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Sustainable Development and Application of Biochar: 2nd Edition

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Energy Sustainability".

Deadline for manuscript submissions: 15 August 2026 | Viewed by 311

Special Issue Editors


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Guest Editor
Grupo Vinculado al PROBIEN (CONICET-UNCo), Instituto de Ingeniería Química, Facultad de Ingeniería Universidad Nacional de San Juan, San Juan 5400, Argentina
Interests: bioenergy; circular economy; extraction of value-added product; biorefinery; thermochemical process; kinetics; exergy analysis; biomaterials; industrial ecology; production of platform molecules; municipal solid waste thermal treatments; cuttings from the oil extraction industry
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
1. Facultad de Ingeniería, Universidad Nacional del Comahue, UNCo, Neuquén Q8300, Argentina
2. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, PROBIEN, CONICET-UNCo, Neuquén Q8300, Argentina
Interests: sustainable chemical and energetic valorization of biowastes; municipal solid waste thermal treatments; cuttings from the oil extraction industry; heterogeneous reactors for clean processes; fluidization engineering; modeling; simulation of fluidized beds
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
1. Instituto de Ingeniería Química-Grupo Vinculado al PROBIEN (CONICET-UNCO), Facultad de Ingeniería, Universidad Nacional de San Juan, San Juan C.P. 5400, Argentina
2. Instituto de Biotecnología, Facultad de Ingeniería, Universidad Nacional de San Juan, San Juan C.P. 5400, Argentina
Interests: circular economy; extraction of value-added products; biorefinery; drying; biomaterials; biomimetics synthesis; production of platform molecules
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Biochar is a product that is obtained from the thermochemical transformation of biomass, particularly from bio-waste, which is used in agriculture as an amendment and substrate in soil-less crops. This material is used for obtaining energy, gas cleaning, and wastewater treatment, among other functions. Due to the fact that biochar can be obtained from bio-waste, as well as its innumerable uses to enhance the quality of the environment, it is important to summarize the new advances in this field, since its use contributes to the circular economy, improving the sustainability of production processes.

This Special Issue covers original articles from researchers across the globe, based on the following three aspects: sustainable processes for obtaining biochar, its different applications, and emerging technologies for the use of biochar. We welcome articles in the following areas (but you are not limited to these):

  • Different processes for obtaining biochar.
  • Using biochar to capture greenhouse gases.
  • Biochar as an amendment soil and substrate of soil-less crops.
  • Biochar as an energy vector.
  • Use of biochar for wastewater treatment.
  • Soil decontamination.
  • Biochar use for gas cleaning.
  • Biochar as an additive to composite materials.
  • Emerging technologies for the use of biochar.

We look forward to receiving your contributions.

Prof. Dr. Rosa Rodriguez
Prof. Dr. Germán Mazza
Dr. María Paula Fabani
Guest Editors

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 submissions that pass pre-check are 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 250 words) can be sent to the Editorial Office for assessment.

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 2400 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

  • biochar
  • sustainable
  • emerging technologies
  • agriculture applications
  • energy vector
  • wastewater treatment
  • gas cleaning
  • soil decontamination
  • composite materials

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Published Papers (1 paper)

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Research

23 pages, 7790 KB  
Article
Ultrasound-Induced Embedded-Silica Migration to Biochar Surface: Applications in Agriculture and Environmental Sustainability
by Muhammad Abdullah, Shanza Baig, Maria Paula Hernández Martinez and Baharak Sajjadi
Sustainability 2025, 17(23), 10813; https://doi.org/10.3390/su172310813 - 2 Dec 2025
Viewed by 138
Abstract
Silicon (Si)–containing compounds, such as silica (SiO2), play a crucial role as fillers, binding phases, and linking agents in sustainable materials. Coating biochar with SiO2 can enhance its performance as a carbon-negative filler in composites such as bioplastics, rubber, asphalt, [...] Read more.
Silicon (Si)–containing compounds, such as silica (SiO2), play a crucial role as fillers, binding phases, and linking agents in sustainable materials. Coating biochar with SiO2 can enhance its performance as a carbon-negative filler in composites such as bioplastics, rubber, asphalt, and cement, making it more competitive with conventional fillers. Biochar, derived from biomass pyrolysis, contains a high concentration of biogenic SiO2—typically 50–80% of its total inorganic content. However, conventional extraction methods such as solvent extraction or gasification detach SiO2 from the biochar matrix, leading to energy-intensive and environmentally unfavorable processes. The objective of this study was to develop an environmentally friendly and energy-efficient approach to induce the migration of embedded biogenic SiO2 from within biochar to its surface—without detachment—using ultrasonic treatment. Fifteen biochar samples were produced by pyrolyzing five biomass types (sugarcane bagasse, miscanthus, wheat straw, corn stover, and railroad ties) at 650, 750, and 850 °C. Each sample was subsequently subjected to ultrasonic irradiation in an isopropanol–water mixture for 1 and 2 min. Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS) analyses confirmed that ultrasound treatment significantly enhanced SiO2 migration to the biochar surface, with up to a 2.5-fold increase in surface Si and O concentrations after 2 min of sonication. The effect was most pronounced for biochar synthesized at 850 °C, corresponding to higher surface porosity and structural stability. Fourier Transform Infrared (FTIR) spectroscopy revealed an increased intensity of the Si–O–Si asymmetric stretching band at 1030 cm−1, indicating surface enrichment of siloxane networks and rearrangement of Si-containing functional groups. Overall, the results demonstrate that ultrasound-assisted treatment is a viable and sustainable technique for enhancing SiO2 surface concentration and modifying the surface chemistry of biochar. This SiO2-enriched biochar shows potential for advanced applications in soil amendment, CO2 capture, water purification, and as a reactive additive in cementitious and asphalt composites. Full article
(This article belongs to the Special Issue Sustainable Development and Application of Biochar: 2nd Edition)
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