Hydrothermal Treatment in Biomass

A special issue of Biomass (ISSN 2673-8783).

Deadline for manuscript submissions: closed (20 November 2023) | Viewed by 4278

Special Issue Editor


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Guest Editor
Department of Chemical Engineering, Louisiana Tech University, 818 Nelson Ave., P.O. Box 10157, Ruston, LA 71272, USA
Interests: biomass; waste; deep eutectic solvents

Special Issue Information

Dear Colleagues,

As a sustainable and renewable resource, all types of biomass have great potential for conversion to biofuels and bioproducts. Preparing biomass for transformation to products requires initial treatment. Using environmentally friendly biomass treatments is important to global health. Hydrothermal treatment uses water as opposed to solvents that are volatile organic compounds, making the process biofriendly. Creating new hydrothermal treatments and optimizing these treatments for different kinds of biomass is essential for biomass use as a resource. This Special Issue will showcase the various means, mechanisms, and optimization of different biomass hydrothermal treatment.

Dr. Joan G. Lynam
Guest Editor

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Keywords

  • biomass conversion technologies
  • processing optimization
  • environmental protection
  • hydrothermal carbonization
  • hydrothermal liquefaction
  • biomass pretreatment
  • fuel

Published Papers (2 papers)

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Research

13 pages, 2082 KiB  
Article
Sugar Extraction from Secondary Agricultural Waste Biomass Using Hydrothermal Carbonization and Direct Contact Membrane Distillation
by Viral Sagar, Joan G. Lynam and Amelia G. Parrenin
Biomass 2023, 3(4), 323-335; https://doi.org/10.3390/biomass3040020 - 07 Oct 2023
Viewed by 1534
Abstract
Sustainable and renewable sources of liquid and solid fuels are essential to prevent fossil fuel use from damaging the environment. Secondary agricultural residues, which are already transported to food processing centers, have great potential to be converted into biofuels. The wastes from coffee [...] Read more.
Sustainable and renewable sources of liquid and solid fuels are essential to prevent fossil fuel use from damaging the environment. Secondary agricultural residues, which are already transported to food processing centers, have great potential to be converted into biofuels. The wastes from coffee roasting, sugar production, and rice milling have been investigated using hydrothermal carbonization (HTC) to produce aqueous products containing monosaccharides alongside solid biofuels. These sugar-laden liquid products were characterized after pretreating coffee silverskins, sugarcane bagasse, and rice husks with HTC. They were then concentrated using direct contact membrane distillation (DCMD), a low-energy process that can use waste heat from other biorefinery processes. The higher heating value of the solid products was also characterized by bomb calorimetry. The liquid products from HTC of these wastes from food production were found to contain varying concentrations of glucose, xylose, galactose, and arabinose. DCMD was capable of concentrating the liquid products up to three times their original concentrations. Little difference was found among the higher heating values of the solid products after 180 °C HTC pretreatment compared to 200 °C pretreatment. HTC of waste from food processing can provide solid biofuels and liquid products containing sugars that can be concentrated using DCMD. Full article
(This article belongs to the Special Issue Hydrothermal Treatment in Biomass)
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14 pages, 1704 KiB  
Article
Effect of Synthesis Process, Synthesis Temperature, and Reaction Time on Chemical, Morphological, and Quantum Properties of Carbon Dots Derived from Loblolly Pine
by Thomas Quaid, Vahab Ghalandari and Toufiq Reza
Biomass 2022, 2(4), 250-263; https://doi.org/10.3390/biomass2040017 - 05 Oct 2022
Cited by 6 | Viewed by 2102
Abstract
In this study, carbon dots are synthesized hydrothermally from loblolly pine using top-down and bottom-up processes. The bottom-up process dialyzed carbon dots from hydrothermally treated process liquid. Meanwhile, hydrochar was oxidized into carbon dots in the top-down method. Carbon dots from top-down and [...] Read more.
In this study, carbon dots are synthesized hydrothermally from loblolly pine using top-down and bottom-up processes. The bottom-up process dialyzed carbon dots from hydrothermally treated process liquid. Meanwhile, hydrochar was oxidized into carbon dots in the top-down method. Carbon dots from top-down and bottom-up processes were compared for their yield, size, functionality, and quantum properties. Furthermore, hydrothermal treatment temperature and residence time were evaluated on the aforementioned properties of carbon dots. The results indicate that the top-down method yields higher carbon dots than bottom-up in any given hydrothermal treatment temperature and residence time. The size of the carbon dots decreases with the increase in reaction time; however, the size remains similar with the increase in hydrothermal treatment temperature. Regarding quantum yield, the carbon dots from the top-down method exhibit higher quantum yields than bottom-up carbon dots where the quantum yield reaches as high as 48%. The only exception of the bottom-up method is the carbon dots prepared at a high hydrothermal treatment temperature (i.e., 260 °C), where relatively higher quantum yield (up to 18.1%) was observed for the shorter reaction time. Overall, this study reveals that the properties of lignocellulosic biomass-derived carbon dots differ with the synthesis process as well as the processing parameters. Full article
(This article belongs to the Special Issue Hydrothermal Treatment in Biomass)
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