Adsorpcja benzenu i chloroformu z fazy gazowej na adsorbentach mineralnych i węglowych

The adsorption properties of mineral adsorbents modified with sulfuric acid and potassium hydroxide were studied and compared to those of active carbons by using benzene and chloroform vapors. Experimental adsorption isotherms of ben-zene and chloroform at 25°C were measured using the volumetric method of liquid microburetes. It is shown that due to the lack of fine pores (micropores) the adsorption on mineral adsorbents in the range of low relative pressures is from one-half to one-third that on active carbons. However, both types of adsorbents show similar adsorption at relative pressures close to unity. Mineral adsorbents which are lacking in micropores possess mainly mesopores, i.e., pores of sizes between 2 nm and 50 nm. Therefore, these adsorbents show quite good adsorption properties in the range of moderate and high relative pressures. The total volume of micro- and mesopores in active carbons is close to the volume of mesopores in mineral adsorbents. It is shown that an effective method for modifying the mesoporous structure of mineral adsorbents is their chemical treatment with sulfuric acid. However, the basic treatment of the aforementioned mineral adsorbents does not lead to significant improvements of their porous structure. It seems that mineral adsorbents may be useful for the removal of organic compounds from the gas phase.