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Saravanan Janakiram
Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway

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Journal article
Published: 25 November 2020 in Membranes
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Numerous studies have been reported on CO2 facilitated transport membrane synthesis, but few works have dealt with the interaction between material synthesis and transport modelling aspects for optimization purposes. In this work, a hybrid fixed-site carrier membrane was prepared using polyallylamine with 10 wt% polyvinyl alcohol and 0.2 wt% graphene oxide. The membrane was tested using the feed gases with different relative humidity and at different CO2 partial pressures. Selected facilitated transport models reported in the literature were used to fit the experimental data with good agreement. The key dimensionless facilitated transport parameters were obtained from the modelling and data fitting. Based on the values of these parameters, it was shown that the diffusion of the amine-CO2 reaction product was the rate-controlling step of the overall CO2 transport through the membrane. It was shown theoretically that by decreasing the membrane selective layer thickness below the actual value of 1 µm to a value of 0.1 µm, a CO2 permeance as high as 2500 GPU can be attained while maintaining the selectivity at a value of about 19. Furthermore, improving the carrier concentration by a factor of two might shift the performances above the Robeson upper bound. These potential paths for membrane performance improvement have to be confirmed by targeted experimental work.

ACS Style

Bouchra Belaissaoui; Elsa Lasseuguette; Saravanan Janakiram; Liyuan Deng; Maria-Chiara Ferrari. Analysis of CO2 Facilitation Transport Effect through a Hybrid Poly(Allyl Amine) Membrane: Pathways for Further Improvement. Membranes 2020, 10, 367 .

AMA Style

Bouchra Belaissaoui, Elsa Lasseuguette, Saravanan Janakiram, Liyuan Deng, Maria-Chiara Ferrari. Analysis of CO2 Facilitation Transport Effect through a Hybrid Poly(Allyl Amine) Membrane: Pathways for Further Improvement. Membranes. 2020; 10 (12):367.

Chicago/Turabian Style

Bouchra Belaissaoui; Elsa Lasseuguette; Saravanan Janakiram; Liyuan Deng; Maria-Chiara Ferrari. 2020. "Analysis of CO2 Facilitation Transport Effect through a Hybrid Poly(Allyl Amine) Membrane: Pathways for Further Improvement." Membranes 10, no. 12: 367.

Journal article
Published: 21 August 2020 in Green Energy & Environment
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In this study, cellulose nanofibrils (CNF) of high charge (H-P-CNF) and screened size (H-P-CNF-S) were fabricated by increasing the charge of phosphorylated cellulose nanofibrils (P-CNFs) during the pre-treatment step of CNF production. Results show that the H-P-CNF have a significantly higher charge (3.41 mmol g-1) compared with P-CNF (1.86 mmol g-1). Centrifugation of H-P-CNF gave a supernatant with higher charge (5.4 mmol g-1) and a reduced size (H-P-CNF-S). These tailored nanocelluloses were added to polyvinyl alcohol (PVA) solutions and the suspensions were successfully coated on porous polysulfone (PSf) supports to produce thin-film nanocomposite membranes. The humid mixed gas permeation tests show that CO2 permeability increases for membranes with the addition of H-P-CNF-S by 52% and 160%, compared with the P-CNF/PVA membrane and neat PVA membrane, respectively.

ACS Style

Ragne Marie Lilleby Helberg; Jonathan Ø. Torstensen; Zhongde Dai; Saravanan Janakiram; Gary Chinga-Carrasco; Øyvind W. Gregersen; Kristin Syverud; Liyuan Deng. Nanocomposite membranes with high-charge and size-screened phosphorylated nanocellulose fibrils for CO2 separation. Green Energy & Environment 2020, 6, 585 -596.

AMA Style

Ragne Marie Lilleby Helberg, Jonathan Ø. Torstensen, Zhongde Dai, Saravanan Janakiram, Gary Chinga-Carrasco, Øyvind W. Gregersen, Kristin Syverud, Liyuan Deng. Nanocomposite membranes with high-charge and size-screened phosphorylated nanocellulose fibrils for CO2 separation. Green Energy & Environment. 2020; 6 (4):585-596.

