Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)

Cadmium (Cd) is a highly toxic heavy metal that can become available to the environment from a variety of sources. The thermal transformation of organic residues into biochar can be a sustainable way to reduce cadmium environmental availability and, at the same time, a waste management solution. We...

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Autores principales:	Bárbara Samartini Queiroz Alves, Luiz Arnaldo Fernandes, Randal J. Southard
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Biochar Adsorption Aging with H2O2 Cd remediation Soil chemistry Waste management Science (General) Q1-390 Social sciences (General) H1-99
Acceso en línea:	https://doaj.org/article/f372bca751c14b819c260940a4e17862
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spelling	oai:doaj.org-article:f372bca751c14b819c260940a4e178622021-12-04T04:35:25ZBiochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)2405-844010.1016/j.heliyon.2021.e08476https://doaj.org/article/f372bca751c14b819c260940a4e178622021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2405844021025792https://doaj.org/toc/2405-8440Cadmium (Cd) is a highly toxic heavy metal that can become available to the environment from a variety of sources. The thermal transformation of organic residues into biochar can be a sustainable way to reduce cadmium environmental availability and, at the same time, a waste management solution. We studied sixteen biochars in two versions: unaged and aged with hydrogen peroxide (H2O2), regarding their Cd retention capacity. Feedstocks used included softwood biochar (SWB), almond shell (ASB), walnut shell (WSB), sewage sludge (SSB), and coconut shell (CSB); production temperatures varied from 450 to 900 °C. The objectives of this research were to understand the role of biochar properties on Cd adsorption rates and to evaluate how properties and adsorption rates vary as a function of H2O2 aging. Feedstock played a more important role than production temperature in determining biochar properties. Cd-adsorption capacity ranged from 0.67 to 415.67 mg/g, and the biochars that adsorbed the most Cd were SSB 700, SWB 800 – i, CSB 600 – m2, ASB 500–1, CSB 600 – m3, WSB 900, and CSB 600. The properties that best explained this variation in Cd retention were ash, sulfur, nitrogen and carbon content. Variation in oxygen content, cation exchange capacity and surface area had less impact of Cd adsorption. The H2O2 aging caused oxygen content to increase in all biochars, but the increase in Cd retention was not significant for the majority of the biochars and aging even reduced the Cd retention in some. Our results may help design biochars with maximized sites for Cd adsorption.Bárbara Samartini Queiroz AlvesLuiz Arnaldo FernandesRandal J. SouthardElsevierarticleBiocharAdsorptionAging with H2O2Cd remediationSoil chemistryWaste managementScience (General)Q1-390Social sciences (General)H1-99ENHeliyon, Vol 7, Iss 12, Pp e08476- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biochar Adsorption Aging with H2O2 Cd remediation Soil chemistry Waste management Science (General) Q1-390 Social sciences (General) H1-99
spellingShingle	Biochar Adsorption Aging with H2O2 Cd remediation Soil chemistry Waste management Science (General) Q1-390 Social sciences (General) H1-99 Bárbara Samartini Queiroz Alves Luiz Arnaldo Fernandes Randal J. Southard Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)
description	Cadmium (Cd) is a highly toxic heavy metal that can become available to the environment from a variety of sources. The thermal transformation of organic residues into biochar can be a sustainable way to reduce cadmium environmental availability and, at the same time, a waste management solution. We studied sixteen biochars in two versions: unaged and aged with hydrogen peroxide (H2O2), regarding their Cd retention capacity. Feedstocks used included softwood biochar (SWB), almond shell (ASB), walnut shell (WSB), sewage sludge (SSB), and coconut shell (CSB); production temperatures varied from 450 to 900 °C. The objectives of this research were to understand the role of biochar properties on Cd adsorption rates and to evaluate how properties and adsorption rates vary as a function of H2O2 aging. Feedstock played a more important role than production temperature in determining biochar properties. Cd-adsorption capacity ranged from 0.67 to 415.67 mg/g, and the biochars that adsorbed the most Cd were SSB 700, SWB 800 – i, CSB 600 – m2, ASB 500–1, CSB 600 – m3, WSB 900, and CSB 600. The properties that best explained this variation in Cd retention were ash, sulfur, nitrogen and carbon content. Variation in oxygen content, cation exchange capacity and surface area had less impact of Cd adsorption. The H2O2 aging caused oxygen content to increase in all biochars, but the increase in Cd retention was not significant for the majority of the biochars and aging even reduced the Cd retention in some. Our results may help design biochars with maximized sites for Cd adsorption.
format	article
author	Bárbara Samartini Queiroz Alves Luiz Arnaldo Fernandes Randal J. Southard
author_facet	Bárbara Samartini Queiroz Alves Luiz Arnaldo Fernandes Randal J. Southard
author_sort	Bárbara Samartini Queiroz Alves
title	Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)
title_short	Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)
title_full	Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)
title_fullStr	Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)
title_full_unstemmed	Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)
title_sort	biochar-cadmium retention and its effects after aging with hydrogen peroxide (h2o2)
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/f372bca751c14b819c260940a4e17862
work_keys_str_mv	AT barbarasamartiniqueirozalves biocharcadmiumretentionanditseffectsafteragingwithhydrogenperoxideh2o2 AT luizarnaldofernandes biocharcadmiumretentionanditseffectsafteragingwithhydrogenperoxideh2o2 AT randaljsouthard biocharcadmiumretentionanditseffectsafteragingwithhydrogenperoxideh2o2
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Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)

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