Special Issue "Green Chemistry and Biofinery Concepts on Biomass Valorisation"

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Sustainable Chemical Engineering and Technology".

Deadline for manuscript submissions: 28 February 2022.

Special Issue Editor

Dr. André M. Da Costa Lopes
E-Mail Website
Guest Editor
1. CICECO, Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
2. CECOLAB - Collaborative Laboratory Towards Circular Economy, R. Nossa Senhora da Conceição, 3405-155 Oliveira do Hospital, Portugal
Interests: Research and development of green and sustainable technologies for the valorisation of different types of biomass using alternative solvents (e.g., ionic liquids, deep eutectic solvents, supercritical carbon dioxide, among others) towards the integration in biorefineries.
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Special Issue Information

Dear Colleagues,

One of the utmost challenges of society is to move from a non-renewable and polluting fossil-based economy to a more sustainable model of economic development. To cover such a demand, circular economy and bioeconomy have been implemented to encourage the use and reuse of renewable resources, such as biomass feedstocks. However, conventional biomass processing and converting technologies still face some bottlenecks, such as lack of efficiency and selectivity, difficult downstreaming, undesired side reactions and equipment corrosion, which compromises full and economical biomass valorisation. Therefore, a biorefinery concept that predicts the utilization of biomass in different processing platforms towards the production of energy, fuels, materials and chemicals must be employed analogous to a petroleum refinery. In addition, this activity must also be guided by green chemistry principles, which contemplate good practises in chemistry processing to achieve low impacts on the environment and public health. Otherwise, no significant benefit is gained from biomass in contrast to non-renewable feedstocks.

In this context, this Special Issue, entitled as “Green Chemistry and Biorefinery Concepts on Biomass Valorisation” aims at gathering cutting-edge studies and innovative technologies on the entire biomass processing value chain assisted by green chemistry tools (e.g., ionic liquids, deep eutectic solvents, supercritical fluids, green catalysts and reagents) with potential to be integrated into biorefinery platforms. Authors are encouraged to submit their contributions in different hot topics as follows:

  • Extraction of value-added compounds from biomass using green technologies;
  • Application of green solvents on biomass pre-treatment and fractionation;
  • Enzymatic hydrolysis of biomass components in green solvents;
  • Lignin depolymerization into aromatics through the application of green catalysts and solvents;
  • Catalytic conversion of sugars into platform chemicals (aromatics, organic acids, furans, etc.) with green approaches;
  • Cellulose and lignin application in novel materials using green chemistry approaches;
  • Fermentation of sugar-based streams into biofuels and biochemicals;
  • Conversion of fat-based biomass or oil streams assisted by green catalysts towards the production of biodiesel and jet fuels;
  • Extraction and valorisation of protein-based streams with green solvents and catalysts;
  • Downstream processing focused on the recycling of green solvents and catalysts as well as on the purification of produced biofuels, biomaterials and biochemicals.

You may choose our Joint Special Issue in Sustainable Chemistry.

Dr. André M. Da Costa Lopes
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • green solvents
  • green catalysts
  • biorefinery
  • biomass pretreatment and fractionation
  • catalytic conversion
  • depolymerization
  • cellulose
  • hemicellulose
  • lignin
  • biofuels
  • biomaterials
  • platform chemicals
  • fermentation
  • downstream processing
  • solvent and catalyst recycling
  • purification methods

Published Papers (2 papers)

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Research

Article
Valorization of Spent Coffee by Caffeine Extraction Using Aqueous Solutions of Cholinium-Based Ionic Liquids
Sustainability 2021, 13(13), 7509; https://doi.org/10.3390/su13137509 - 05 Jul 2021
Viewed by 659
Abstract
Spent coffee grounds (SCGs) are a waste product with no relevant commercial value. However, SCGs are rich in extractable compounds with biological activity. To add value to this coffee byproduct, water and aqueous solutions of cholinium-based ionic liquids (ILs) were studied to extract [...] Read more.
Spent coffee grounds (SCGs) are a waste product with no relevant commercial value. However, SCGs are rich in extractable compounds with biological activity. To add value to this coffee byproduct, water and aqueous solutions of cholinium-based ionic liquids (ILs) were studied to extract caffeine from SCGs. In general, all IL aqueous solutions lead to higher extraction efficiencies of caffeine than pure water, with aqueous solutions of cholinium bicarbonate being the most efficient. A factorial planning was applied to optimize operational conditions. Aqueous solutions of cholinium bicarbonate, at a temperature of 80 °C for 30 min of extraction, a biomass–solvent weight ratio of 0.05 and at an IL concentration of 1.5 M, made it possible to extract 3.29 wt% of caffeine (against 1.50 wt% obtained at the best conditions obtained with pure water). Furthermore, to improve the sustainability of the process, the same IL aqueous solution was consecutively applied to extract caffeine from six samples of fresh biomass, where an increase in the extraction yield from 3.29 to 13.10 wt% was achieved. Finally, the cholinium bicarbonate was converted to cholinium chloride by titration with hydrochloric acid envisioning the direct application of the IL-caffeine extract in food, cosmetic and nutraceutical products. The results obtained prove that aqueous solutions of cholinium-based ILs are improved solvents for the extraction of caffeine from SCGs, paving the way for their use in the valorization of other waste rich in high-value compounds. Full article
(This article belongs to the Special Issue Green Chemistry and Biofinery Concepts on Biomass Valorisation)
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Article
Fast and Efficient Method to Evaluate the Potential of Eutectic Solvents to Dissolve Lignocellulosic Components
Sustainability 2020, 12(8), 3358; https://doi.org/10.3390/su12083358 - 20 Apr 2020
Cited by 3 | Viewed by 1242
Abstract
The application of eutectic solvents (ESs) in lignocellulosic biomass fractionation has been demonstrated as a promising approach to accomplish efficient and environmentally friendly biomass valorization. In general, ESs are a combination of two components, a hydrogen-bonding donor and a hydrogen-bonding acceptor, in which [...] Read more.
The application of eutectic solvents (ESs) in lignocellulosic biomass fractionation has been demonstrated as a promising approach to accomplish efficient and environmentally friendly biomass valorization. In general, ESs are a combination of two components, a hydrogen-bonding donor and a hydrogen-bonding acceptor, in which the melting point of the mixture is lower than that of the individual components. However, there are plenty of possible combinations to form ESs with the potential to apply in biomass processing. Therefore, the development of fast and effective screening methods to find combinations capable to dissolve the main biomass components—namely cellulose, hemicelluloses, and lignin—is highly required. An accurate and simple technique based on optical microscopy with or without polarized lenses was used in this study to quickly screen and monitor the dissolution of cellulose, xylose (a monomer of hemicelluloses), and lignin in several ESs. The dissolution of these solutes were investigated in different choline-chloride-based ESs (ChCl:UREA, ChCl:PROP, ChCl:EtGLY, ChCl:OXA, ChCl:GLY, ChCl:LAC). Small amounts of solute and solvent with temperature control were applied and the dissolution process was monitored in real time. The results obtained in this study showed that cellulose was insoluble in these ESs, while lignin and xylose were progressively dissolved. Full article
(This article belongs to the Special Issue Green Chemistry and Biofinery Concepts on Biomass Valorisation)
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