Chicago/Turabian Style

Ragne Marie Lilleby Helberg; Jonathan Ø. Torstensen; Zhongde Dai; Saravanan Janakiram; Gary Chinga-Carrasco; Øyvind W. Gregersen; Kristin Syverud; Liyuan Deng. 2020. "Nanocomposite membranes with high-charge and size-screened phosphorylated nanocellulose fibrils for CO2 separation." Green Energy & Environment 6, no. 4: 585-596.

Paper
Published: 06 May 2020 in Green Chemistry
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A class of “green” hybrid membranes composed of nanocellulose and an ionic liquid exhibits exceptional separation properties arising from a humidity-responsive size-exclusive “gate” that allows selective CO2 permeation.

ACS Style

Saravanan Janakiram; Luca Ansaloni; Soo-Ah Jin; Xinyi Yu; Zhongde Dai; Richard J. Spontak; Liyuan Deng. Humidity-responsive molecular gate-opening mechanism for gas separation in ultraselective nanocellulose/IL hybrid membranes. Green Chemistry 2020, 22, 3546 -3557.

AMA Style

Saravanan Janakiram, Luca Ansaloni, Soo-Ah Jin, Xinyi Yu, Zhongde Dai, Richard J. Spontak, Liyuan Deng. Humidity-responsive molecular gate-opening mechanism for gas separation in ultraselective nanocellulose/IL hybrid membranes. Green Chemistry. 2020; 22 (11):3546-3557.

Chicago/Turabian Style

Saravanan Janakiram; Luca Ansaloni; Soo-Ah Jin; Xinyi Yu; Zhongde Dai; Richard J. Spontak; Liyuan Deng. 2020. "Humidity-responsive molecular gate-opening mechanism for gas separation in ultraselective nanocellulose/IL hybrid membranes." Green Chemistry 22, no. 11: 3546-3557.

Journal article
Published: 13 August 2019 in ACS Applied Materials & Interfaces
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The transition toward sustainable processing entails the use of biobased alternatives as functional materials to reduce the overall carbon footprint. Nanocellulose, due to its natural availability, biodegradability, excellent mechanical properties, tunable surface, and high aspect ratio, is attracting more and more interest as a nanoscale additive in polymeric membranes. In this work, an effective way to modify nanocellulose fibril surfaces for performance enhancement in CO2 separation membranes has been demonstrated. The functionalization promptly triggered intrinsic property responses in favor of nanofiber dispersion and CO2 transport. Thin composite membranes containing the modified nanofibers in water-swelling poly(vinyl alcohol) (PVA) as well as in the blend of sterically hindered polyallylamine (SHPAA) and PVA were fabricated and tested using humid gas permeation tests. Defect-free ultrathin (300 nm) hybrid selective layers containing evenly distributed nanofibers were successfully coated. The addition of nanocellulose exhibited enhanced CO2 permeance and CO2/N2 selectivity compared to those of the neat PVA membranes. CO2 permeance up to 652 GPU and a CO2/N2 selectivity of 41.3 with SHPAA/PVA blend were documented. Functionalization plays a categorical role in the dispersion of nanocellulose fibrils in the SHPAA/PVA blend, increasing the steric stabilization and interface compatibility with the polymer matrix. The tuned interface with PEG groups act as sites for water clusters retention and increased CO2 solubility, thus creating fast diffusion pathways for CO2 transport.

ACS Style

Saravanan Janakiram; Xinyi Yu; Luca Ansaloni; Zhongde Dai; Liyuan Deng. Manipulation of Fibril Surfaces in Nanocellulose-Based Facilitated Transport Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces 2019, 11, 33302 -33313.

AMA Style

Saravanan Janakiram, Xinyi Yu, Luca Ansaloni, Zhongde Dai, Liyuan Deng. Manipulation of Fibril Surfaces in Nanocellulose-Based Facilitated Transport Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces. 2019; 11 (36):33302-33313.

Chicago/Turabian Style

Saravanan Janakiram; Xinyi Yu; Luca Ansaloni; Zhongde Dai; Liyuan Deng. 2019. "Manipulation of Fibril Surfaces in Nanocellulose-Based Facilitated Transport Membranes for Enhanced CO2 Capture." ACS Applied Materials & Interfaces 11, no. 36: 33302-33313.

