Application of Brazilian kaolinite clay as adsorbent to removal of U(VI) from aqueous solution: Kinetic and thermodynamic of cation–basic interactions

• Published in: Journal of solid state chemistry Vol. 183; no. 5; pp. 1141 - 1149
• Main Authors: Guerra, Denis L., Leidens, Victor L., Viana, Rúbia R., Airoldi, Claudio
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01-05-2010; Elsevier
• Subjects: ACTINIDE COMPOUNDS; ADSORPTION; ADSORPTION ISOTHERMS; AMINES; AQUEOUS SOLUTIONS; BASIC INTERACTIONS; CALORIMETRY; CATIONS; CHARGED PARTICLES; CHEMICAL ANALYSIS; Clay (material); CLAYS; COHERENT SCATTERING; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; DIFFRACTION; DISPERSIONS; ELECTRON MICROSCOPY; Exact sciences and technology; Growth from solutions; HOMOGENEOUS MIXTURES; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; INTERACTIONS; IONS; ISOTHERMS; KAOLINITE; MATERIALS; Materials science; Mathematical models; Methods of crystal growth; physics of crystal growth; MICROSCOPY; MINERALS; MIXTURES; NMR SPECTRA; ORGANIC COMPOUNDS; ORGANIC SILICON COMPOUNDS; Physics; POROUS MATERIALS; Porous materials; granular materials; QUANTITATIVE CHEMICAL ANALYSIS; SCANNING ELECTRON MICROSCOPY; SCATTERING; SILICATE MINERALS; Solid surfaces and solid-solid interfaces; SOLUTIONS; SORPTION; Specific materials; SPECTRA; Surface chemistry; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); TEMPERATURE RANGE; TEMPERATURE RANGE 0273-0400 K; Thermodynamic; TITRATION; TRANSMISSION ELECTRON MICROSCOPY; URANIUM COMPOUNDS; Uranyl; VOLUMETRIC ANALYSIS; X-RAY DIFFRACTION; Calorimetry; Kaolinite; Adsorption; Uranyl; Thermodynamic; Second order; pH value; Propyl compounds; Porous materials; XRD; Adsorbents; Clays; Aqueous solutions; Crystal growth from solutions; Adsorption isotherms; Kinetics; NMR spectra; Scanning transmission electron microscopy; Carbon 13
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2010.03.021

The compound N
1-[3-(trimethoxysilyl)propyl]diethylenetriamine was anchored onto Amazon kaolinite surface by heterogeneous route. The modified and natural kaolinite samples were characterized by transmission electron microscopy, scanning electron microscopic, X-ray diffraction, and nuclear magnetic nuclei of
29Si and
13C. The well-defined peaks obtained in the
13C NMR spectrum in the 5.0–62.1
ppm region confirmed the attachment of organic functional groups as pendant chains bonded into the porous clay. The ability of these materials to remove U(VI) from aqueous solution was followed by a series of adsorption isotherms adjusted to a Sips equation at room temperature and pH 4.0. The kinetic parameters analyzed by the Lagergren and Elovich models gave a good fit for a pseudo-second order reaction with
k
2 values 16.0 and 25.1
mmol
g
−1
min
−1 ranges for natural and modified kaolinite clays, respectively. The energetic effects caused by metal ion adsorption were determined through calorimetric titrations.
This investigation reports the use of original and modified kaolinites as alternative absorbents. The compound N-[3-trimethoxysilyl)propyl]diethylenetriamine was anchored onto Amazon kaolinite surface by heterogeneous route.