Solid Phase Extraction of Trace Amount of Vanadium V by Nanometer-sised Zirconium DioxideReportar como inadecuado




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A new and simple method using nanometer-sized ZrO2 as a solid phase extractant coupled with spectrophotometry was proposed for determination of trace vanadium. The nanometer-sized ZrO2 was prepared through sol-gel method. The adsorption behavior of nanometer-sized ZrO2 towards V V was investigated by spectrophotometry, and the adsorption pH curve, adsorption capacity were obtained. It was found that the fraction of adsorbed VV was more than 98.5% under pH 4.0, and 0.4 mol L-1 NaOH was sufficient for complete elution. Nanometer-sized ZrO2 possesses a significant capacity 48.4 mg g-1 for the adsorption of V V that is higher than that of those commonly used extractant, such as silica and nanometer-sized TiO2. The fraction of V V absorbed on recycled nanometer-sized ZrO2 still reached quite a high level, which showed that the nanometer-sized ZrO2 was reusable in practice. The study on interference of co-existing ions indicated that ZrO2 had high selectivity for vanadium ions. The method was applied to preconcentration of trace vanadium V in water samples with satisfactory results.

KEYWORDS

Nanometer-sized ZrO2; Adsorption; Vanadium; Preconcentration

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Autor: Dezhong Yu, Sisi Wang, Qijin Wan

Fuente: http://www.scirp.org/



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