What is it about?
In this study, carbon porous material (biochar) was produced from forestry residues through fast pyrolysis in the 2-4 kg/h auger reactor at 500°C. Biochar was the by-product of the thermochemical conversion in which bio-oil was the main product. Two novel methods of amine surface functionality of biochar were investigated by nitration and grafting of condensable silanes on the surface. The purpose of this study was to maximize the biochar capacity by modification of the structure (i.e. functionalizing and thermal activation) for CO2 adsorption.
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Why is it important?
This paper is critically important to researchers in the area of carbon-based adsorption, as it demonstrates that severe temperature and energy inefficient methods (typically implemented in carbon activation) may not be necessary for generation of highly adsorbent materials.
Perspectives
This paper shows the new finding related to the benefits of enhanced surface area compared to tailored functionality and indicates that there is potentially an optimum range of nitrogen group loading where the implanted nitrogen content makes up for a decrease in surface area. We have also shown that thermally activated, tailored biochar actually has higher adsorption capacity compared to commercially activated carbons and other carbon-based adsorbents in the literature.
Hanieh Bamdad
Memorial University of Newfoundland
Read the Original
This page is a summary of: Nitrogen Functionalized Biochar as a Renewable Adsorbent for Efficient CO2 Removal, Energy & Fuels, October 2018, American Chemical Society (ACS),
DOI: 10.1021/acs.energyfuels.8b03056.
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