Research article
Published: 22 February 2019 in ACS Applied Materials & Interfaces
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Nanocellulose is a promising and sustainable bio-based nanomaterial due to its excellent mechanical properties, biocompatibility, natural abundance, and especially its high aspect ratio. Interest in applying nanocellulose as nanofillers in membrane fabrication has been growing rapidly in recent years. In the present work, nanocellulose crystals (CNC) and nanocellulose fibers (CNF) were incorporated into polyvinyl alcohol (PVA) to prepare evenly dispersed nanocomposite. The resultant nanocomposite materials containing up to 80 wt% of nanocellulose were coated as defect-free, thin-film-composite (TFC) selective layers onto hollow fiber membrane substrates via dip-coating for efficient CO2 capture. TGA, FTIR, XRD, STEM, SEM, and humid mixed gas permeation test were used to evaluate the nanocomposite materials and the membranes. The resultant PVA/CNC nanocomposite membranes exhibit both higher CO2 permeance and CO2/N2 selectivity compared to the PVA/CNF membranes and the neat PVA membranes. The addition of CNC showed more positive effects on the CO2 permeation compared to CNF. Under optimized conditions, CO2 permeance of 672 GPU with a CO2/N2 selectivity of 43.6 was obtained with a PVA/CNC membrane. Excellent long-term stability of the membrane was also documented within a period of up to one year. The interface between the polymer phase and the charged nanocellulose fibers is believed to form fast gas transport channels at humid state and thus enhances CO2 permeation.

ACS Style

Zhongde Dai; Jing Deng; Qiang Yu; Ragne M Lilleby Helberg; Saravanan Janakiram; Luca Ansaloni; Liyuan Deng. Fabrication and Evaluation of Bio-Based Nanocomposite TFC Hollow Fiber Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces 2019, 11, 10874 -10882.

AMA Style

Zhongde Dai, Jing Deng, Qiang Yu, Ragne M Lilleby Helberg, Saravanan Janakiram, Luca Ansaloni, Liyuan Deng. Fabrication and Evaluation of Bio-Based Nanocomposite TFC Hollow Fiber Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces. 2019; 11 (11):10874-10882.

Chicago/Turabian Style

Zhongde Dai; Jing Deng; Qiang Yu; Ragne M Lilleby Helberg; Saravanan Janakiram; Luca Ansaloni; Liyuan Deng. 2019. "Fabrication and Evaluation of Bio-Based Nanocomposite TFC Hollow Fiber Membranes for Enhanced CO2 Capture." ACS Applied Materials & Interfaces 11, no. 11: 10874-10882.

Journal article
Published: 13 February 2019 in Journal of Membrane Science
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In this work, defect-free thin-film-composite (TFC) hollow fiber membranes containing various amino acid salts as CO2 facilitated transport carriers were fabricated via dip-coating. Four different amino acid salts, i.e., potassium prolinate (ProK), potassium argininate (ArgK), potassium glycinate (GlyK) and potassium cysteinate (CysK), were selected and embedded within polyvinyl alcohol (PVA) matrix. TGA, FTIR, SEM and humid mixed gas permeation test were used for the evaluation. Experiments show that adding amino acid salts into the PVA matrix significantly increases the CO2 permeance with little influence on the CO2/N2 selectivity. ProK was found the most effective within the four investigated mobile carriers; The addition of 40% ProK into the PVA matrix nearly doubled the CO2 permeance (from 399 to 791 GPU). The PVA/amino acid salt membranes also exhibited good long-term stability, in which both CO2 permeance and CO2/N2 selectivity remained nearly unchanged in a 20-h test and after a two-week shutdown period.

ACS Style

Zhongde Dai; Jing Deng; Luca Ansaloni; Saravanan Janakiram; Liyuan Deng. Thin-film-composite hollow fiber membranes containing amino acid salts as mobile carriers for CO2 separation. Journal of Membrane Science 2019, 578, 61 -68.

