February 2025
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22 Reads
Chemical Engineering Journal
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February 2025
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22 Reads
Chemical Engineering Journal
December 2024
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35 Reads
International Journal of Biological Macromolecules
November 2024
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31 Reads
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2 Citations
Bioresource Technology
November 2024
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45 Reads
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8 Citations
Industrial Crops and Products
November 2024
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28 Reads
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1 Citation
Journal of Colloid and Interface Science
September 2024
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96 Reads
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3 Citations
Dye pollution in wastewater is a persistent environmental challenge, with synthetic dyes posing significant threats to aquatic ecosystems and human health. This review article examines the potential of cellulose-based aerogels as a sustainable solution for removing dyes from wastewater. Cellulose aerogels, owing to their high porosity, large surface area, and tailorable surface chemistry, have emerged as promising adsorbent materials for dye remediation. The review outlines the sources and classification of dyes, highlighting their environmental and health implications. It then provides a comprehensive overview of various dye removal methodologies, critically analyzing their advantages and limitations and underscoring the need for effective and sustainable treatment technologies. The preparation of cellulose aerogels, including natural, regenerated, and cellulose derivative variants, is discussed, along with surface modification strategies to enhance their dye adsorption capabilities. Detailed characterization techniques and the assessment of dye removal performance are also covered. The review concludes by synthesizing the key findings and outlining recommendations for future research, such as developing innovative cellulose aerogel formulations, conducting life-cycle assessments, and fostering collaborative efforts to accelerate the adoption of these technologies in wastewater treatment applications. This review aims to contribute to the advancement of sustainable and efficient dye removal solutions using cellulose-based aerogels.
September 2024
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42 Reads
Energy Conversion and Management
Acid-catalyzed glycerol organosolv (GO) pretreatment is a promising method for lignocellulosic biomass (LCB) fractionation. However, this method often leads to lignin repolymerization, intensifying lignin's inhibitory effects on subsequent enzymatic hydrolysis and limiting the production of highly active lignin, thereby hindering its valorization. This study explored incorporating polyethylene glycol (PEG) into acidic-catalyzed GO to improve bioethanol and bio-oil yields, with a focus on improving the yield of light aromatics, from LCB. Optimized PEG-aided GO pretreatment achieved a significantly higher bioethanol yield (23.7 g/L) compared to GO (17 g/L) and dilute acid (DA: 11.3 g/L) pretreatments. This improvement is attributed to the ability of PEG to mitigate lignin inhibition and modify the physicochemical properties of the pretreated substrate. Furthermore, thermal pyrolysis of PEG-aided GO lignin, obtained after the fermentation process, resulted in a substantially increased bio-oil yield (45.5 %) compared to GO (19 %) and DA (12 %). The enhanced bio-oil yield from PEG-aided GO lignin is ascribed to the promotion of β-O-4 linkages and the formation of β-O-4′ linkages. Characterization of the pyrolysis bio-oil revealed that light aromatic compounds were the dominant fraction, with their relative abundance significantly increasing from DA (5.9 %) to GO (9.7 %) and PEG-aided GO lignin (24.9 %). The PEG-aided GO method achieved an energy output of 8.85 MJ/kg, exceeding that of the GO and DA methods by 31 % and 57 %, respectively. The energy conversion efficiency of the PEG-aided GO method was 70 %, demonstrating a significant improvement compared to GO (57 %) and DA (51 %). This approach promotes the circular economy by upcycling LCB for bioethanol and valuable light aromatic compound production.
September 2024
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34 Reads
Energy
August 2024
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193 Reads
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3 Citations
Green Chemistry
Alkaline-catalyzed organosolv pretreatment of lignocellulosic biomass affords excellent delignification, yielding a holocellulose-rich substrate for fermentable sugar production.
August 2024
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35 Reads
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3 Citations
Fuel
This study presents an innovative cascade biorefinery process that efficiently converts furfural residues (FRs) into valuable bioethanol and pyrolytic oil. Two pretreatment methods, acetic acid/glycerol (R1) and sulfuric acid/glycerol (R2), were applied to fractionate FRs biomass. Optimized pretreatment conditions increased the cellulose accessibility of FRs, enhancing porosity by 0.98–1.55 times and crystallinity by 0.99–1.27 times. Notably, maximum bioethanol titers of 27.8 and 26.5 g/L were achieved with R1 and R2, respectively, after cellulose hydrolysis of pretreated FRs. Pyrolyzing the residual lignin obtained after the enzymatic hydrolysis of pretreated FRs by R1 and R2 resulted in a bio-oil yield of 28.3 % and 27.9 %, respectively. Interestingly, the energy outputs obtained from the respective methods were 10.5 and 9.6 MJ/kg, exceeding the direct pyrolysis of raw FRs (7.0 MJ/kg). The energy conversion efficiencies obtained from the respective integrated routes were 51.3 % and 47.0 %, higher than that from the direct pyrolysis of raw FRs (34.3 %). This approach can effectively promote the circular economy concept in the manufacturing sector by valorizing and upcycling FRs for bio-oil and bioethanol production.
