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Publications (10 of 21) Show all publications
Matsakas, L., Gerber, M., Yu, L., Rova, U. & Christakopoulos, P. (2020). Preparation of low carbon impact lignin nanoparticles with controllable size by using different strategies for particles recovery. Industrial crops and products (Print), 147, Article ID 112243.
Open this publication in new window or tab >>Preparation of low carbon impact lignin nanoparticles with controllable size by using different strategies for particles recovery
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2020 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 147, article id 112243Article in journal (Refereed) Published
Abstract [en]

Lignin still remains an underutilized plentiful resource whose conversion to high-added value products is a cornerstone towards establishing a viable biomass biorefinery. Bio-materials in the form of nanoparticles represent promising high-value products with numerous downstream applications. The aim of the current work was to develop a method that would allow controlling the size of (birch and spruce) lignin nano- and micro-particles for their subsequent recovery into a solid product. We tested different two-step and one-step isolation processes and demonstrated that particle size could be easily controlled to meet different ranges (<100 nm, <500 nm, and>1 μm). In general, two-step isolation methods, i.e. a step of decrease of solvent concentration followed by isolation of lignin particles, were better for the isolation of well-defined spherical particles. In particular, the rate at which ethanol concentration was decreased played a significant role in determining the size of lignin particles. Moreover, when lignin concentration was increased from 1 % to 5 % and 10 % (w/v), particle size and homogeneity decreased slightly, but productivity augmented. The present study demonstrates that different isolation methods can be applied to obtain renewable, customarily sized, lignin spherical micro- and nano-particles.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Lignin, Nanoparticles, Organosolv, Birch, Spruce
National Category
Bioprocess Technology Chemical Process Engineering
Research subject
Biochemical Process Engineering; Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-77832 (URN)10.1016/j.indcrop.2020.112243 (DOI)2-s2.0-85079670850 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-02-24 (alebob)

Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-04-22Bibliographically approved
Li, J., Jiang, L., Yu, L. & Zhang, L. (2020). Preparation of Silica@Silica Core–Shell Microspheres Using an Aqueous Two-Phase System in a Novel Microchannel Device. Langmuir, 36(2), 576-584
Open this publication in new window or tab >>Preparation of Silica@Silica Core–Shell Microspheres Using an Aqueous Two-Phase System in a Novel Microchannel Device
2020 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 36, no 2, p. 576-584Article in journal (Refereed) Published
Abstract [en]

In the present work, a novel microchannel device was developed and used for the preparation of core–shell microspheres combining with a dextran/poly(ethylene glycol) diacrylate (DEX/PEGDA) aqueous two-phase system. Silica@silica core–shell microspheres were prepared as a model material. Silica@silica core–shell microspheres with different sizes of cores and thicknesses of shells were prepared by using different flowrate ratios of DEX/silica and PEGDA/silica aqueous solutions. The content of colloidal silica and the calcination temperature have a significant effect on the texture properties of the prepared core–shell microspheres. The surface area decreased from 199 to 177 m2/g with an increase in the colloidal silica content from 30 to 60 wt %. For a specific colloidal silica content (50 wt %), with the increase in calcination temperature from room temperature to 650 °C, the total pore volume went through a maximum of 0.7 cm3 g–1 with a surface area of 178 m2 g–1 and pore size of 7.32 nm at 450 °C. Due to the accumulation of metal nanoparticles in DEX, different metal nanoparticles (Ni and Pd) were successfully introduced into the core of the core–shell microspheres for the preparation of silica/metal nanoparticles@silica core–shell microsphere catalysts. The catalysts showed similar catalytic performance as the metal nanoparticles for hydrogenation of 4-nitrophenol with a conversion higher than 95%. However, the core–shell microsphere catalyst is much easier to recover. The reuse experiments indicated that the core–shell catalyst has high stability.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020
Keywords
Metal nanoparticles, Solution chemistry, Silica, Catalysts, Microspheres
National Category
Chemical Engineering Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-77278 (URN)10.1021/acs.langmuir.9b03034 (DOI)000509420200012 ()31877048 (PubMedID)2-s2.0-85078369266 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-01-31 (johcin)

Available from: 2020-01-02 Created: 2020-01-02 Last updated: 2020-04-20Bibliographically approved
Yu, L., Holmgren, A. & Hedlund, J. (2019). A novel method for fabrication of high-flux zeolite membranes on supports with arbitrary geometry. Journal of Materials Chemistry A, 7(17), 10325-10330
Open this publication in new window or tab >>A novel method for fabrication of high-flux zeolite membranes on supports with arbitrary geometry
2019 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, no 17, p. 10325-10330Article in journal (Refereed) Published
Abstract [en]

