Hydrogels based on polyacrylamide and functionalized carbon nanomaterials for adsorption of a cationic dye

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dc.creatorTiago Silveira
dc.creatorVinicius Caliman
dc.creatorGlaura Goulart Silva
dc.date.accessioned2025-09-05T13:22:43Z
dc.date.accessioned2025-09-08T23:36:11Z
dc.date.available2025-09-05T13:22:43Z
dc.date.issued2022
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.identifier.doihttps://doi.org/10.1007/s10924-022-02624-w
dc.identifier.issn1572-8919
dc.identifier.urihttps://hdl.handle.net/1843/84916
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Polymers and the Environment
dc.rightsAcesso Restrito
dc.subjectCorantes
dc.subjectPoliacrilamida
dc.subjectGrafeno
dc.subjectNanotubos de carbono
dc.subjectAdsorção
dc.subjectÁguas residuais
dc.subjectTermogravimetria
dc.subjectCalorimetria
dc.subjectEspectroscopia de infravermelho
dc.subjectMicroscopia eletronica de varredura
dc.subject.otherMalachite green adsorption
dc.subject.otherPolyacrylamide hydrogel
dc.subject.otherGraphene oxide
dc.subject.otherCarbon nanotube
dc.titleHydrogels based on polyacrylamide and functionalized carbon nanomaterials for adsorption of a cationic dye
dc.typeArtigo de periódico
local.citation.epage5351
local.citation.spage5339
local.citation.volume30
local.description.resumoMalachite green (MG) is used for the dyeing of cotton, paper, and jute, among other materials, and presents acute toxicity to a wide range of aquatic and terrestrial animals. A polyacrylamide (PA) hydrogel modified with a low content of oxygenated and aminated carbon nanomaterials may be a suitable candidate to adsorb MG from wastewater. Herein, graphene oxide and carbon nanotubes (CNTs) were incorporated during the in situ polymerization of PA. The hydrogels were characterized through thermogravimetry, differential scanning calorimetry and infrared spectroscopy as well as imagined by scanning electron microscopy. The swelling and adsorption capacity were investigated to explore the influences of different carbon dimensionalities (1D and 2D), zeta potentials and nanofiller concentrations on the adsorption behavior of the hydrogel. There was an increase of approximately 1500% in the adsorption capacity after 24 h of exposure of a hydrogel with graphene oxide (GO) at 0.25 wt% with respect to the neat PA. Aminated graphene produced similar gains in the adsorption capacity of the GO-hydrogel, although it presents a positive zeta potential that is the opposite of that of GO. The modified CNTs showed smaller gains in the adsorption capacity, reaching a maximum 400% increase with respect to the PA hydrogel. The main factors that seem to affect the adsorption capacity were the dimensionality and degree of functionalization. The graphene oxide-based nanofillers were 3 to 4 times more functionalized than the nanotubes. The adsorption results were adjusted with a pseudo-second order kinetic model that allowed a complementary discussion about the nature of the physico-chemical effects on the process of MG adsorption in the hydrogel nanocomposites.
local.identifier.orcidhttps://orcid.org/0000-0002-3098-1562
local.identifier.orcidhttps://orcid.org/0000-0002-0308-0179
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://link.springer.com/article/10.1007/s10924-022-02624-w

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