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de Carvalho, Danila Morais
Publikationer (9 of 9) Visa alla publikationer
Halysh, V., Sevastyanova, O., de Carvalho, D. M., Riazanova, A., Lindström, M. & Gomelya, M. (2019). Effect of oxidative treatment on composition and properties of sorbents prepared from sugarcane residues. Industrial crops and products (Print), 139, Article ID UNSP 111566.
Öppna denna publikation i ny flik eller fönster >>Effect of oxidative treatment on composition and properties of sorbents prepared from sugarcane residues
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2019 (Engelska)Ingår i: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 139, artikel-id UNSP 111566Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Efficient sorbents for the removal of cationic dye were prepared from sugarcane bagasse (stalk) and straw (leaves) by oxidative pre-treatment with hydrogen peroxide (H2O2) in acetic acid. The effects of variables, such as concentration of H2O2, temperature and time on the properties of the fiber sorbents obtained were studied according to a 2(3) full-factorial design. For comparison, an oxidative treatment of sugarcane biomass with glacial acetic acid was also used. The yields of the materials obtained and their chemical composition were characterized and compared. Fourier transform infrared spectroscopy, field-emission scanning electron microscopy and benzene vapor adsorption were used to investigate the structural properties and morphology of the initial materials and sorbents. The sorption of methylene blue dye was used to assess the efficiency of dye removal by the sorbents. The pre-treatment conditions significantly affected the sorbent yield, their chemical composition (contents of cellulose, lignin and ash) as well as their sorption properties. The cellulosic sorbent (C-sorbent) from sugarcane bagasse obtained by pre-treatment with H2O2 in acetic acid and the lignocellulosic sorbent (LC-sorbent) from sugarcane straw obtained by pre-treatment with glacial acetic acid, had the highest sorption capacity for the methylene blue dye. For both types of sorbents, the sorption capacity increased with chemical pretreatment as a result of an increase in pore volume.

Ort, förlag, år, upplaga, sidor
ELSEVIER, 2019
Nyckelord
Sugarcane, Straw, Bagasse, Oxidation, Sorbent
Nationell ämneskategori
Polymerkemi
Identifikatorer
urn:nbn:se:kth:diva-260986 (URN)10.1016/j.indcrop.2019.111566 (DOI)000484646900086 ()2-s2.0-85069568922 (Scopus ID)
Anmärkning

QC 20191010

Tillgänglig från: 2019-10-10 Skapad: 2019-10-10 Senast uppdaterad: 2019-10-16Bibliografiskt granskad
Zanao, M., Colodette, J. L., Oliveira, R. C., Almeida, D. P., Gomes, F. J. B. & de Carvalho, D. M. (2019). Evaluation of Kraft-PS Cooking for Eucalypt and Pine Wood Chip Mixtures. Journal of wood chemistry and technology, 39(3), 149-165
Öppna denna publikation i ny flik eller fönster >>Evaluation of Kraft-PS Cooking for Eucalypt and Pine Wood Chip Mixtures
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2019 (Engelska)Ingår i: Journal of wood chemistry and technology, ISSN 0277-3813, E-ISSN 1532-2319, Vol. 39, nr 3, s. 149-165Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The purpose of this study was evaluating polysulfides (PS) as additives in kraft cooking of wood mixtures eucalypt (E) and pine chips (P) wood mixtures, namely: 50E/50P, 70E/30P, and 90E/10P. Bleaching (O(D/A)(EP)D) and refining of pulps were also investigated. The PS addition (1.5 or 3.0%) to the kraft cooking preserved the hemicelluloses resulting increased pulp yield and reduced H-factor. The oxygen delignification was more efficient for chip mixtures containing higher proportion of pine chips, but was not largely affected by the addition of PS. The bleach chemical consumption was not significantly influenced by PS dosage or by the wood chip mixture. The burst and tear indexes were improved by increasing the proportion of pine chips to the mixture, but an opposite effect was observed for refinability, tensile index, and opacity. The kraft-PS pulps showed increased refinability, tensile, and burst strengths in relation the standard pulps, but lower opacities.

Ort, förlag, år, upplaga, sidor
TAYLOR & FRANCIS INC, 2019
Nyckelord
Eucalypt, pine, polysulfides charge, pulp chemistry, pulp strength
Nationell ämneskategori
Kemi
Identifikatorer
urn:nbn:se:kth:diva-252616 (URN)10.1080/02773813.2018.1533979 (DOI)000467859800001 ()2-s2.0-85058788205 (Scopus ID)
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QC 20190603

