Preparation of biochar with high absorbability and its nutrient adsorption-desorption behaviour.

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ID: 67381
2019
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Abstract
To study the formation of biochar with high absorbability, experiments were carried out at different carbonization temperature (300, 400, 600, and 800 °C) and under different carbonization atmosphere (activating gases (steam and CO) and inert gas (N)) to prepare biochar. In this paper, the effects of the carbonization atmosphere on the biochar pore structure were studied, and the influence of the biochar pore structure on the adsorption-desorption behaviour of nutrients (NH-N, NO-N, P, and K) was investigated. Experimental results: (1) The activating gases (steam and CO) can catalytically crack activated carbon atoms and tar blocking the biochar pores at high temperatures (T > 600 °C), and the activating gas promotes the formation of microporous biochar (d < 2 nm). (2) Micropores with a pore diameter distribution of 0.6-2 nm in biochar have the strongest nutrients adsorption, and pores with a diameter below 0.6 nm cannot adsorb hydrated ions of nutrients. (3) Biochar prepared at 600 °C and CO atmosphere has the best adsorption effect on nutrients. The adsorption kinetic was well described by Pseudo-second-order model. (4) After 5 cycles of biochar, the adsorption of the nutrients is still >40% of the first adsorption. Biochar has relatively high reusability.
Reference Key
gong2019preparationthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Gong, Huabo;Tan, Zhongxin;Zhang, Limei;Huang, Qiaoyun;
Journal The Science of the total environment
Year 2019
DOI
S0048-9697(19)33666-6
URL
Keywords
pore structure biochar nutrient activating gas adsorption–desorption process

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