A novel procedure for the preparation of high-flux zeolite membranes was developed. This method relies on rendering the support hydrophobic, and thereby protected from the synthesis mixture and invasion of the support pores, while the cationic polymer on the surface still allowed deposition of zeolite seeds. Both high-flux MFI and CHA zeolite films were grown on both discs and tubular supports, which illustrates the applicability of the method to arbitrary membrane geometries. Typically, MFI disc membranes showed a very high CO2permeance of 85 × 10−7 mol m−2 s−1 Pa−1 and a CO2/H2 separation selectivity of 56 at 278 K and CHA disc membranes showed a very high CO2 permeance of 79 × 10−7 mol m−2 s−1 Pa−1 and a CO2/CH4 separation selectivity of 76 at 249 K. As the method is applicable to supports with complex geometries, it is suitable for preparation of membranes for industrial applications.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-73583 (URN)10.1039/C9TA00789J (DOI)000472183200016 ()2-s2.0-85064990509 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-24 (johcin)

Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-07-10Bibliographically approved
Nobandegani, M., Yu, L., Mayne, B. & Hedlund, J. (2019). Adsorption and transport of CO2 and CH4 in CHA zeolite. In: : . Paper presented at 8th International Zeolite Membrane Meeting, IZMM2019.
Open this publication in new window or tab >>Adsorption and transport of CO2 and CH4 in CHA zeolite
2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Chemical Engineering Chemical Sciences
Identifiers
urn:nbn:se:ltu:diva-77178 (URN)
Conference
8th International Zeolite Membrane Meeting, IZMM2019
Available from: 2019-12-15 Created: 2019-12-15 Last updated: 2020-04-29
Nobandegani, M. S., Yu, L., Mayne, B. & Hedlund, J. (2019). Adsorption and transport of CO2 and CH4 in CHA zeolite. In: : . Paper presented at 8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige.
Open this publication in new window or tab >>Adsorption and transport of CO2 and CH4 in CHA zeolite
2019 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-76973 (URN)
Conference
8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige
Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2020-05-20Bibliographically approved
Yan, B., Yu, S., Zeng, C., Yu, L., Wang, C. & Zhang, L. (2019). Binderless zeolite NaX microspheres with enhanced CO2 adsorption selectivity. Microporous and Mesoporous Materials, 278, 267-274
Open this publication in new window or tab >>Binderless zeolite NaX microspheres with enhanced CO2 adsorption selectivity
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2019 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 278, p. 267-274Article in journal (Refereed) Published
Abstract [en]

Zeolite NaX@NaA core-shell microspheres were prepared via a post-treatment secondary growth of zeolite NaA films on outer surface of binderless zeolite NaX microspheres. The obtained core-shell microspheres were composed of intergrown octahedral NaX particles inside, with particles size of ca. 500–750 nm, and continuous zeolite NaA films on the outer surface with the thickness of about 2 μm. Higher CO2 separation performance was observed for the core-shell microspheres comparing to the parental binderless zeolite NaX microspheres. The ideal separation factors of zeolite NaX@NaA core-shell microspheres for CO2/CH4 and CO2/N2 were 13 and 47, and the adsorption selectivities for the corresponding binary mixtures were 308 and 923, significantly higher than the binderless zeolite NaX microspheres of 9 and 19 as well as 264 and 735, respectively. After K+ ion exchanging, the core-shell zeolite microspheres have even higher adsorption selectivities of 326 and 1109 for CO2/CH4 and CO2/N2 binary mixtures. The crushing strength of the binderless zeolite NaX microspheres was increased from 0.46 MPa to 3.42 MPa after the secondary growth. In addition, the growth of zeolite A film was resultant from interzeolite conversion and the interzeolite conversion was investigated by the conversion of zeolite NaX to NaA crystals in NaA membrane synthesis gel.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Zeolite, Core-shell microsphere, Membrane, Interzeolite conversion, CO2 separation
National Category
Chemical Engineering Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-72574 (URN)10.1016/j.micromeso.2018.12.002 (DOI)000459841900032 ()2-s2.0-85057613263 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-01-25 (svasva)

