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

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dc.creatorBarbara Samartini Queiroz Alves
dc.creatorLuiz Arnaldo Fernandes
dc.creatorRandal J. Southard
dc.date.accessioned2023-05-23T18:23:59Z
dc.date.accessioned2025-09-09T00:26:48Z
dc.date.available2023-05-23T18:23:59Z
dc.date.issued2021
dc.identifier.doihttps://doi.org/10.1016/j.heliyon.2021.e08476
dc.identifier.issn2405-8440
dc.identifier.urihttps://hdl.handle.net/1843/53817
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofHeliyon
dc.rightsAcesso Aberto
dc.subjectAdsorção
dc.subjectQuímica do solo
dc.subjectGestão de resíduos
dc.subject.otherBiochar
dc.subject.otherAdsorption
dc.subject.otherAging with H2O2
dc.subject.otherCd remediation
dc.subject.otherSoil chemistry
dc.subject.otherWaste management
dc.titleBiochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)
dc.typeArtigo de periódico
local.citation.epage14
local.citation.spage1
local.citation.volume7
local.description.resumoCadmium (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.
local.publisher.countryBrasil
local.publisher.departmentICA - INSTITUTO DE CIÊNCIAS AGRÁRIAS
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S2405844021025792?via%3Dihub

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