Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminum Polyhydroxocations by the Sol-Gel Method
Natural bentonite was modified with iron (III) and aluminum polyhy- droxocations by the sol–gel technique. This modification of natural bentonite has been found to cause changes in its chemical composi- tion, structural and sorption properties. The modified sorbents are fine-porous (nanostructured) objects with the predominance of 1.5–6.0 nm pore size. The specific surface area of our sorbents depends on the method of modification and the amount of the modifying component introduced (iron (III) or aluminum). The sorption capacity of the sorbents for permanganate anions was studied. The adsorption isotherms in this case are like Langmuir’s one by shape. The modification of bentonite with iron (III) and aluminum polyhydroxocations causes a significant increase in its sorption capacity for permanganate ions.
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