application of modified nanoclay sorbent for separation and preconcentration trace amount of cobalt

Authors

d. afzali

z. biniaz

a. mostafavi

abstract

the present article reports on the application of modified organo nanoclay as a green, easily prepared and stable solid sorbent for the preconcentration of trace cobalt ion in aqueous solution. the organo nanoclay was modified by adsorption of 5-(4-dimethyl amino-benzylidene) rhodanin reagent onto it. the sorption of co2+ ions was quantitative in the ph range of 7.0 to 8.5, whereas quantitative desorption occurs instantaneously in 5.0 ml of 2.0 mol l-1 hno3. the eluted solution was aspirated directly into the flame of atomic absorption spectrometry (faas). linear range for determination of cobalt was maintained between 0.176 ng ml-1 to 15.0 μg ml-1 in initial solution. relative standard deviation for ten replicated determination of 1.0 μg ml-1 of cobalt was ±2.34% . detection limit was 0.1 ng ml-1 in initial solution (3sbl, n=10) and preconcentration factor was 170. the sorption capacity of modified nanoclay for co (ii) was evaluated 0.56 mg per g of sorbent. the effects of the experimental parameters, including the sample ph, flow rates of sample and eluent solution, eluent type,  breakthrough volume and interference ions were studied for preconcentration of co2+. the proposed method was applied for determination of cobalt in water samples.

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Journal title:
international journal of nanoscience and nanotechnology

Publisher: iranian nano society

ISSN 1735-7004

volume 7

issue 1 2011

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