Professor Werner Fischer 2um 60. Geburtstage gewidmet Inhaltsiibersicht Es wurden zwei Methoden entwickelt, um das aus einer waDrigen Losung an einem festen Adsorbens ,,sorbierte" Wasser zu bestimmen. Die ,,ffassersorption" an y-Al,O, aus reinem Wasser entspricht etwa einer Bcdeckung der Oberflache mit zwei Molekiillagen H,O. Aus verdiinnten Elektrolytlosungen wird bis zur dreifaehen Menge H,O sorbiert. Bei hoherer Elektrolytkonzentration nimmt die Wassersorption linear mit zunehmender Ionenadsorption wieder ab, soweit Kationen und Anionen in annahernd aquivalenter Menge gebunden werden. Zusatzlich durch Austausch gegen Al"+-Ionen gebundene Kationen sind ohne EinfluB auf die Wassersorption.
SummaryTwo methods have been developed in order to determine the water sorbed to a solid adsorbent out of an aqueous solution. The sorption of water to y-Al,O, out of pure water corresponds approximately to a two-molecular layer of H,O on the surface. Up to three times as much water is sorbed out of a weak solution of electrolytes. With higher concentrations of electrolytes, the water sorption decreases linearly with increasing ion adsorption, so far as cations and anions are bound in approximately equivalent amounts. Cations additionally bound because of exchange with Als+-ions do not influence the w-ater sorption.
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