Adsorption of arsenic(III) into modified lamellar Na-magadiite in aqueous medium-Thermodynamic of adsorption process

Journal Article · Mon Dec 15 00:00:00 EST 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.09.006· OSTI ID:21212147

Azevedo Pinto, Alane; Airoldi, Claudio ^[1]; Ribeiro Viana, Rubia ^[2]

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1. UNICAMP, Instituto de Quimica, Universidade Estadual de Campinas, Cp 6154, 13083-9700 Campinas, SP (Brazil)
2. UFMT, Universidade Federal de Matogrosso, Centro de Recursos Minerais, Cuiaba, Matogrosso 68060 900 (Brazil)

Synthetic Na-magadiite sample was used for organofunctionalization process with N-propyldiethylenetrimethoxysilane and bis[3-(triethoxysilyl)propyl]tetrasulfide, after expanding the interlayer distance with polar organic solvents such as dimethylsulfoxide (DMSO). The resulted materials were submitted to process of adsorption with arsenic solution at pH 2.0 and 298{+-}1 K. The adsorption isotherms were adjusted using a modified Langmuir equation with regression nonlinear; the net thermal effects obtained from calorimetric titration measurements were adjusted to a modified Langmuir equation. The adsorption process was exothermic ({delta}{sub int}H=-4.15-5.98 kJ mol{sup -1}) accompanied by increase in entropy ({delta}{sub int}S=41.32-62.20 J k{sup -1} mol{sup -1}) and Gibbs energy ({delta}{sub int}G=-22.44-24.56 kJ mol{sup -1}). The favorable values corroborate with the arsenic (III)/basic reactive centers interaction at the solid-liquid interface in the spontaneous process. - Grapical Abstract: The results suggest that the adsorption capacities increased with an increase of reactive basic centers in the pendant organic chains of the intercalated agent.

• OSTI ID: 21212147
• Journal Information: Journal of Solid State Chemistry, Vol. 181, Issue 12; Other Information: DOI: 10.1016/j.jssc.2008.09.006; PII: S0022-4596(08)00486-6; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ADSORPTION
ADSORPTION ISOTHERMS
ARSENIC COMPOUNDS
CALORIMETRY
CHEMICAL PROPERTIES
COMPOSITE MATERIALS
DMSO
ENTROPY
EQUATIONS
INTERFACES
LIQUIDS
NANOSTRUCTURES
ORGANIC SOLVENTS
PH VALUE
SOLIDS
SOLUTIONS
SURFACES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TITRATION