Adsorption Studies of Lead on Modified Mesoporous Al-MCM-41

In this paper, the sorption of lead on modified mesoporous aluminosilicate was studied. The effect of pH, contact time, initial concentration of lead on sorption was investigated. The distribution coefficient of lead ion on the mesoporous aluminosilicates has been enhanced with the increase of the aluminum in the framework of the adsorbent. Adsorption behavior of lead on the Al20MCM-41 adsorbents has been studied and the Langmuir and Freundlich isotherms were applied to represent the adsorption process. The Langmuir equation provides a better fiting than the Freundlich one. The Langmuir monolayer capacity of the sorbent was 14.6 mg.g-1. The adsorption capacity is very high in the pH range of 3-7 and decreases with decreasing of the pH value.