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Type: Artigo de periódico
Title: Zirconium Phosphate Dispersed On A Cellulose Fiber Surface: Preparation, Characterization, And Selective Adsorption Of Li+, Na+, And K+ From Aqueous Solution.
Author: Borgo, Claudemir A
Gushikem, Yoshitaka
Abstract: Highly dispersed zirconium phosphate was prepared by reacting Cel/ZrO(2) (ZrO(2)=6.7 wt%; 0.56 mmol g(-1) of zirconium atom per gram of the material) with phosphoric acid. High power decoupling magic angle spinning (HPDEC-MAS)(31)P NMR and X-ray photoelectron spectroscopy data indicated that HPO(2-)(4) is the species present on the fiber surface. The X-ray diffraction patterns showed that zirconium hydrogen phosphate particles were amorphous and had an ion-exchange capacity, determined by ammonia gas adsorption, of 0.30 mmol g(-1). The ion-exchange capacities for Li(+), Na(+), and K(+) ions were determined from ion-exchange isotherms at 298 K and showed the following values (in mmol g(-1)): Li(+)=0.01, Na(+)=0.23, and K(+)=0.30. The higher affinity of the surface hydrogen phosphate particles for Na(+) and K(+) is due to its lamelar structure which permits easier diffusion of these two ions whose hydrated radii are smaller than that of Li(+).
Subject: Adsorption
Cations, Monovalent
Rights: fechado
Identifier DOI: 10.1006/jcis.2001.8045
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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