SOUZA, ELIEL S.SILVA, PAULO S.C.2019-07-262019-07-262019SOUZA, ELIEL S.; SILVA, PAULO S.C. Co adsorption in kaolinite. <b>Brazilian Journal of Radiation Sciences</b>, v. 7, n. 2A, p. 1-15, 2019. DOI: <a href="https://dx.doi.org/10.15392/bjrs.v7i2A.658">10.15392/bjrs.v7i2A.658</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/29963.2319-0612http://repositorio.ipen.br/handle/123456789/29963Adsorption of metal ions in clay minerals has been used as an alternative to water and effluents treatment. Kao-linite is a clay mineral that presents low specific surface area and exchange ion capacity. Nevertheless, structural modifications can be achieved by means of acid or thermal activation. In this paper, it was studied the surface area of kaolinite/bentonite, kaolinite/activated carbon mixtures, thermal activated kaolinite and thermal activat-ed kaolinite/activated carbon mixture. The mixture of kaolinite/activated carbon was tested for pH, contact time, interfering ions and initial concentration effects in the cobalt adsorption. Results showed that the optimized pa-rameters are pH 6 and contact time of 30 min. Chromium acted as a competitive ion, zinc does not appear to have affected adsorption while iron seems to have favored it. Langmuir and Freundlich isotherms indicated that the adsorption of Co in the mixture of kaolinite/activated carbon is a spontaneous process.1-15openAccesskaolinitebentonitecobalt ionscalcinationactivated carbonadsorptioninterfering elementsmixturesneutron activation analysisph valuesurface areawaste waterArtigo de periódico2A710.15392/bjrs.v7i2A.658https://orcid.org/0000-0002-9351-9201Sem Percentil