are indebted to the Spanish Government for financial support (project CTQ2008-02491, partially funded by the FEDER program of the European Union) and to the commission of European Communities Specific OpenTok ProjectMTKD-LT-2005-030040. Dr. S. Nunes from the Water Desalination and Reuse Center at the King Abdullah University of Science and Technology (KAUST), Kingdom of Saudi Arabia, is acknowledged for providing the Matrimid polymer. Dr. J. L. Toca from the Department of Naniobiotechnology BOKU-Vienna and Dr. A. Lederer from the Leibniz-Institute of Polymer Research Dresden are acknowledged for their assistance with the AFM and Light Scattering measurements, respectively. Special thanks to Dr. Marta Giamberini and Dr. Jose Antonio Reina from Rovira I Virgili University for their support on realization of experiments.
JournalJournal of Membrane Science
CollectionsPublications Acknowledging KAUST Support
Showing items related by title, author, creator and subject.
Micro-and/or nano-scale patterned porous membranes, methods of making membranes, and methods of using membranesWang, Xianbin; Chen, Wei; Wang, Zhihong; Zhang, Xixiang; Yue, Weisheng; Lai, Zhiping (2015-01-22) [Patent]Embodiments of the present disclosure provide for materials that include a pre-designed patterned, porous membrane (e.g., micro- and/or nano-scale patterned), structures or devices that include a pre-designed patterned, porous membrane, methods of making pre-designed patterned, porous membranes, methods of separation, and the like.
Synthesis a new Membrane from the Nano-Cellulose Membrane and Nano-Ceramic Membrane in Bioreactor System into the Microbial Fuel Cell for Sewage Treatment by AlgaeAlsahli, Rawan (2019-01-27) [Poster]The problems of water shortage in the Middle East and North Africa (MENA) regions are well documented. The population, having more than doubled in the past 30 years to about 280 million, could double again in the next 30 years. As the population has grown against a background of finite freshwater resources, so the water available to individuals has fallen dramatically. A complete study examining the influence of through biological system will be used. Biological systems with algae within the microbial cell will be used in sewage purification in a sustainable and environmentally friendly manner. Biological wastewater treatment harnesses the action of bacteria and other microorganisms to clean water. It is used worldwide because it’s effective and more economical than many mechanical or chemical processes. We will use algae biomass to treat water from biological contaminants. To remove phosphorus, nitrogen, and ammonia. We will use a nano-cellulose membrane and nano ceramic membrane to make them as one membrane to filter water from chemical contaminants such as heavy metals and other contaminants. We will use algae biomass to treat water from biological contaminants. To remove phosphorus, nitrogen, and ammonia. We will use a nano-cellulose membrane and nano ceramic membrane to make them as one membrane to filter water from chemical contaminants such as heavy metals and other contaminants. Cellulose nanomaterials membrane remediation and membranes for water filtration, including their high surface area-to-volume ratio, low environmental impact, high strength, functional ability, and sustainability Ceramic nanomaterials membranes with many advantages, such as superior mechanical strength, higher chemical stability, and better acid and alkali resistant ability, have a promising prospect in water treatment fields. Hence, it is highly expected that ceramic MBR would be more sustainable for e-MBR assemble and application They will be used to synthesize a new membrane with better features and faster filtration and resistance Algae can be used in wastewater treatment for a range of purposes, including: 1. Reduction of BOD. 2. Removal of N and/or P. 3. Inhibition of coliforms. 4. Removal of heavy metals. This algae biomass could be used for: 1.methane production. 2.composting. 3.production of liquid fuels (pseudo-vegetable fuels). 4. as animal feed or in aquaculture. 5. production of fine chemicals. Heavy metal ions could be eliminated by several techniques as follows: • Chemical precipitation. • Reverse osmosis. • Electrochemical treatment techniques. • Ion exchange. • Membrane filtration. • Adsorption due to its low cost-effective, high efficiency, and simple to operate for removing trace levels of heavy metal ions. • Adsorption technology is regarded as the most promising one to remove heavy metal ions from effluents among these techniques mentioned above. Several types of materials to adsorb metal ions from aqueous solutions, such as activated: • Carbons. • Clay minerals. • Chelating materials. • Chitosan/natural zeolites. Ceramic Nanomaterials Membrane. Microbial Fuel Cells (MFCs) Cellulose Nanomaterials Membrane
Graphene-coated hollow fiber membrane as the cathode in anaerobic electrochemical membrane bioreactors – Effect of configuration and applied voltage on performance and membrane foulingWerner, Craig M.; Katuri, Krishna; Rao, Hari Ananda; Chen, Wei; Lai, Zhiping; Logan, Bruce E.; Amy, Gary L.; Saikaly, Pascal (Environmental Science & Technology, American Chemical Society (ACS), 2015-12-22) [Article]Electrically conductive, graphene-coated hollow-fiber porous membranes were used as cathodes in anaerobic electrochemical membrane bioreactors (AnEMBRs) operated at different applied voltages (0.7 V and 0.9 V) using a new rectangular reactor configuration, compared to a previous tubular design (0.7 V). The onset of biofouling was delayed and minimized in rectangular reactors operated at 0.9 V, compared to those at 0.7 V due to higher rates of hydrogen production. Maximum transmembrane pressures for the rectangular reactor were only 0.10 bar (0.7 V) or 0.05 bar (0.9 V) after 56 days of operation, compared to 0.46 bar (0.7 V) for the tubular reactor after 52 days. The thickness of the membrane biofouling layer was approximately 0.4 µm for rectangular reactors and 4 µm for the tubular reactor. Higher permeate quality (TSS = 0.05 mg/L) was achieved in the rectangular AnEMBR than the tubular AnEMBR (TSS = 17 mg/L), likely due to higher current densities that minimized the accumulation of cells in suspension. These results show that the new rectangular reactor design, which had increased rates of hydrogen production, successfully delayed the onset of cathode biofouling and improved reactor performance.