This can be explained by the fact that at low values of the initial pH, the surface of the adsorbent would
be surrounded by the ions H+ inducing repulsive forces and hence decreasing the interaction of the ions of
the methylene blue with the sites of the adsorbent. Thus reduction in the adsorption rate at low pH values
of the pH can be due to the high concentration and the mobility of the ions H+ [22].
On the other hand at high pH, the concentration of H+ decreases and the total surface of the adsorbent
become negatively charged, enhancing the sorption of the ions dye, by means of electrostatic interactions.
The effect of pH on the removal percentage of methylene blue on ABP was showed above in the figure
(1.b) and table (2),the presentation indicate that the maximum value of the percentage was in the pH range
of (4-8), it was equal to 98.93%. It was marked that the effect of pH on the elimination rate of methylene
blue was perceived much more at 40 minutes of the contact time in this range of pH.
This can be explained by the fact that at low values of the initial pH, the surface of the adsorbent wouldbe surrounded by the ions H+ inducing repulsive forces and hence decreasing the interaction of the ions ofthe methylene blue with the sites of the adsorbent. Thus reduction in the adsorption rate at low pH valuesof the pH can be due to the high concentration and the mobility of the ions H+ [22].On the other hand at high pH, the concentration of H+ decreases and the total surface of the adsorbentbecome negatively charged, enhancing the sorption of the ions dye, by means of electrostatic interactions.The effect of pH on the removal percentage of methylene blue on ABP was showed above in the figure(1.b) and table (2),the presentation indicate that the maximum value of the percentage was in the pH rangeof (4-8), it was equal to 98.93%. It was marked that the effect of pH on the elimination rate of methyleneblue was perceived much more at 40 minutes of the contact time in this range of pH.
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