Adsorptive, thermodynamic and kinetic performances of Al/Ti and Al/Zr-pillared clays from the Brazilian Amazon region for zinc cation removal

Guerra, Denis L.; Airoldi, Cláudio; Lemos, Vanda Porpino; Angélica, Rômulo Simões

doi:10.1016/j.jhazmat.2007.11.054

Cited by 68 publications

(33 citation statements)

References 36 publications

(77 reference statements)

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“…The amount of the metallic cation removed during adsorption (mmol dm -3 ) was calculated by the expression N f = (N i -N S )/m, were N f is the number of moles of metal adsorbed on the pendant reactive groups of the clay samples, N i and N S are the number of moles in the initial solution and in the supernatant after equilibrium, and m is the mass of samples used for each clay sample. 14,15 Profiles of the adsorption isotherms obtained, represented by the number of moles adsorbed (N f ), versus the number of moles at equilibrium per volume of solution (C S ), for a series of isotherms, reveal that the adsorption process conforms to the Sips model. Sips (1948) , respectively, which depend on the number of available reactive adsorption sites, K S is the equilibrium constant and n is the Freundlich exponent.…”

Section: Adsorption Experimentsmentioning

confidence: 93%

Adsorption of thorium(IV) on chemically modified Amazon clays

Guerra¹,

Viana²,

Airoldi³

2009

J. Braz. Chem. Soc.

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Amostras de caulinita e esmectita oriundas da região Amazônica, Brasil, foram modificadas com 2-mercaptobenzimidazol (MBI) usando rotas homogênea e heterogênea. As amostras de argilas modificadas (K HOM, S HOM , K HET e S HET ) foram caracterizadas por análise textural, MEV e espectroscopia 13 C NMR. As argilas modificadas quimicamente apresentaram modificações em suas propriedades físico-químicas incluindo: área específica 48,0 (S) para 869,8 m 2 g -1 (S HET ). A habilidade destes materiais para remover tório(IV) em soluções aquosas foi investigada por um série de isotermas de adsorção ajustadas pela equação de Sips em temperatura ambiente e pH 2,0. O número máximo de mols adsorvidos foi determinado em 8,29,8,86,9,57 e 9,89 10 -1 mmol g -1 para K HOM , K HET , S HOM e S HET , respectivamente. Os efeitos energéticos causados pela adsorção do cation tório(IV) foram determinados através de metodologia calorimétrica.Kaolinite and smectite clay samples from the Amazon region, Brazil, were modified with 2-mercaptobenzimidazole (MBI) using homogeneous and heterogeneous routes. The modified clay samples (K HOM , S HOM , K HET and S HET ) were characterized by textural analysis, SEM and 13 C NMR spectroscopy. The chemically modified clay samples showed modifications of their physicalchemical properties including: specific area 48.0 (S) to 869.8 m 2 g -1 (S HET ). The ability of these materials to remove thorium(IV) from aqueous solution was followed by a series of adsorption isotherms adjusted to a Sips equation at room temperature, and pH 2.0. The maximum number of moles adsorbed was determined to be 8. 29, 8.86, 9.57 and 9.89 10 -1 mmol g -1 for K HOM , K HET , S HOM and S HET , respectively. The energetic effects (∆ int H, ∆ int G and ∆ int S) caused by thorium(IV) cation adsorption were determined through calorimetry.

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Section: Adsorption Experimentsmentioning

confidence: 93%

Adsorption of thorium(IV) on chemically modified Amazon clays

Guerra¹,

Viana²,

Airoldi³

2009

J. Braz. Chem. Soc.

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“…H-mordenite appears as corn flakelike crystals with a fluffy appearance revealing its extremely fine plate-like structure [15]. Pt crystallites are noticeable in sample Pt/H-mordenite.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 98%

Phenol removal from aqueous solutions by using H-mordenite and platinum supported H-mordenite

et al. 2015

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“…We previously showed that zirconium pillared Mt (Zr-Mt) as adsorbent was a cheap, feasible and effective approach to remove Cr 3+ [7]. And Guerra et al found that the adsorption capacity of Zr-Mt is better than that of Zr/Al-Mt [8].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of zirconium-pillared montmorillonite porous ceramic as adsorbents for Cr 3+ removal and recycling

Hei

et al. 2016

Ceramics International

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Adsorptive, thermodynamic and kinetic performances of Al/Ti and Al/Zr-pillared clays from the Brazilian Amazon region for zinc cation removal

Cited by 68 publications

References 36 publications

Adsorption of thorium(IV) on chemically modified Amazon clays

Adsorption of thorium(IV) on chemically modified Amazon clays

Phenol removal from aqueous solutions by using H-mordenite and platinum supported H-mordenite

Fabrication of zirconium-pillared montmorillonite porous ceramic as adsorbents for Cr 3+ removal and recycling

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