Abstract
The adsorbent used in the study was the alumina obtained from the bauxite found in the locality of Milici, Siroki Brijeg and alumina synthesized in the laboratory and obtained by sedimentation from the solution of aluminium nitrate and concentrated ammonia along with controlling pH solution in the course of sedimentation. The obtained sediment of alumina was annealed for 4 hours at 273 K. The adsorbates were triphenylmethane dyes, carboxylic acids – acetic and lauric one and aqueous solution of ammonia. Alumina was modified by the surface active agents (SAA), cation-active SAA, triethanolamine-di-estermethylsulfate called Propagen, and anion-active SAA, Na-salt alkyldiglycoethersulfate called Genapol. The textural characteristics of adsorbents were determined by the adsorption of nitrogen from the gas phase at the temperature of liquid nitrogen, and the results of the adsorption of acid and base adsorbates gave an insight in the changes, i.e. characteristics of surface active centers on which the adsorption takes place
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