Hysteresis in sorption VIII

Summary

In a series of sorptions and desorptions of carbon tetrachloride at 30°C. on titania gel, a permanent hysteresis effect is obtained. The hysteresis loop has been reproduced in the twelfth cycle of sorption and desorption.

The reproducible hysteresis loop has been scanned. The general characteristics of the results on scanning are in conformity with those of other systems, titania gel-water, silica gel-water, alumina gel-water, silica gel-carbon tetrachloride, ferric oxide gel-carbon tetrachloride.

The hysteresis effect in sorption is caused by cavities in the porous adsorbent. The shape and size of the hysteresis loop are dependent upon the shape and size of the cavities and are independent of the nature of the adsorbate. The general characteristics of the results on scanning of the hysteresis loop are independent of the nature of the adsorbent and adsorbate. These characteristics are explainable only on the basis of the cavity concept.