ADSORPTION OF METHYLENE BLUE FROM AQUEOUS ENVIRONMENT ON MODIFIED BENTONITES: ISOTHERMS AND THERMODYNAMICS

1. Rada Petrovic, Republic of Srpska, Bosnia and Herzegovina
2. Sanja Dobrnjac, Republic of Srpska, Bosnia and Herzegovina
3. Jelena Penavin-Škundrić, Prirodno-matematički fakultet Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Zorica Levi, Tehnološki fakultet Univerziteta u Banjoj Luci, Republic of Srpska, Bosnia and Herzegovina
5. Darko Bodroža, Republic of Srpska, Bosnia and Herzegovina
6. Mirko Petković, Republic of Srpska, Bosnia and Herzegovina
7. Trivo Stanković, Republic of Srpska, Bosnia and Herzegovina

The adsorption of methylene blue (MP) from the aqueous environment was examined on bentonite and on a series modified bentonites (Amcol and Tonsil modifications) in the temperature interval from 278 K to 303 K.
The balance isotherms applied on the system of aqueous solution MP/adsorbent are: Freundlich, Langmuir, Temkin isotherms. The calculated thermodynamic data provided an insight in the type of adsorption and spontaneity of the process itself depending on the experiment temperature.
The most important textural characteristics of bentonite were determined by the adsorption of nitrogen at the temperature of liquid nitrogen. The following was established: specific surface (SPBET), total volume of pores (Vp), most common value of pore diameter (Dmax) and mean value of pore diameter (Dmed).

Ključne reči: adsorption;methylene blue; Freundlich isotherm; Langmuir isotherm; Temkin isotherm; Dubinin Radushkevich isotherm

Tematska oblast: Teorijska i primijenjena hemija

Datum: 30.06.2016.

XI Savjetovanje hemičara, tehnologa i ekologa Republike Srpske

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