Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, -, Turkey
Approval Date: 2008
Thesis Language: Turkish
Student: YASEMİN ERCAN
Supervisor: NAİL YAŞYERLİ
Open Archive Collection: AVESIS Open Access Collection
Abstract:In this study, the adsorption behaviour of 1,2-dichloroetane, 1,1,1-trichloroetane and carbontetrachloride on natural halloysite clays, which were taken from Bilecik and Kahramanmaras region, were investigated by using one sided single pellet moment technique in dry and humid medium. In the interpretation of zeroth moments analysis of tracers used, irreversible adsorption has been observed for 1,2-dichloroethane and 1,1,1-trichloroethane; and reversible adsorption has been observed for carbontetrachloride. Adsorption equilibrium and adsorption rate constants, effective diffusivities of tracers were calculated by the use of first absolute and second central moment expressions. In dry medium, for clay which was taken from Bilecik zone, adsorption rate constants (rpka) for 1,2-dichloroetane, 1,1,1-trichloroetane were evaluated as 1,29x104 s-1 ve 1,08x104 s-1; effective diffusivies for these tracers were found as 0,020 cm2/s and 0,019 cm2/s recpectively. For carbontetrachloride; adsorption equilibrium constant (rpKi) was found as 2,57 and effective diffusivity for this tracer was evaluated as 0,035 cm2/s. For the other clays from Kahramanmaras zone, adsorption rate constants for 1,2-dichloroetane and 1,1,1-trichloroetane tracers were found as 1,39x104 s-1 and 1,03x104 s-1, adsorption equilibrium constant was calculated as 1,36 for carbontetrachloride tracer. Effective diffusivities for all these tracers were evaluated as 0,028 cm2/s, 0,024 cm2/s and 0,009 cm2/s, respectively. In the second part of the experiment, the natural halloysit, which was taken from Bilecik, was humidified in the range of 20 % to 80 % humidity. Reversible adsorptions have been observed for all tracers. For the 20 % relative humidity, adsorption equilibrium constants for 1,2-dichloroetane, 1,1,1- trichloroetane and carbontetrachloride were calculated as 2,66, 1,96 and 2,24. For the 80 % relative humidity, adsorption equilibrium constants were evaluated as 0,85, 0,62 and 0,68 respectively. Decrease in the adsorption equilibrium constant and effective diffusivity was observed with an increase in relative humidity.