Tillgänglig från: 2019-06-03 Skapad: 2019-06-03 Senast uppdaterad: 2019-06-03Bibliografiskt granskad
de Carvalho, D. M., Moser, C., Lindström, M. & Sevastyanova, O. (2019). Impact of the chemical composition of cellulosic materials on the nanofibrillation process and nanopaper properties. Industrial crops and products (Print), 127, 203-211
Öppna denna publikation i ny flik eller fönster >>Impact of the chemical composition of cellulosic materials on the nanofibrillation process and nanopaper properties
2019 (Engelska)Ingår i: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 127, s. 203-211Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This paper investigated the impact of the amounts of lignin and hemicelluloses on cellulose nanofibers (CNFs). Birch and spruce wood were used to prepare holocellulose and cellulose samples by classical methods. To better assess the effect of the chemical composition on the CNF performance and simplify the process for CNF preparation, no surface derivatization method was applied for CNF preparation. Increased amounts of hemicelluloses, especially mannans, improved the defibration process, the stability of the CNFs and the mechanical properties, whereas the residual lignin content had no significant effect on these factors. On the other hand, high lignin content turned spruce nanopapers yellowish and, together with hemicelluloses, reduced the strain-at-break values. Finally, when no surface derivatization was applied to holocellulose and cellulose samples before defibration, the controlled preservation of residual lignin and hemicelluloses on the CNFs indicate to be crucial for the process. This simplified method of CNF preparation presents great potential for forest-based industries as a way to use forestry waste (e.g., branches, stumps, and sawdust) to produce CNFs and, consequently, diversify the product range and reach new markets.

Ort, förlag, år, upplaga, sidor
Elsevier, 2019
Nyckelord
Birch wood, Spruce wood, Cellulose nanofiber (CNF), Holocellulose CNF, Nanopaper, Residual cell wall components
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-238861 (URN)10.1016/j.indcrop.2018.10.052 (DOI)000452565200025 ()2-s2.0-85055735243 (Scopus ID)
Anmärkning

QC 20181120

Tillgänglig från: 2018-11-13 Skapad: 2018-11-13 Senast uppdaterad: 2019-01-04Bibliografiskt granskad
de Carvalho, D. M., Moser, C., Lindström, M. & Sevastyanova, O. (2019). Preparation of cellulosic samples with varied content of residual lignin and hemicelluloses: Impact on nanofibrillation process and nanopaper properties. Paper presented at National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL. Abstracts of Papers of the American Chemical Society, 257
Öppna denna publikation i ny flik eller fönster >>Preparation of cellulosic samples with varied content of residual lignin and hemicelluloses: Impact on nanofibrillation process and nanopaper properties
2019 (Engelska)Ingår i: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 257Artikel i tidskrift, Meeting abstract (Övrigt vetenskapligt) Published
Ort, förlag, år, upplaga, sidor
AMER CHEMICAL SOC, 2019
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-257611 (URN)000478860502474 ()
Konferens
National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL
Anmärkning

QC 20190918

Tillgänglig från: 2019-09-18 Skapad: 2019-09-18 Senast uppdaterad: 2019-09-18Bibliografiskt granskad
de Souza, G. B., Colodette, J. L., Borges Gomes, F. J. & de Carvalho, D. M. (2018). Enhancement of eucalypt pulp yield through extended impregnation cooking. Nordic Pulp & Paper Research Journal, 33(2), 175-185
Öppna denna publikation i ny flik eller fönster >>Enhancement of eucalypt pulp yield through extended impregnation cooking
2018 (Engelska)Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, nr 2, s. 175-185Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The improvement caused by eucalypt chip impregnation on kraft pulping performance was assessed for terminating the cook at kappa in the range of 15-27 and at controlled residual effective alkali (REA) of 6-8 g/L NaOH. Extended impregnation cooking of eucalypt chips (EIC) increased about 10/0 lignin- and HexA-free screen yield gains in relation to conventional cooking (CC), regardless of kappa number in the range of 15-27. The EIC technology allows for cooking eucalypt wood to kappa number up to 27, without rejects production, but without significant improvement in lignin- and HexA-free screen yield and with larger chlorine dioxide (ClO2) consume during bleaching. The optimum kappa number for both CC and EIC cooking was about 19 with similar refinability and strength properties for both technologies, CC and EIC. It was concluded that extended impregnation cooking is an attractive technique for enhancing bleached eucalypt Kraft pulp yield.

