PRECONCENTRATION AND DETERMINATION OF PB (II) IN AQUEOUS SAMPLES USING FUNCTIONALIZED DOWEX 1X8

被引：4

作者：

Jan, Mohammad Rasul ^{[1
]}

Shah, Jasmin ^{[1
]}

Sadia, Maria ^{[1
]}

Atta-ul-Haq ^{[1
]}

机构：

[1] Univ Peshawar, Inst Chem Sci, KHYBER PUKHTOONKHWA, Pakistan

来源：

SOLVENT EXTRACTION AND ION EXCHANGE | 2012年 / 30卷 / 03期

关键词：

Preconcentration; adsorption; functionalized resins; Pb (11) determination; Dowex; 8-hydroxy quinoline; ATOMIC-ABSORPTION-SPECTROMETRY; SOLID-PHASE EXTRACTION; LIQUID-LIQUID-EXTRACTION; CLOUD POINT EXTRACTION; ONLINE PRECONCENTRATION; TRACE-ELEMENTS; BIOLOGICAL SAMPLES; MASS SPECTROMETRY; ACTIVATED CARBON; WATER SAMPLES;

D O I：

10.1080/07366299.2011.609386

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Synthetic resin Dowex 1X8 was functionalized with alpha-Nitroso beta-Naphthol (Dowex-alpha N beta N) and with 8-Hydroxy Quinoline (Dowex-8HQ) to form chelating resin. The resultant chelating resins were characterized using scanning electron microscopy (SEM), thermo gravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR). The efficiency of these resins for the removal/preconcentration of Pb (II) from aqueous samples was evaluated. Optimum conditions of pH, time of equilibrium, and sample volume were investigated for maximum retention of Pb (II) from aqueous solutions. At optimum conditions, 100% adsorption was observed for the functionalized resins. Both Freundlich and Langmuir isotherms were applied to the adsorption data and it was observed that data fits well to Langmuir isotherm. Various parameters such as shaking time, type, and concentration of eluents were investigated for the recovery of Pb (II) from the chelating resins. For Dowex-alpha N beta N and Dowex-8HQ, 100% recovery with a preconcentration factor of 100 was achieved with 0.5 and 2 M HCl, respectively. The selectivity and specificity of the functionalized resins was also evaluated by studying the effect of various foreign ions and the results have been compared with the unmodified Dowex.

引用

页码：306 / 319

页数：14

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