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Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+)

In this study, aged biochar (CCB350 and CCB650) were obtained from pyrolysis of corn stalk biochar (CB350 and CB650) at the degree of 350 °C and 650 °C by artificial oxidation with hydrogen peroxide (H(2)O(2)). Also, the mechanism of Pb(2+) and Cd(2+) on fresh and aged biochars was analyzed qualitat...

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Autores principales: Wang, Zhe, Geng, Chengxin, Bian, Yuan, Zhang, Guangyu, Zheng, Chunli, An, Chunjiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9252994/
https://www.ncbi.nlm.nih.gov/pubmed/35788642
http://dx.doi.org/10.1038/s41598-022-15494-y
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author Wang, Zhe
Geng, Chengxin
Bian, Yuan
Zhang, Guangyu
Zheng, Chunli
An, Chunjiang
author_facet Wang, Zhe
Geng, Chengxin
Bian, Yuan
Zhang, Guangyu
Zheng, Chunli
An, Chunjiang
author_sort Wang, Zhe
collection PubMed
description In this study, aged biochar (CCB350 and CCB650) were obtained from pyrolysis of corn stalk biochar (CB350 and CB650) at the degree of 350 °C and 650 °C by artificial oxidation with hydrogen peroxide (H(2)O(2)). Also, the mechanism of Pb(2+) and Cd(2+) on fresh and aged biochars was analyzed qualitatively and quantitatively by batch adsorption experiments combined with characterization. The adsorption isotherm results showed that aging treatment decreased the adsorption capacity of Pb(2+) and Cd(2+) and inhibited the competitive adsorption behavior of heavy metals. In the single-metal system, precipitation and cation exchange were considered as the main adsorption mechanisms for CB350 and CB650, with a ratio of 40.07–48.23% and 38.04–57.19%, respectively. Competition between Pb(2+) and Cd(2+) increased the relative contribution of mineral precipitation, but decreased the contribution of cation exchange mechanism. Aging resulted in the rise of the contribution of surface complexation to the adsorption of Pb(2+) and Cd(2+) on biochars, especially in low-temperature biochars, but weakened the contribution of mineral precipitation to the adsorption. Further, the contribution of other adsorption mechanisms was significantly enhanced for high-temperature aged biochars. These results are important to evaluate its long-term application prospects in the natural environment.
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spelling pubmed-92529942022-07-06 Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+) Wang, Zhe Geng, Chengxin Bian, Yuan Zhang, Guangyu Zheng, Chunli An, Chunjiang Sci Rep Article In this study, aged biochar (CCB350 and CCB650) were obtained from pyrolysis of corn stalk biochar (CB350 and CB650) at the degree of 350 °C and 650 °C by artificial oxidation with hydrogen peroxide (H(2)O(2)). Also, the mechanism of Pb(2+) and Cd(2+) on fresh and aged biochars was analyzed qualitatively and quantitatively by batch adsorption experiments combined with characterization. The adsorption isotherm results showed that aging treatment decreased the adsorption capacity of Pb(2+) and Cd(2+) and inhibited the competitive adsorption behavior of heavy metals. In the single-metal system, precipitation and cation exchange were considered as the main adsorption mechanisms for CB350 and CB650, with a ratio of 40.07–48.23% and 38.04–57.19%, respectively. Competition between Pb(2+) and Cd(2+) increased the relative contribution of mineral precipitation, but decreased the contribution of cation exchange mechanism. Aging resulted in the rise of the contribution of surface complexation to the adsorption of Pb(2+) and Cd(2+) on biochars, especially in low-temperature biochars, but weakened the contribution of mineral precipitation to the adsorption. Further, the contribution of other adsorption mechanisms was significantly enhanced for high-temperature aged biochars. These results are important to evaluate its long-term application prospects in the natural environment. Nature Publishing Group UK 2022-07-04 /pmc/articles/PMC9252994/ /pubmed/35788642 http://dx.doi.org/10.1038/s41598-022-15494-y Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Wang, Zhe
Geng, Chengxin
Bian, Yuan
Zhang, Guangyu
Zheng, Chunli
An, Chunjiang
Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+)
title Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+)
title_full Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+)
title_fullStr Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+)
title_full_unstemmed Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+)
title_short Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd(2+) and Pb(2+)
title_sort effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of cd(2+) and pb(2+)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9252994/
https://www.ncbi.nlm.nih.gov/pubmed/35788642
http://dx.doi.org/10.1038/s41598-022-15494-y
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