Ort, förlag, år, upplaga, sidor
AB SVENSK PAPPERSTIDNING, 2018
Nyckelord
controlled residual effective alkali (REA), conventional cooking (CC), extended impregnation cooking (EIC), lignin- and HexA-free screen yield
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:kth:diva-240028 (URN)10.1515/npprj-2018-3032 (DOI)000450922400002 ()2-s2.0-85050166587 (Scopus ID)
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QC 20181210

Tillgänglig från: 2018-12-10 Skapad: 2018-12-10 Senast uppdaterad: 2018-12-10Bibliografiskt granskad
de Carvalho, D. M., de Queiroz, J. H. & Colodette, J. L. (2017). Hydrothermal and Acid Pretreatments Improve Ethanol Production from Lignocellulosic Biomasses. BioResources, 12(2), 3088-3107
Öppna denna publikation i ny flik eller fönster >>Hydrothermal and Acid Pretreatments Improve Ethanol Production from Lignocellulosic Biomasses
2017 (Engelska)Ingår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 12, nr 2, s. 3088-3107Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Hydrothermal and acid pretreatments using different acid charges (1.5%, 3.0%, and 4.5% H2SO4) were proposed for eucalyptus, sugarcane bagasse, and sugarcane straw prior to their bioconversion into ethanol using the semi-simultaneous saccharification and fermentation (SSSF) process. The hydrothermal and acid pretreatments were efficient for hemicelluloses removal from eucalyptus (63 to 96%), bagasse (25 to 98%), and straw (23 to 95%) and to remove a substantial amount of lignin from eucalyptus (10 to 34%) and bagasse (10 to 27%). During pretreatments, pseudo-extractives and pseudo-lignin were generated from biomasses. The SSSF was performed in pretreated biomasses using 24 h presaccharification followed by an additional 10 h of simultaneous saccharification and fermentation (SSF). With hydrothermal pretreatment, the eucalyptus presented the highest ethanol production, but only low values for SSSF parameters were obtained, as follows: ethanol yield (0.017 g(ethanol)/g(biomass)), volumetric productivity of ethanol (0.16 g L-1 h(-1)), and ethanol concentration (1.6 g L-1). On the other hand, using acid pretreatment, the straw (pretreated using 4.5% H2SO4) presented the highest ethanol production among the biomasses, assessed based on ethanol yield (0.056 g(ethanol)/g(biomass)), volumetric productivity of ethanol (0.51 g L-1 h(-1)), and ethanol concentration (5.1 g L-1).

Ort, förlag, år, upplaga, sidor
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI, 2017
Nyckelord
Acid pretreatment, Eucalyptus wood, Hydrothermal pretreatment, Semi-simultaneous saccharification and fermentation (SSSF), Sugarcane bagasse, Sugarcane straw
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-210402 (URN)10.15376/biores.12.2.3088-3107 (DOI)000402883700063 ()2-s2.0-85018904996 (Scopus ID)
Anmärkning

QC 20170704

Tillgänglig från: 2017-07-04 Skapad: 2017-07-04 Senast uppdaterad: 2018-06-19Bibliografiskt granskad
de Carvalho, D. M., Martinez-Abad, A., Colodette, J. L., Lindström, M., Vilaplana, F. & Sevastyanova, O. (2016). Chemical and structural characterization of xylans from sugarcane bagasse and sugarcane straw. Abstract of Papers of the American Chemical Society, 251
Öppna denna publikation i ny flik eller fönster >>Chemical and structural characterization of xylans from sugarcane bagasse and sugarcane straw
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2016 (Engelska)Ingår i: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 251Artikel i tidskrift, Meeting abstract (Övrigt vetenskapligt) Published
Ort, förlag, år, upplaga, sidor
AMER CHEMICAL SOC, 2016
Nationell ämneskategori
Organisk kemi
Identifikatorer
urn:nbn:se:kth:diva-242670 (URN)000431903801576 ()
Anmärkning

QC 20190222

Tillgänglig från: 2019-02-22 Skapad: 2019-02-22 Senast uppdaterad: 2019-02-22Bibliografiskt granskad
Berglund, J., Farahani, S. K., de Carvalho, D. M., Lawoko, M., Wohlert, J., Henriksson, G., . . . Vilaplana, F.The influence of acetylation and sugar composition on the (in)solubility of mannans, their interaction with cellulose surfaces and thermal properties.
Öppna denna publikation i ny flik eller fönster >>The influence of acetylation and sugar composition on the (in)solubility of mannans, their interaction with cellulose surfaces and thermal properties
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(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:kth:diva-251378 (URN)
Anmärkning

QC 20190514

Tillgänglig från: 2019-05-13 Skapad: 2019-05-13 Senast uppdaterad: 2019-05-14Bibliografiskt granskad
Berglund, J., Kishani, S., de Carvalho, D. M., Lawoko, M., Wohlert, J., Henriksson, G., . . . Vilaplana, F.The influence of acetylation and sugar composition on the (in)solubility of mannans, their interaction with cellulose surfaces and thermal properties..
Öppna denna publikation i ny flik eller fönster >>The influence of acetylation and sugar composition on the (in)solubility of mannans, their interaction with cellulose surfaces and thermal properties.
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(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-240496 (URN)
Anmärkning

QC 20190108

Tillgänglig från: 2018-12-19 Skapad: 2018-12-19 Senast uppdaterad: 2019-05-09Bibliografiskt granskad
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