Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials

Industrialization increases the number of heavy metals released into the environment. Lead (Pb2+), nickel (Ni2+) and chromium (Cr6+) are among these toxic metals and cause irreversible effects on ecosystems and human health due to their bio-accumulative potential. The decontamination through adsorpt...

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Autores principales:	Cruz-Lopes Luísa P., Macena Morgana, Esteves Bruno, Guiné Raquel P. F.
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	biosorption chromium nickel lead walnut shell chestnut shell burnt wood Agriculture S Agriculture (General) S1-972
Acceso en línea:	https://doaj.org/article/e377d80f6f364e1eb84a8e583da5d2c6
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spelling	oai:doaj.org-article:e377d80f6f364e1eb84a8e583da5d2c62021-12-05T14:10:59ZIdeal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials2391-953110.1515/opag-2021-0225https://doaj.org/article/e377d80f6f364e1eb84a8e583da5d2c62021-02-01T00:00:00Zhttps://doi.org/10.1515/opag-2021-0225https://doaj.org/toc/2391-9531Industrialization increases the number of heavy metals released into the environment. Lead (Pb2+), nickel (Ni2+) and chromium (Cr6+) are among these toxic metals and cause irreversible effects on ecosystems and human health due to their bio-accumulative potential. The decontamination through adsorption processes using lignocellulosic wastes from agricultural and/or forestry processes is a viable solution. Hence, this work aimed at studying the effect of pH on the biosorption of the metal ions using four different by-product materials: walnut shell, chestnut shell, pinewood and burnt pinewood. These experiments were conducted with solutions of the three heavy metals in which the adsorbents were immersed to measure the rate of adsorption. A range of pH values from 3.0 to 7.5 was used in the experiments, and the concentrations were determined by atomic absorption. The results showed different behaviour of the biosorbent materials when applied to the different metals. The lead adsorption had an ideal pH in the range of 5.5–7.5 when the walnut shell was used as an adsorbent, corresponding to values of adsorption greater than 90%, but for the other materials, maximum adsorption occurred for a pH of 7.5. For the adsorption of chromium, the pH was very heterogeneous with all adsorbents, with optimal values of pH varying from 3.0 (for chestnut shell) to 6.5 (for walnut shell and wood). For nickel, the best pH range was around pH 5, with different values according to the lignocellulosic material used. These results indicate that the tested biosorbents have the potential to decontaminate wastewater in variable extensions and that by controlling the pH of the solution; a more efficient removal of the heavy metals can be achieved.Cruz-Lopes Luísa P.Macena MorganaEsteves BrunoGuiné Raquel P. F.De Gruyterarticlebiosorptionchromiumnickelleadwalnut shellchestnut shellburnt woodAgricultureSAgriculture (General)S1-972ENOpen Agriculture, Vol 6, Iss 1, Pp 115-123 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	biosorption chromium nickel lead walnut shell chestnut shell burnt wood Agriculture S Agriculture (General) S1-972
spellingShingle	biosorption chromium nickel lead walnut shell chestnut shell burnt wood Agriculture S Agriculture (General) S1-972 Cruz-Lopes Luísa P. Macena Morgana Esteves Bruno Guiné Raquel P. F. Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials
description	Industrialization increases the number of heavy metals released into the environment. Lead (Pb2+), nickel (Ni2+) and chromium (Cr6+) are among these toxic metals and cause irreversible effects on ecosystems and human health due to their bio-accumulative potential. The decontamination through adsorption processes using lignocellulosic wastes from agricultural and/or forestry processes is a viable solution. Hence, this work aimed at studying the effect of pH on the biosorption of the metal ions using four different by-product materials: walnut shell, chestnut shell, pinewood and burnt pinewood. These experiments were conducted with solutions of the three heavy metals in which the adsorbents were immersed to measure the rate of adsorption. A range of pH values from 3.0 to 7.5 was used in the experiments, and the concentrations were determined by atomic absorption. The results showed different behaviour of the biosorbent materials when applied to the different metals. The lead adsorption had an ideal pH in the range of 5.5–7.5 when the walnut shell was used as an adsorbent, corresponding to values of adsorption greater than 90%, but for the other materials, maximum adsorption occurred for a pH of 7.5. For the adsorption of chromium, the pH was very heterogeneous with all adsorbents, with optimal values of pH varying from 3.0 (for chestnut shell) to 6.5 (for walnut shell and wood). For nickel, the best pH range was around pH 5, with different values according to the lignocellulosic material used. These results indicate that the tested biosorbents have the potential to decontaminate wastewater in variable extensions and that by controlling the pH of the solution; a more efficient removal of the heavy metals can be achieved.
format	article
author	Cruz-Lopes Luísa P. Macena Morgana Esteves Bruno Guiné Raquel P. F.
author_facet	Cruz-Lopes Luísa P. Macena Morgana Esteves Bruno Guiné Raquel P. F.
author_sort	Cruz-Lopes Luísa P.
title	Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials
title_short	Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials
title_full	Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials
title_fullStr	Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials
title_full_unstemmed	Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials
title_sort	ideal ph for the adsorption of metal ions cr6+, ni2+, pb2+ in aqueous solution with different adsorbent materials
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/e377d80f6f364e1eb84a8e583da5d2c6
work_keys_str_mv	AT cruzlopesluisap idealphfortheadsorptionofmetalionscr6ni2pb2inaqueoussolutionwithdifferentadsorbentmaterials AT macenamorgana idealphfortheadsorptionofmetalionscr6ni2pb2inaqueoussolutionwithdifferentadsorbentmaterials AT estevesbruno idealphfortheadsorptionofmetalionscr6ni2pb2inaqueoussolutionwithdifferentadsorbentmaterials AT guineraquelpf idealphfortheadsorptionofmetalionscr6ni2pb2inaqueoussolutionwithdifferentadsorbentmaterials
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Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials

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