Available from: 2019-01-15 Created: 2019-01-15 Last updated: 2019-04-12Bibliographically approved
Hedlund, J., Yu, L. & Nobandegani, M. S. (2019). Diffusion of small molecules in ultra-thin MFI membranes. In: : . Paper presented at 8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige.
Open this publication in new window or tab >>Diffusion of small molecules in ultra-thin MFI membranes
2019 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-77098 (URN)
Conference
8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige
Available from: 2019-12-08 Created: 2019-12-08 Last updated: 2020-05-20Bibliographically approved
Yu, L., Nobandegani, M. & Hedlund, J. (2019). Highly permeable and selective CHA membranes for efficient CO2/CH4 separation. In: : . Paper presented at 8th International Zeolite Membrane Meeting(IZMM2019).
Open this publication in new window or tab >>Highly permeable and selective CHA membranes for efficient CO2/CH4 separation
2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ltu:diva-77448 (URN)
Conference
8th International Zeolite Membrane Meeting(IZMM2019)
Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-17
Yu, L., Nobandegani, M. S., Holmgren, A. & Hedlund, J. (2019). Highly permeable and selective tubular zeolite CHA membranes. Journal of Membrane Science, 588, Article ID 117224.
Open this publication in new window or tab >>Highly permeable and selective tubular zeolite CHA membranes
2019 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 588, article id 117224Article in journal (Refereed) Published
Abstract [en]

Highly permeable and selective tubular zeolite CHA membranes with a thickness of about 450 nm and a length of 100 mm and an inner diameter of 7 mm were evaluated by single gas permeation experiments and for separation of an equimolar CO2/CH4 mixture. The membranes displayed high H2 and CO2 single gas permeances of 55 × 10−7 mol m−2 s−1 Pa−1 and 94 × 10−7 mol m−2 s−1 Pa−1, respectively, and a very low SF6 permeance of 3 × 10−9 mol m−2 s−1 Pa−1. The highest observed mixture separation factor was 99 with CO2 permeance of 60 × 10−7 mol m−2 s−1 Pa−1 at a feed pressure of 5 bar and permeate pressure of 0.12 bar. The corresponding CO2flux was 1.46 mol m−2 s−1. The highest observed flux was 1.98 mol m−2 s−1 with a separation factor of 52 at a feed pressure of 10 bar and permeate pressure of 0.12 bar at room temperature. To the best of our knowledge, this is the first report describing highly permeable and selective tubular CHA membranes. The results indicate that the membranes have a great potential for industrial separation of CO2from natural gas and biogas.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Tubular zeolite CHA membrane, Gas separation, High permeance, Biogas, Natural gas
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-75258 (URN)10.1016/j.memsci.2019.117224 (DOI)000481577200017 ()
Note

Validerad;2019;Nivå 2;2019-07-08 (johcin)

Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-09-09Bibliographically approved
Cai, J., Jiang, L., Huaming, W., Chongqing, W., Yu, L. & Zhang, L. (2019). Preparation of carbon/cobalt composite from phenolic resin and ZIF-67 for efficient tannic acid adsorption. Microporous and Mesoporous Materials, 287, 9-17
Open this publication in new window or tab >>Preparation of carbon/cobalt composite from phenolic resin and ZIF-67 for efficient tannic acid adsorption
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2019 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 287, p. 9-17Article in journal (Refereed) Published
Abstract [en]

In the present work, a carbon/cobalt composite was prepared and evaluated for adsorption of ecologically harmful tannic acid (TA). The composite was prepared by simply mixing phenolic resin with ZIF-67 and following by carbonization. TEM and SEM images showed that ZIF-67 was etched by phenolic resin and cobalt nanoparticles were formed and evenly distributed in carbon. Macroporous structure was generated between the carbonized phenolic resin and ZIF-67. N2 adsorption-desorption isotherms results exhibited that the composite also had both micro- and meso-pores (average pore size of 5 nm) with a high surface area of 393 m2 g−1. Porous structure and evenly distributed cobalt nanoparticles facilitated the diffusion and adsorption of TA due to the formation of the complex between TA macromolecules and cobalt. The highest observed adsorption amount was as high as 2778 mg g−1, significantly higher than that of the carbon prepared from carbonization of phenolic resin (205 mg g−1) and ZIF-67 (1375 mg g−1). The carbon composite material is easy to recover and reuse due to the magnetic property. The reuse experiment also showed high stability of the composite. All of the results indicated a great potential of the developed carbon composite material in wastewater treatment in the industry.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Carbon composite, Phenolic resin, ZIF-67, Tannic acid adsorption, Wastewater treatment
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-74102 (URN)10.1016/j.micromeso.2019.05.046 (DOI)000475995600002 ()2-s2.0-85067963332 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-10 (oliekm)

Available from: 2019-05-30 Created: 2019-05-30 Last updated: 2019-08-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2656-857x

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