... The adoption of eco-friendly and cost-efficient raw materials, alongside the development of novel manufacturing techniques, is essential for improving the practical viability of aerogels. These advancements are instrumental in reducing the ecological footprint of aerogel production and in making these materials more accessible for broader industrial applications [242,243]. ...
September 2024
... The global pursuit in sustainable management of water and energy resources has received increasing interest in recent years due to increasing human activities such as urbanization, agriculture, and industry, impacting both the quantity and quality of available freshwater [1]. Therefore, developing sustainable waste-to-resources biotechnologies is critical for addressing these issues. ...
August 2024
Fuel
... The Fenton-based treatment system, which uses hydrogen peroxide and iron catalysts, generates hydroxyl radicals that effectively degrade lignin and hemicellulose [38]. Additionally, surfactant-assisted methodologies, which involve adding surfactants, can increase enzyme accessibility to the biomass by reducing surface tension and disrupting the structure of lignocellulosic materials [39]. Such approaches have been designed to break down the lignocellulose structure to enhance enzyme accessibility. ...
January 2024
Bioresource Technology
... The solid residue rich in cellulose and lignin is subjected to enzymatic hydrolysis process where cellulose is converted to fermentable sugars. As lignin acts as inhibitor to the yeast or microorganism used during the fermentation process, it is separated as byproduct in the form of solid residue before the fermentation process while the liquid solution containing fermentable sugars is subjected to fermentation for cellulose based products including ethanol, lactic acid and sorbitol [5][6][7]. Due to rapidly increasing biofuel production, biorefineries are facing economic challenges owing to not only high cost of enzymes used for hydrolysis [8], but also inefficient utilization of the large quantity of hydrolysis lignin produced. Currently, the majority of hydrolysis lignin is used as low value alternative fuel for industrial boilers resulting in massive CO 2 release into environment [9]. ...
January 2024
Fuel
... The solid residue rich in cellulose and lignin is subjected to enzymatic hydrolysis process where cellulose is converted to fermentable sugars. As lignin acts as inhibitor to the yeast or microorganism used during the fermentation process, it is separated as byproduct in the form of solid residue before the fermentation process while the liquid solution containing fermentable sugars is subjected to fermentation for cellulose based products including ethanol, lactic acid and sorbitol [5][6][7]. Due to rapidly increasing biofuel production, biorefineries are facing economic challenges owing to not only high cost of enzymes used for hydrolysis [8], but also inefficient utilization of the large quantity of hydrolysis lignin produced. Currently, the majority of hydrolysis lignin is used as low value alternative fuel for industrial boilers resulting in massive CO 2 release into environment [9]. ...
February 2024
Chemical Engineering Journal
... LCA analyses show that furfural has a lower carbon footprint compared to petrochemical-derived chemicals. Its production can reduce greenhouse gas emissions when derived from sustainably sourced biomass (Leroy-Parmentier et al., 2024;Khounani et al., 2023). While furfural from lignocellulosic biomass offers a more sustainable alternative to petrochemicals, there are trade-offs. ...
November 2023
Industrial Crops and Products
... The by-products from woodworking, forestry, agriculture, and fermentation industries were once considered as wastes. Recent research has shown that lignocellulose derived from these agricultural and forestry wastes can be regarded as a promising resource for sustainable energy production (Lynd et al. 2008;Gao et al. 2022;Kondaveeti et al. 2022;Chen et al. 2023;Kaur et al. 2023;Madadi et al. 2023;Shrivastava and Sharma 2023). However, the first step to effectively utilize lignocellulose is to remove lignin, which hinders cellulose saccharification (Gaikwad and Meshram 2020;Govil et al. 2022;Jindal et al. 2023). ...
August 2023
Renewable and Sustainable Energy Reviews
... It should be noted that corn production started in the early 1980s in the USA, aiming to revive the agricultural section when there was an oversupply of agricultural production. In that time, the key target of the corn production was bioethanol or biofuel production, but currently there are serious concerns for the first-generation feedstocks (Kiehbadroudinezhad et al., 2023a). This is while the secondgeneration feedstock is found in significant amounts in different parts of America (Fig. 6). ...
July 2023
The Science of The Total Environment
... It was reported that a layer of spherical pseudo-lignin droplets would be generated on the pretreated substrates and impede the efficiency of enzymatic digestibility [48]. Fermentative inhibitors may bind tightly with the amino acid residues of the cellulase enzymes as how they hinder the fermentation and metabolism of yeast and bacteria [13,32]. It is not clear whether the mechanism of the prehydrolysate inhibition on the enzymatic hydrolysis stays the same with that on the fermentation of the microorganism. ...
January 2023
Green Chemistry
... These findings emphasize the critical role of protective agents in improving both the yield and product distribution, which has been a limitation in earlier methods. Overall, the incorporation of protective agents during lignin pretreatment holds promise for enhancing depolymerization product yields by inhibiting intermolecular condensation [20,21]. ...
June 2023
Bioresource Technology