Akademik Veri Yönetim Sistemi
Reviews in Chemical Engineering, cilt.15, sa.4, ss.349-362, 1999 (SCI-Expanded)
The removal of organic contaminants from wastewater has been studied by using hexadecyltrimethylammonium bentonites (HDTMA-bentonites) having different cation exchange capacity (CEC). HDTMA-bentonites were synthesized by placing quaternary ammonium surfactant (hexadecyltrimethylammonium bromide) on Cankiri sodium bentonite (CNa-B) having 85 meq/100 g clay, Kutahya calcium bentonite (KCa-B) having 65 meq/100 g clay and Cankiri calcium bentonite (CCa-B) having 47,5 meq/100 g clay by cation exchange. The sorption of organic pollutants was examined by batch equilibration method at 25°C. As organic contaminants, polar compounds (methylene blue, benzoic acid and salicylic acid) and nonpolar compounds (toluene and xylenes) were used. The concentrations of the organic pollutants used ranged from 0 to 700 mg/L. Methylene blue, benzoic acid and salicylic acid sorptions to HDTMA-bentonites were characterized by relatively strong solute uptake. Toluene and xylene sorptions to HDTMA-bentonite were weaker. The effectiveness of HDTMA-bentonites increased with CEC. It is concluded that high CEC HDTMA bentonite was a highly effective adsorbent for removing salicylic acid, benzoic acid and methylene blue.