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  • 1
    Online Resource
    Online Resource
    Controlled growth of Faujasite zeolite with NaX topology by manipulating solution aging and Na2O/Al2O3 ratios
    Elsevier BV ; 2020
    In:  Colloids and Surfaces A: Physicochemical and Engineering Aspects Vol. 600 ( 2020-09), p. 124803-
    Details
    In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier BV, Vol. 600 ( 2020-09), p. 124803-
    Type of Medium: Online Resource
    ISSN: 0927-7757
    URL: Article
    DOI: 10.1016/j.colsurfa.2020.124803
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 1500517-3
    detail.hit.zdb_id: 1169792-1
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  • 2
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    Modified Zeolite/Polysulfone Mixed Matrix Membrane for Enhanced CO2/CH4 Separation
    MDPI AG ; 2021
    In:  Membranes Vol. 11, No. 8 ( 2021-08-16), p. 630-
    Details
    In: Membranes, MDPI AG, Vol. 11, No. 8 ( 2021-08-16), p. 630-
    Abstract: In recent years, mixed matrix membranes (MMMs) have received worldwide attention for their potential to offer superior gas permeation and separation performance involving CO2 and CH4. However, fabricating defect-free MMMs still remains as a challenge where the incorporation of fillers into MMMs has usually led to some issues including formation of undesirable interfacial voids, which may jeopardize the gas separation performance of the MMMs. This current work investigated the incorporation of zeolite RHO and silane-modified zeolite RHO (NH2–RHO) into polysulfone (PSf) based MMMs with the primary aim of enhancing the membrane’s gas permeation and separation performance. The synthesized zeolite RHO, NH2–RHO, and fabricated membranes were characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared-attenuated total reflection (FTIR-ATR), thermogravimetric analysis (TGA) and field emission scanning election microscopy (FESEM). The effects of zeolite loading in the MMMs on the CO2/CH4 separation performance were investigated. By incorporating 1 wt% of zeolite RHO into the MMMs, the CO2 permeability and ideal CO2/CH4 selectivity slightly increased by 4.2% and 2.7%, respectively, compared to that of a pristine PSf membrane. On the other hand, a significant enhancement of 45% in ideal CO2/CH4 selectivity was attained by MMMs incorporated with 2 wt% of zeolite NH2-RHO compared to a pristine PSf membrane. Besides, all MMMs incorporated with zeolite NH2-RHO displayed higher ideal CO2/CH4 selectivity than that of the MMMs incorporated with zeolite RHO. By incorporating 1–3 wt% zeolite NH2-RHO into PSf matrix, MMMs without interfacial voids were successfully fabricated. Consequently, significant enhancement in ideal CO2/CH4 selectivity was enabled by the incorporation of zeolite NH2–RHO into MMMs.
    Type of Medium: Online Resource
    ISSN: 2077-0375
    URL: Article
    DOI: 10.3390/membranes11080630
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2614641-1
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  • 3
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    Online Resource
    Two-Dimensional Conjugated Mass Transfer of Carbon Dioxide Absorption in a Hollow-Fiber Gas-Liquid Membrane Contactor
    MDPI AG ; 2022
    In:  Membranes Vol. 12, No. 10 ( 2022-10-20), p. 1021-
    Details
    In: Membranes, MDPI AG, Vol. 12, No. 10 ( 2022-10-20), p. 1021-
    Abstract: The absorption efficiencies of CO2 in hollow-fiber membrane contactors using an ethanolamine (MEA) solvent under both concurrent- and countercurrent-flow operations were investigated theoretically and experimentally. Two-dimensional mathematical modeling was developed by Happel’s free surface model, and the resultant partial differential equations were solved analytically using the separated variables method with the use of an orthogonal expansion technique. A simplified expression of Sherwood number variations was reported by employing the relevant operations conditions and expressed in terms of the computed eigenvalues for predicting concentration distribution and absorption efficiency. It is emphasized that, in comparing various fiber packing configurations, both theoretical predictions and experimental results should be compared to find the absorption flux increment accomplished by the CO2/N2 stream passing through the fiber cells under the same mass flow rate. The value of the present mathematical treatment is evident to propose a simplified expression of the averaged Sherwood number variations, and provides the predictions of the absorption flux, absorption efficiency, average Sherwood number with the absorbent Graetz number, inlet CO2 concentration, and absorbent flow rates as parameters. The availability of such concise expressions, as developed directly from the analytical formulations, is the value of the present study. The experiments of the CO2 absorption using MEA with alumina (Al2O3) hollow fiber membranes are also set up to confirm the accuracy of the theoretical predictions. The accuracy derivations between the experimental results and theoretical predictions for concurrent- and countercurrent-flow operations are 4.10×10−2≤E≤1.50×10−2 and 1.40×10−2≤E≤9.0×10−1, respectively. The operations of the hollow-fiber membrane contactor implementing N = 7 fiber cells and N = 19 fiber cells offer an inexpensive method of improving absorption efficiency by increasing fiber numbers with consideration of device performance.
