Aq. 6.25-8.51 g(as Al(3+))/ml. AlCl(3) and NH(4)OH were intermixed, each 6.8-9.2 ml./min for 1 hr. at 90 degrees C. The resulting gel was kept 5 hr./90 degrees C in the mother liquor, mixed with 30% of atactic polypropylene (APP) or 30% of petrochem. waste floatate hydrocarbons, and pyrolyzed 450 degrees C/30 min. in N(2) to yield sorbents 197-270 m(2)/g in sp. area. The sorbents were studied in adsorption of H(2)O and C(6)H(14) vapors and thermal desorption using TG, DTG, and DTA methods. Sorbent prepn. history affected C coverage homogeneity. copptn. of the matrix with the hydrocarbons gave most homogeneous C pyrolyzate coat: the sorbent was entirety hydrophobic, active in waste treatment and its range of mesopores was expanded. Incomplete coverage resulted in a hydrophilic-hydrophobic nature of the surface.