Preparation and Characterisation of Cellulose by Delignification of Eteng (Ceiba pentandra) Wood in Formic Acid-Acetic Acid-Water Solvent Mixtures

Assonfack, Herman Lekane; Cheumani, Arnaud Maxime Yona; Ndinteh, Derek Tantoh; Lembe, Jordan Tonga; Nga, Josiane Bertille; Ndikontar, Maurice Kor

doi:10.1007/s10924-022-02641-9

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…The cellulose pulp and oxidized celluloses exhibit two stages of weight loss in the TGA curve. The rst mass loss occurs between 50°C and 110°C and is due to the evaporation of weakly-bound moisture from the surface of the materials (Assonfack et al 2022). The second mass loss starts at around 300°C for cellulose pulp and the maximum degradation is observed at 350°C revealed by the DTG curve.…”

Section: Thermogravimetric Analysesmentioning

confidence: 99%

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Study of oxidation of cellulose by Fenton-type reactions using alkali metal salts as swelling agents

Tsague,

Chimeni,

Assonfack

et al. 2023

Preprint

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Cellulose from corn straw was oxidized by Fenton-type reagents (FeSO4. 7H2O or CuCl2. 2H2O) using alkaline metal salts (LiCl; NaCl). Cellulose pre-treatment using alkali metal salts (LiCl; NaCl) coupled with a high H2O2 loading (up to 500 kg per ton of pulp) are used as a novel approach to improve the oxidation rate of oxidized celluloses. The oxidation rate was determined by measuring the aldehyde and carboxylic acid contents of the oxidized cellulose. The oxidized celluloses were characterized by Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR), X-ray diffraction (XRD) and thermogravimetric analyses (TGA). The results show that the oxidation efficiency was improved by using the metal salts and increasing the H2O2 loading for both catalytic systems (Fe2+ or Cu2+). The oxidization rate increased gradually with H2O2 loading up to a maximum 500 kg/t of pulp tested without a considerable loss of cellulose structure. The FTIR results revealed that oxidized celluloses exhibit almost similar predominant hydroxyl-based structure as native cellulose with the presence of bands in the regions of 1640-1742 cm-1 characteristic of aldehyde and carboxylic acid groups. The XRD results showed that the crystallinity index slightly decreased from 69.4 to 67-68 and 62-64% after oxidation of the cellulose. The equilibrium moisture contents of oxidized celluloses increased compared to the raw cellulose pulp. The moisture curves fit the page model and exhibits a sub-diffusion process.

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Section: Thermogravimetric Analysesmentioning

confidence: 99%

“…Assonfack et al 2022). Like for cellulose pulp, oxidized celluloses also show two DTG degradation peaks.…”

mentioning

confidence: 99%

Study of oxidation of cellulose by Fenton-type reactions using alkali metal salts as swelling agents

Tsague,

Chimeni,

Assonfack

et al. 2023

Preprint

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“…Recently, there is an increasing interest in the use of low boiling carboxylic acid mixtures, such as acetic acid or formic acid, as organic solvents for the organosolv delignification process, since this technology can operate at relatively low temperatures and pressures [ 19 ]. On the one hand, the use of water/carboxylic acid mixtures has been studied.…”

Section: Introductionmentioning

confidence: 99%

Integral Valorization of Posidonia oceanica Balls: An Abundant and Potential Biomass

Mnafki,

Morales,

Sillero

et al. 2024

Polymers

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Posidonia oceanica balls (POB), a kind of seagrass, are a significant environmental issue since they are annually discharged onto beaches. Their current usefulness limits interest in their management and enhances the environmental problem. Therefore, in this research, the potential of this lignocellulosic biomass was studied from a holistic biorefinery point of view. To this end, an in-depth study was carried out to select the best pathway for the integral valorization of POBs. First, an autohydrolysis process was studied for the recovery of oligosaccharides. Then, a delignification stage was applied, where, in addition to studying different delignification methods, the influence of the autohydrolysis pre-treatment was also investigated. Finally, cellulose nanofibers (CNFs) were obtained through a chemo-mechanical treatment. The results showed that autohydrolysis not only improved the delignification process and its products, but also allowed the hemicelluloses to be valorized. Acetoformosolv delignification proved to be the most successful in terms of lignin and cellulose properties. However, alkaline delignification was able to extract the highest amount of lignin with low purity. CNFs were also successfully produced from bleached solids. Therefore, the potential of POB as a feedstock for a biorefinery was confirmed, and the pathway should be chosen according to the requirements of the desired end products.

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Study of oxidation of cellulose by Fenton-type reactions using alkali metal salts as swelling agents

Tsague,

Chimeni,

Assonfack

et al. 2024

Cellulose

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Preparation and Characterisation of Cellulose by Delignification of Eteng (Ceiba pentandra) Wood in Formic Acid-Acetic Acid-Water Solvent Mixtures

Cited by 3 publications

References 37 publications

Study of oxidation of cellulose by Fenton-type reactions using alkali metal salts as swelling agents

Study of oxidation of cellulose by Fenton-type reactions using alkali metal salts as swelling agents

Integral Valorization of Posidonia oceanica Balls: An Abundant and Potential Biomass

Study of oxidation of cellulose by Fenton-type reactions using alkali metal salts as swelling agents

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