AMA Style

Zhongde Dai, Jing Deng, Luca Ansaloni, Saravanan Janakiram, Liyuan Deng. Thin-film-composite hollow fiber membranes containing amino acid salts as mobile carriers for CO2 separation. Journal of Membrane Science. 2019; 578 ():61-68.

Chicago/Turabian Style

Zhongde Dai; Jing Deng; Luca Ansaloni; Saravanan Janakiram; Liyuan Deng. 2019. "Thin-film-composite hollow fiber membranes containing amino acid salts as mobile carriers for CO2 separation." Journal of Membrane Science 578, no. : 61-68.

Review
Published: 28 July 2018 in Membranes
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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. Infinite possibilities of tuning the porous architecture of these nanofillers also facilitate simultaneous enhancement of permeability, selectivity and stability features of the membrane conveniently heading in the direction towards industrial realization. This review focuses on presenting a complete synopsis of inherent capacities of several porous nanofillers, like metal organic frameworks (MOFs), Zeolites, and porous organic frameworks (POFs) and the effects on their addition to polymeric membranes. Gas permeation performances of select hybrids with these three-dimensional (3D) fillers and porous nanosheets have been summarized and discussed with respect to each type. Consequently, the benefits and shortcomings of each class of materials have been outlined and future research directions concerning the hybrids with 3D fillers have been suggested.

ACS Style

Mahdi Ahmadi; Saravanan Janakiram; Zhongde Dai; Luca Ansaloni; Liyuan Deng. Performance of Mixed Matrix Membranes Containing Porous Two-Dimensional (2D) and Three-Dimensional (3D) Fillers for CO2 Separation: A Review. Membranes 2018, 8, 50 .

AMA Style

Mahdi Ahmadi, Saravanan Janakiram, Zhongde Dai, Luca Ansaloni, Liyuan Deng. Performance of Mixed Matrix Membranes Containing Porous Two-Dimensional (2D) and Three-Dimensional (3D) Fillers for CO2 Separation: A Review. Membranes. 2018; 8 (3):50.

Chicago/Turabian Style

Mahdi Ahmadi; Saravanan Janakiram; Zhongde Dai; Luca Ansaloni; Liyuan Deng. 2018. "Performance of Mixed Matrix Membranes Containing Porous Two-Dimensional (2D) and Three-Dimensional (3D) Fillers for CO2 Separation: A Review." Membranes 8, no. 3: 50.

Review
Published: 14 May 2018 in Membranes
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Membrane technology has the potential to be an eco-friendly and energy-saving solution for the separation of CO2 from different gaseous streams due to the lower cost and the superior manufacturing features. However, the performances of membranes made of conventional polymers are limited by the trade-off between the permeability and selectivity. Improving the membrane performance through the addition of nanofillers within the polymer matrix offers a promising strategy to achieve superior separation performance. This review aims at providing a complete overview of the recent advances in nanocomposite membranes for enhanced CO2 separation. Nanofillers of various dimensions and properties are categorized and effects of nature and morphology of the 0D to 2D nanofillers in the corresponding nanocomposite membranes of different polymeric matrixes are discussed with regard to the CO2 permeation properties. Moreover, a comprehensive summary of the performance data of various nanocomposite membranes is presented. Finally, the advantages and challenges of various nanocomposite membranes are discussed and the future research and development opportunities are proposed.

ACS Style

Saravanan Janakiram; Mahdi Ahmadi; Zhongde Dai; Luca Ansaloni; Liyuan Deng. Performance of Nanocomposite Membranes Containing 0D to 2D Nanofillers for CO2 Separation: A Review. Membranes 2018, 8, 24 .

AMA Style

Saravanan Janakiram, Mahdi Ahmadi, Zhongde Dai, Luca Ansaloni, Liyuan Deng. Performance of Nanocomposite Membranes Containing 0D to 2D Nanofillers for CO2 Separation: A Review. Membranes. 2018; 8 (2):24.

Chicago/Turabian Style

Saravanan Janakiram; Mahdi Ahmadi; Zhongde Dai; Luca Ansaloni; Liyuan Deng. 2018. "Performance of Nanocomposite Membranes Containing 0D to 2D Nanofillers for CO2 Separation: A Review." Membranes 8, no. 2: 24.