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Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution

Lead (Pb) and cadmium (Cd) are toxic heavy metals commonly found in aqueous environments. Biochar as a green adsorbent generated from biomass feedstock may be used for effective removal of these heavy metals. This study investigated the adsorption kinetics and isotherms of Pb(2+) and Cd(2+) in aqueo...

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Autores principales: Liu, Xiyang, Li, Gaoxiang, Chen, Chengyu, Zhang, Xiaorui, Zhou, Kuan, Long, Xinxian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8799728/
https://www.ncbi.nlm.nih.gov/pubmed/35091639
http://dx.doi.org/10.1038/s41598-022-05652-7
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author Liu, Xiyang
Li, Gaoxiang
Chen, Chengyu
Zhang, Xiaorui
Zhou, Kuan
Long, Xinxian
author_facet Liu, Xiyang
Li, Gaoxiang
Chen, Chengyu
Zhang, Xiaorui
Zhou, Kuan
Long, Xinxian
author_sort Liu, Xiyang
collection PubMed
description Lead (Pb) and cadmium (Cd) are toxic heavy metals commonly found in aqueous environments. Biochar as a green adsorbent generated from biomass feedstock may be used for effective removal of these heavy metals. This study investigated the adsorption kinetics and isotherms of Pb(2+) and Cd(2+) in aqueous solutions at different pH by biochar prepared from banana stem and leaf (BSL-BC) at 400 °C. Characterizations using scanning electron microscope, X-ray diffraction, and Fourier-transform infrared spectroscopy showed that the synthesized BSL-BC had rough surface, porous structure, and oxygen-containing functional groups. The adsorption of Pb(2+) and Cd(2+) onto BSL-BC reached equilibrium in 8 h and 200 min, respectively, with faster adsorption attained at higher pH and the optimum pH occurred at 5 (Pb(2+)) and 8 (Cd(2+)). All adsorption kinetic data followed the pseudo-second-order rate model. The adsorption isotherm data of Pb(2+) and Cd(2+) could be well-described by the Langmuir and Freundlich models, respectively, whereas neither the Temkin or Dubinin–Radushkevich models provided satisfactory fitting results. The maximum adsorption capacities for Pb(2+) and Cd(2+) were 302.20 and 32.03 mg/g, respectively. The calculated mechanism contributions showed that complexation with oxygen-containing functional groups, ion exchange, mineral precipitation, and Pb(2+)/Cd(2+)-π coordination accounted for 0.1%, 8.4%, 88.8%, and 2.6% to Pb(2+) adsorption, and 0.4%, 6.3%, 83.0%, and 10.4% to Cd(2+) adsorption, respectively. Therefore, mineral precipitation was likely the major mechanism responsible for adsorption of both Pb(2+) and Cd(2+) by BSL-BC. The results suggest that the synthesized BSL-BC has great potential for adsorption of Pb(2+) and Cd(2+) from aqueous solutions.
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spelling pubmed-87997282022-02-01 Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution Liu, Xiyang Li, Gaoxiang Chen, Chengyu Zhang, Xiaorui Zhou, Kuan Long, Xinxian Sci Rep Article Lead (Pb) and cadmium (Cd) are toxic heavy metals commonly found in aqueous environments. Biochar as a green adsorbent generated from biomass feedstock may be used for effective removal of these heavy metals. This study investigated the adsorption kinetics and isotherms of Pb(2+) and Cd(2+) in aqueous solutions at different pH by biochar prepared from banana stem and leaf (BSL-BC) at 400 °C. Characterizations using scanning electron microscope, X-ray diffraction, and Fourier-transform infrared spectroscopy showed that the synthesized BSL-BC had rough surface, porous structure, and oxygen-containing functional groups. The adsorption of Pb(2+) and Cd(2+) onto BSL-BC reached equilibrium in 8 h and 200 min, respectively, with faster adsorption attained at higher pH and the optimum pH occurred at 5 (Pb(2+)) and 8 (Cd(2+)). All adsorption kinetic data followed the pseudo-second-order rate model. The adsorption isotherm data of Pb(2+) and Cd(2+) could be well-described by the Langmuir and Freundlich models, respectively, whereas neither the Temkin or Dubinin–Radushkevich models provided satisfactory fitting results. The maximum adsorption capacities for Pb(2+) and Cd(2+) were 302.20 and 32.03 mg/g, respectively. The calculated mechanism contributions showed that complexation with oxygen-containing functional groups, ion exchange, mineral precipitation, and Pb(2+)/Cd(2+)-π coordination accounted for 0.1%, 8.4%, 88.8%, and 2.6% to Pb(2+) adsorption, and 0.4%, 6.3%, 83.0%, and 10.4% to Cd(2+) adsorption, respectively. Therefore, mineral precipitation was likely the major mechanism responsible for adsorption of both Pb(2+) and Cd(2+) by BSL-BC. The results suggest that the synthesized BSL-BC has great potential for adsorption of Pb(2+) and Cd(2+) from aqueous solutions. Nature Publishing Group UK 2022-01-28 /pmc/articles/PMC8799728/ /pubmed/35091639 http://dx.doi.org/10.1038/s41598-022-05652-7 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
Liu, Xiyang
Li, Gaoxiang
Chen, Chengyu
Zhang, Xiaorui
Zhou, Kuan
Long, Xinxian
Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution
title Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution
title_full Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution
title_fullStr Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution
title_full_unstemmed Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution
title_short Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution
title_sort banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8799728/
https://www.ncbi.nlm.nih.gov/pubmed/35091639
http://dx.doi.org/10.1038/s41598-022-05652-7
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