modified bentonite as adsorbent material for the removal of the basic dye methylene blue from aqueous solutions

Methylene blue is an organic pollutant found in industrial effluents that is very toxic tohumans and the environment. this study used 8-hydroxyquinoline-modified bentoniteadsorbent to remove methylene blue from aqueous solutions. in the present work,different doses of modified bentonite were used as a new adsorbent for the removal ofmethylene blue. the effects of contact time, ph, adsorbent dose, and initial methyleneblue concentration were recorded. then, the adsorption data were described withlangmuir and freundlich adsorption isotherms. the highest percentage of methylene blueadsorption was observed at ph = 7.5. the optimum amount of adsorbent was 0.1 g.l^-1 andafter 120 minutes, the process reached an equilibrium state. the adsorption of methyleneblue increased following an increase in the ph of the solution. it was also observedthat the contact time significantly affected the rate of methylene blue adsorption. theexperimental data fit much better in the freundlich (r^2 = 0.999) model than the langmuir(r^2 = 0.992) model. so, 8-hydroxyquinoline-modified bentonite has the potential tobe utilized for the cost-effective removal of methylene blue from aqueous solutions.