キレート剤としての粉末状ヒドロキサムセルロースの作製とその性質

概要

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The carboxy-cellulose containing about 6 wt. % of carboxyl group was prepared at room temperature from cellulose powder (Toyo Roshi, 100200 mesh) by using nitrogen dioxide as the oxidant. And then the carboxy-collulose was hydroxamized with an hydroxylamine ethanol solution at room temperature. The mole ratio of hydroxylamine to carboxyl group was kept at 10 to 1. The hydroxamized product, called hydroxamic cellulose powder (“H-cell”) is a chelating cation exchanger based on cellulose having hydroxamic acid groups. From the results of nitrogen analysis, diffuse reflectance spectrography and sorption behavior of iron(III) on the H-cell, it can be concieved that the hydroxamic acid groups were introduced into anhydroglucose units in the cellulose molecule. The effect of pH and contacting time on the collection of iron(III) were investigated by applying 100 mg of H-cell for 50 m<I>l</I> of solution (Fe, 0.010.1 ppm). The H-cell was found to be more effective collector for trace amounts of iron(III) than a carboxy-cellulose. Hence, the H-cell was applied satisfactorily for the removal of iron(III) which was the contaminant of different solutions.
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