ADSORPTION BEHAVIOR OF BASIC-DYES ON ACTIVATED CLAY

Activated clay was used to study the adsorption behavior of dyestuffs in synthetic wastewater containing dyestuffs. Three basic dyes were us ed: C.I. Basic Red 18 (or BR18), C.I. Basic Red 46 (BR46), and C.I. Ba sic Yellow 28 (BY28). Adsorption occurred almost instantaneously upon contact. The mechanism of adsorption was explained by a charge to the electrostatic attractive force described in the Langmuir adsorption is otherm. The mass transfer coefficient was also calculated by the exter nal mass transfer model in an adsorbent according to Mckay et al. Para meters including species of basic dyes, initial concentration, tempera ture, size of adsorbent, and NaCl were extensively investigated.