Cationized Lignin Loaded Alginate Beads for Efficient Cr(VI)
                    Removal

KIM, Jungkyu; KIM, YunJin; JUNG, Seungoh; YUN, Heecheol; YEO, Hwanmyeong; CHOI, In-Gyu; KWAK, Hyo Won

doi:10.5658/wood.2023.51.5.321

J. Korean Wood Sci. Technol.

2023

DOI: 10.5658/wood.2023.51.5.321

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Cationized Lignin Loaded Alginate Beads for Efficient Cr(VI) Removal

Jungkyu KIM,

YunJin KIM,

Seungoh JUNG

et al.

Abstract: In this study, lignin, a lignocellulosic biomass, was chemically modified to produce polyethyleneimine-grafted lignin (PKL) with maximum hexavalent chromium [Cr(VI)] adsorption capacity. Changes in the physicochemical properties due to the cationization of lignin were confirmed through elemental analysis, Fourier transform infrared spectroscopy, and moisture stability evaluation. Alginate (Alg) beads containing PKL (Alg/PKL) were prepared by incorporating cationic lignin into the Alg matrix to apply the prepar… Show more

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2024

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Cited by 2 publications

References 30 publications

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Fixed Bed Drying of Sugarcane Bagasse Using Solar Energy

LEE,

KIM,

LEE

et al. 2024

J. Korean Wood Sci. Technol.

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Solar energy is one of the most promising options for renewable energy and biomass is one of them. One of the main biomass sources, sugarcane bagasse, is produced annually in more than hundreds of nations worldwide exceeding 4.25 billion tons. To dry a 900-mm deep fixed bed of wet sugarcane bagasse, a solar air heater with a collector area of 2 m 2 was installed. Between October 10 th to 19 th in Gwangju, South Korea, a 9-day drying period, the solar collector received a total of 496,145 kJ of solar radiation. During this time, 54.5 kg of water was extracted from 133 kg of wet sugarcane bagasse (average green moisture content of 47.6%w.b.). The estimated net heat from the evaporation of water removed during the dying period accounted for approximately 27% of the total solar radiation on the solar collector.

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Fixed Bed Drying of Sugarcane Bagasse Using Solar Energy

LEE,

KIM,

LEE

et al. 2024

J. Korean Wood Sci. Technol.

View full text Add to dashboard Cite

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Effect of Ethanol Fractionation of Lignin on the Physicochemical Properties of Lignin-Based Polyurethane Film

WON,

BANG,

PARK

et al. 2024

J. Korean Wood Sci. Technol.

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Lignin, a prominent constituent of woody biomass, is abundant in nature, cost-effective, and contains various functional groups, including hydroxyl groups. Owing to these characteristics, they have the potential to replace petroleum-based polyols in the polyurethane industry, offering a solution to environmental problems linked to resource depletion and CO2 emissions. However, the structural complexity and low reactivity of lignin present challenges for its direct application in polyurethane materials. In this study, Kraft lignin (KL), a representative technical lignin, was fractionated with ethanol, an eco-friendly solvent, and mixed with conventional polyols in varying proportions to produce polyurethane films. The results of ethanol fractionation showed that the polydispersity of ethanol-soluble lignin (ESL) decreased from 3.71 to 2.72 and the hydroxyl content of ESL increased from 4.20 mmol/g to 5.49 mmol/g. Consequently, the polyurethane prepared by adding ESL was superior to the KL-based film, exhibiting improved miscibility with petrochemical-based polyols and reactivity with isocyanate groups. Consequently, the films using ESL as the polyol exhibited reduced shrinkage and a more uniform structure. Optical microscope and scanning electron microscope observations confirmed that lignin aggregation was lower in polyurethane with ESL than in that with KL. When the hydrophobicity of the samples was measured using the water contact angle, the addition of ESL resulted in higher hydrophobicity. In addition, as the amount of ESL added increased, an increase of 7.4% in the residual char was observed, and a 4.04% increase in Tmax the thermal stability of the produced polyurethane was effectively improved.

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Cationized Lignin Loaded Alginate Beads for Efficient Cr(VI) Removal

Cited by 2 publications

References 30 publications

Fixed Bed Drying of Sugarcane Bagasse Using Solar Energy

Fixed Bed Drying of Sugarcane Bagasse Using Solar Energy

Effect of Ethanol Fractionation of Lignin on the Physicochemical Properties of Lignin-Based Polyurethane Film

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