Author(s):
1. Njegoš Repić, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
2. Nebojša Vasiljević, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
3. Vladan Micic, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina

Abstract:
In this work, the effect of temperature (15 – 45°C) and concentration of bleaching earth as an adsorbent (0.15 – 0.45 g/L) on the removal efficiency of methylene blue from water was investigated. The initial concentration of the dye was in the range of 10 – 20 mg/L, and the test was monitored at 9 given times, 2, 5, 9, 14, 20, 28, 39, 54 and 75 minutes. The greatest influence on the removal of the dye had the concentration of the adsorbent, because its increase increases the number of active sites. Thus, a removal efficiency of 75% is achieved after 75 minutes at 0.15 g/L of the adsorbent, while at 0.30 g/L the same effect is achieved after only 2 minutes. Increasing the temperature from 15 °C to 30 °C resulted in an increase in the efficiency due to an increase in the diffusion rate of methylene blue molecules, while a further increase to 45 °C did not significantly increase the efficiency because adsorption equilibrium was reached. Finally, it was observed that higher efficiency is achieved if the initial dye concentration is lower, because a high initial dye concentration leads to rapid saturation of the active sites.

Key words:
: bleaching earth, methylene blue, efficiency level,adsorption, bleaching earth, methylene blue, removal efficiency

Thematic field:
SYMPOSIUM C - Water

Date of abstract submission:
26.07.2025.

Conference:
Contemporary Materials 2025 - Savremeni Materijali

Applied paper from author