Application of Biochar in Environmental Research

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: 5 August 2024 | Viewed by 804

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Guest Editor
Department of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
Interests: biological treatment of organic waste (composting and anaerobic digestion); solid-state fermentation to convert wastes into bioproducts and nanotechnology for environmental remediation
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Special Issue Information

Dear Colleagues,

Biochar, the product resulting from the pyrolysis of C-based waste, has gained a significant role in environmental research. Biochar presents different characteristics depending on the pyrolysis process or the raw materials used. One of the main advantages of biochar is that it is a powerful product used to fix carbon, resulting in a decarbonization strategy.

This Special Issue is intended to compile recent research on the production and characterization of biochar to be used in a wide range of environmental applications.

Potential topics include, but are not limited to, the following:

  • The pyrolysis of organic waste.
  • Biochar characterization.
  • Water cleaning using biochar.
  • Wastewater treatment using biochar.
  • Enhanced composting with biochar.
  • Enhanced anaerobic digestion with biochar.
  • Crop improvement with biochar fertilization.
  • Heterogenous catalysis using biochar-based catalysts for environmental applications.
  • The combination of biochar with nanomaterials for environmental applications.

Prof. Dr. Antoni Sánchez
Guest Editor

Manuscript Submission Information

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Keywords

  • biochar
  • waste management
  • wastewater and water treatment
  • pyrolysis
  • fertilization
  • composting
  • anaerobic digestion
  • heterogenous catalysis
  • nanomaterials

Published Papers (1 paper)

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Research

27 pages, 10110 KiB  
Article
Sustainable Napier Grass (Pennisetum purpureum) Biochar for the Sorptive Removal of Acid Orange 7 (AO7) from Water
by Anand Kumar Yadav, Abhishek Kumar Chaubey, Shivang Kapoor, Tej Pratap, Brahmacharimayum Preetiva, Vineet Vimal and Dinesh Mohan
Processes 2024, 12(6), 1115; https://doi.org/10.3390/pr12061115 - 28 May 2024
Viewed by 564
Abstract
The unregulated discharge of synthetic dyes from various anthropogenic and industrial activities has resulted in the contamination of different environmental compartments. These dyes can contaminate water bodies, soil, and even the air, resulting in many environmental and health issues. True colors may persist [...] Read more.
The unregulated discharge of synthetic dyes from various anthropogenic and industrial activities has resulted in the contamination of different environmental compartments. These dyes can contaminate water bodies, soil, and even the air, resulting in many environmental and health issues. True colors may persist for long periods, thereby affecting the aesthetics and ecology of dye-contaminated areas. Furthermore, they pose potential risks to aquatic life and human health through the ingestion or absorption of dye-contaminated water or food. Acid orange 7 (AO7) is a synthetic azo dye used in the textile, tanning, food, pharmaceutical, paint, electronics, cosmetics, and paper and pulp industries. AO7 can have various human health implications, such as dermatitis, nausea, severe headache, respiratory tract irritation, and bone marrow depletion, due to its high toxicity, mutagenicity, and carcinogenicity. Efforts to regulate and mitigate dye pollution (AO7) are crucial for environmental sustainability and public health. Therefore, this study aimed to remove AO7 from water using sustainable biochar. This objective was accomplished by pyrolyzing dried Napier grass at 700 °C to develop affordable and sustainable Napier grass biochar (NGBC700). The developed biochar was characterized for its surface morphology, surface functional groups, surface area, and elemental composition. The yield, moisture content, and ash content of the NGBC700 were approximately 31%, 6%, and 21%, respectively. The NGBC700’s BET (Brunauer–Emmett–Teller) surface area was 108 m2 g−1. Batch sorption studies were carried out at different pH levels (2–10), biochar dosages (1, 2, 3, and 4 g L−1), and AO7 concentrations (10, 20, and 30 mg L−1). The kinetic data were better fitted to the pseudo-second-order (PSO) equation (R2 = 0.964–0.997) than the pseudo-first-order (PFO) equation (R2 = 0.789–0.988). The Freundlich isotherm equation (R2 = 0.965–0.994) fitted the sorption equilibrium data better than the Langmuir equation (R2 = 0.788–0.987), suggesting AO7 sorption on heterogenous NGBC700. The maximum monolayer AO7 adsorption capacities of the NGBC700 were 14.3, 12.7, and 8.4 mg g−1 at 10, 25, and 40 °C, respectively. The column AO7 sorption capacity was 4.4 mg g−1. Fixed-bed AO7 sorption data were fitted to the Thomas and Yoon–Nelson column models. The NGBC700 efficiently removed AO7 from locally available dye-laden wastewater. NGBC700 was regenerated using different NaOH concentrations. Possible interactions contributing to AO7 sorption on NGBC700 include hydrogen bonding, electrostatic interactions, and π–π electron donor–acceptor attractions. The estimated total preparation cost of NGBC700 was US$ 6.02 kg−1. The developed sustainable NGBC700 is potentially cost-effective and environmentally friendly, and it utilizes waste (Napier grass) to eliminate fatal AO7 dye from aqueous media. Full article
(This article belongs to the Special Issue Application of Biochar in Environmental Research)
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