Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı 2

Removal Of Reactıve Dye By Usıng Alum Sludge
Reactive dyes are widely used in textile industry due to their bright colors, excellent colour fastness and easy applicability. But most of the reactive dyes have toxic and carcinogenic effects. Removal of reactive dyes from waste water is difficult by conventional physicochemical treatment methods. Adsorption is an effective, simple, physical process for the removal of dyestuffs from waste waters. So adsorption proces is widely used technic for the removal of dyestuffs from waste waters.
In this study, the removal of Remazol Blue RR (RB) from aqueous solution by cationic surfactant-modified alum sludge and unmodified alum sludge was studied in a batch system. The surfactant used was hexadecyltrimethylammonium (HDTMA).
The effects of pH, contact time, initial dye concentration, adsorbent dose, salt effect, and temperature on the adsorption of RB onto modified and unmodified alum sludge were investigated. Langmiur, Freundlich, D-R isotherms, kinetic models and thermodynamic data were calculated with experiment results. The adsorption mechanism was described with FT-IR analysis at adsorption method. SEM-EDS analysis was used for the morphologic determinations. The surface area measurement was made for adsorbent characterization. Then removal efficiencies which are detected with kinetic experiments for textile industrial wastewater and synthetic wastewater was compared and was discussed each other.

It was determined depending on the results obtained after experiments that the optimum pH value was 2 for adsorption by alum sludge and 6 for adsorption by modified alum sludge. The optimum contact time was determined to be 90 min for alum sludge, 60 min for modified alum sludge. The adsorption capacities of alum sludge and modified alum sludge increased with increasing initial dye concentration, temperature and adsorbent dosage. The increasing value of salt concentration decreased the adsorption capasity of each both adsorbent. Kinetic studies showed that pseudo second order kinetic model well fitted than pseudo first order kinetic model to all the adsorbent samples.

At adsorban dosage of 30 g/L, contact time of 240 minutes and shaking speed of 150 rpm, the removal of RB from synthetic wastewater by using AS was found to be % 54.36 and adsorption capacity of AS was found to be 0.453 mg/g. On the other hand, at same experimental conditions with synthetic wastewater the removal of RB from textile wastewater by using AS was found to be % 49.4and adsorption capacity of AS was found to be 0.411 mg/g.
At adsroban dosage of 5 g/L,contact time of 240 minutes and shaking speed of 150 rpm the removal of RB from synthetic wastewater by using M-AS was found to be % 94.45 and adsorption capacity of M-AS was found to be 4.222 mg/g. On the other hand, at same experimental conditions with synthetic wastewater the removal of RB from textile wastewater by using M-AS was found to be % 73.98 and adsorption capacity of M-AS was found to be 3.699 mg/g.
Adsorption of RB on alum sludge was expressed better with Freundlich adsorption equation than D-R adsorption equation. Also, adsorption of RB using modified alum sludge was expressed better with Langmuir adsorption equation than the other.