Mercaptopropyl-grafted Magadiite For Lead And Cadmium Sorption And Calorimetric Determination

dc.creatorPires
dc.creatorCleo T. G. V. M. T.; Pinto
dc.creatorAlane A.; Sousa
dc.creatorKaline S.; Airoldi
dc.creatorClaudio
dc.date2016
dc.datedez
dc.date2017-11-13T13:16:33Z
dc.date2017-11-13T13:16:33Z
dc.date.accessioned2018-03-29T05:53:48Z
dc.date.available2018-03-29T05:53:48Z
dc.identifierJournal Of Thermal Analysis And Calorimetry. Springer, v. 126, p. 1513 - 1520, 2016.
dc.identifier1388-6150
dc.identifier1572-8943
dc.identifierWOS:000387852700052
dc.identifier10.1007/s10973-016-5684-3
dc.identifierhttps://link.springer.com/article/10.1007/s10973-016-5684-3
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/327561
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1364586
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionSodium magadiite anchored with 3-mercaptopropyltrimethoxysilane was synthesized through direct functionalization. After this reaction, it was observed a decrease in crystallinity, with a slight increase in basal distance to 1.57 nm, when compared to the precursor value of 1.53 nm. This organofunctionalization was evidenced through infrared spectroscopy, indicating by the presence of C-H stretching vibration in the 2900-2800 cm(-1) region and mainly from the appearance of T species at the Si-29 NMR spectrum, centered at -65 and -55 ppm. The pendant chains covalently bonded to magadiite layers have the ability to sorb lead and cadmium cations, through a batch-wise method at 298 +/- 1 K, to give the maximum sorption capacity values of 1.54 and 2.72 mmol g(-1), respectively. The energetic effects caused by both cation/sulfur basic center interactions at the solid/liquid interface were determined through calorimetric titration, to give the enthalpies -13.48 +/- 0.05 and -0.83 +/- 0.053 kJ mol(-1) for lead and cadmium, respectively. The sulfur basic centers attached to the pendant chains reflect in spontaneous process with negative Gibbs energies of -26.8 +/- 0.1 and -24.5 +/- 0.1 kJ mol(-1), resulting also in positive entropies of 44 +/- 1 and 79 +/- 1 J K-1 mol(-1), respectively. This set of favorable thermodynamic data is more pronounced for the softer cation in interacting with the basic atom.
dc.description126
dc.description3
dc.description1513
dc.description1520
dc.descriptionCoordenacao de Aperfeicoamento de Pessoal de Ensino Superior (CAPES)
dc.descriptionConselho Nacional de Pesquisa (CNPq)
dc.descriptionFundacao de Amparo a pesquisa no Estado de Sao Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageEnglish
dc.publisherSpringer
dc.publisherDordrecht
dc.relationJournal of Thermal Analysis and Calorimetry
dc.rightsfechado
dc.sourceWOS
dc.subjectMagadiite
dc.subjectOrganofunctionalization
dc.subjectSorption
dc.subjectCalorimetry
dc.subjectThermodynamic
dc.titleMercaptopropyl-grafted Magadiite For Lead And Cadmium Sorption And Calorimetric Determination
dc.typeArtículos de revistas


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