    Type of Medium: Online Resource
    ISSN: 2077-0375
    URL: Article
    DOI: 10.3390/membranes12101021
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2614641-1
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  • 4
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    Enhancing Absorption Performance of CO2 by Amine Solution through the Spiral Wired Channel in Concentric Circular Membrane Contactors
    MDPI AG ; 2021
    In:  Membranes Vol. 12, No. 1 ( 2021-12-21), p. 4-
    Details
    In: Membranes, MDPI AG, Vol. 12, No. 1 ( 2021-12-21), p. 4-
    Abstract: The CO2 absorption rate by using a Monoethanolamide (MEA) solution through the spiral wired channel in concentric circular membrane contactors under both concurrent-flow and countercurrent-flow operations was investigated experimentally and theoretically. The one-dimensional mathematical modeling equation developed for predicting the absorption rate and concentration distributions was solved numerically using the fourth Runge–Kutta method under various absorbent flow rate, CO2 feed flow rate and inlet CO2 concentration in the gas feed. An economical viewpoint of the spiral wired module was examined by assessing both absorption flux improvement and power consumption increment. Meanwhile, the correlated average Sherwood number to predict the mass-transfer coefficient of the CO2 absorption mechanisms in a concentric circular membrane contactor with the spiral wired annulus channel is also obtained in a generalized and simplified expression. The theoretical predictions of absorption flux improvement were validated by experimental results in good agreements. The amine solution flowing through the annulus of a concentric circular tube, which was inserted in a tight-fitting spiral wire in a small annular spacing, could enhance the CO2 absorption flux improvement due to reduction of the concentration polarization effect. A larger concentration polarization coefficient (CPC) was achieved in the countercurrent-flow operations than that in concurrent-flow operations for various operations conditions and spiral-wire pitches. The absorption flux improvement for inserting spiral wire in the concentric circular module could provide the maximum relative increment up to 46.45%.
    Type of Medium: Online Resource
    ISSN: 2077-0375
    URL: Article
    DOI: 10.3390/membranes12010004
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2614641-1
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  • 5
    Online Resource
    Online Resource
    Optimization of CO2/H2 Separation over Ba-SAPO-34 Zeolite Membrane Synthesized by Microwave Heating
    MDPI AG ; 2022
    In:  Membranes Vol. 12, No. 9 ( 2022-08-30), p. 850-
    Details
    In: Membranes, MDPI AG, Vol. 12, No. 9 ( 2022-08-30), p. 850-
    Abstract: CO2/H2 separation using membrane technology is an important research area in order to obtain high purity hydrogen as one source of clean energy. Finding a suitable inorganic membrane is one of the critical issues, which needs to be explored for CO2/H2 separation. In the present study, Ba-SAPO-34 zeolite membrane was synthesized and followed by a modification process. CO2/H2 separation of the membrane was investigated by varying the independent process variables (CO2 % in the feed, pressure difference across the membrane and temperature). Modeling and optimization for the responses (CO2/H2 separation selectivity and CO2 permeance) was performed by applying response surface methodology and central composite design, which is available in Design Expert software. The accuracy of the models in predicting the response was tested by comparing with the experimental value of response and the two values were in good agreement. The optimization of the models gave CO2 permeance of 19.23 × 10−7 mol/m2 s Pa and CO2/H2 separation selectivity of 11.6 at 5% CO2 in the feed, a pressure difference of 100 kPa, and temperature of 30 °C for Ba-SAPO-34 zeolite membrane.
    Type of Medium: Online Resource
    ISSN: 2077-0375
    URL: Article
    DOI: 10.3390/membranes12090850
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2614641-1
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  • 6
    Online Resource
    Online Resource
    Synthesis of novel magneto-hybrid polyoxometalate composite membrane with simultaneous photocatalytic self-cleaning and antifouling functionalities
    Springer Science and Business Media LLC ; 2023
    In:  Frontiers of Chemical Science and Engineering
    Details
    In: Frontiers of Chemical Science and Engineering, Springer Science and Business Media LLC
    Type of Medium: Online Resource
    ISSN: 2095-0179 , 2095-0187
    URL: Article
    DOI: 10.1007/s11705-023-2310-3
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2601267-4
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  • 7
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    Online Resource
    Prediction of CO2 Permeability in NH2-MIL-53(Al)/Cellulose Acetate Mixed matrix Membranes using Theoretical Models
    Penerbit UTHM ; 2018
    In:  International Journal of Integrated Engineering Vol. 10, No. 5 ( 2018-10-01)
    Details
    In: International Journal of Integrated Engineering, Penerbit UTHM, Vol. 10, No. 5 ( 2018-10-01)
    Type of Medium: Online Resource
    ISSN: 2229-838X , 2600-7916
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.30880/ijie.2018.10.05
    DOI: 10.30880/ijie
    DOI: 10.30880/ijie.2018.10.05.026
    Language: Unknown
    Publisher: Penerbit UTHM
    Publication Date: 2018
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  • 8
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    Online Resource
    A Review on Insights for Green Production of Unconventional Protein and Energy Sources Derived from the Larval Biomass of Black Soldier Fly
    MDPI AG ; 2020
    In:  Processes Vol. 8, No. 5 ( 2020-04-28), p. 523-
    Details
    In: Processes, MDPI AG, Vol. 8, No. 5 ( 2020-04-28), p. 523-
    Abstract: The purpose of this review is to reveal the lipid and protein contents in black soldier fly larvae (BSFL) for the sustainable production of protein and energy sources. It has been observed from studies in the literature that the larval lipid and protein contents vary with the rearing conditions as well as the downstream processing employed. The homogenous, heterogenous and microbial-treated substrates via fermentation are used to rear BSFL and are compared in this review for the simultaneous production of larval protein and biodiesel. Moreover, the best moisture content and the aeration rate of larval feeding substrates are also reported in this review to enhance the growth of BSFL. As the downstream process after harvesting starts with larval inactivation, various related methods have also been reviewed in relation to its impact on the quality/quantity of larval protein and lipids. Subsequently, the other downstream processes, namely, extraction and transesterification to biodiesel, are finally epitomized from the literature to provide a comprehensive review for the production of unconventional protein and lipid sources from BSFL feedstock. Incontrovertibly, the review accentuates the great potential use of BSFL biomass as a green source of protein and lipids for energy production in the form of biodiesel. The traditional protein and energy sources, preponderantly fishmeal, are unsustainable naturally, pressingly calling for immediate substitutions to cater for the rising demands. Accordingly, this review stresses the benefits of using BSFL biomass in detailing its production from upstream all the way to downstream processes which are green and economical at the same time.
    Type of Medium: Online Resource
    ISSN: 2227-9717
    URL: Article
    DOI: 10.3390/pr8050523
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2720994-5
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  • 9
    Online Resource
    Online Resource
    The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation
    Springer Science and Business Media LLC ; 2021
    In:  Journal of Polymer Research Vol. 28, No. 5 ( 2021-05)
    Details
    In: Journal of Polymer Research, Springer Science and Business Media LLC, Vol. 28, No. 5 ( 2021-05)
    Abstract: Carbon dioxide (CO 2 ) emissions have been the root cause for anthropogenic climate change. Decarbonisation strategies, particularly carbon capture and storage (CCS) are crucial for mitigating the risk of global warming. Among all current CO 2 separation technologies, membrane separation has the biggest potential for CCS as it is inexpensive, highly efficient, and simple to operate. Polymeric membranes are the preferred choice for the gas separation industry due to simpler methods of fabrication and lower costs compared to inorganic or mixed matrix membranes (MMMs). However, plasticisation and upper-bound trade-off between selectivity and permeability has limited the gas separation performance of polymeric membranes. Recently, researchers have found that the blending of glassy and rubbery polymers can effectively minimise trade-off between selectivity and permeability. Glassy poly(ethersulfone) (PES) and rubbery poly(ethylene) glycol (PEG) are polymers that are known to have a high affinity towards CO 2 . In this paper, PEG and PES are reviewed as potential polymer blend that can yield a final membrane with high CO 2 permeance and CO 2 /nitrogen (N 2 ) selectivity. Gas separation properties can be enhanced by using different solvents in the phase-inversion process. N-Methyl-2-Pyrrolidone (NMP) and Dimethylformamide (DMF) are common industrial solvents used for membrane fabrication. Both NMP and DMF are reviewed as prospective solvent blend that can improve the morphology and separation properties of PES/PEG blend membranes due to their effects on the membrane structure which increases permeation as well as selectivity. Thus, a PES/PEG blend polymeric membrane fabricated using NMP and DMF solvents is believed to be a major prospect for CO 2 /N 2 gas separation.
    Type of Medium: Online Resource
    ISSN: 1022-9760 , 1572-8935
    URL: Article
    DOI: 10.1007/s10965-021-02500-6
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2065616-6
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  • 10
    Online Resource
    Online Resource
    Optimization of spinning parameters on the fabrication of NH2-MIL-53(Al)/cellulose acetate (CA) hollow fiber mixed matrix membrane for CO2 separation
    Elsevier BV ; 2019
    In:  Separation and Purification Technology Vol. 215 ( 2019-05), p. 32-43
    Details
    In: Separation and Purification Technology, Elsevier BV, Vol. 215 ( 2019-05), p. 32-43
    Type of Medium: Online Resource
    ISSN: 1383-5866
    URL: Article
    DOI: 10.1016/j.seppur.2018.12.086
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2019
    detail.hit.zdb_id: 2022535-0
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