Remove of lead and cadmium metal ions from aqueous solution using nanoporous MCM-48 and modified NH2-MCM-48 adsorbents
Subject Areas : Environmental pollutions (water, soil and air)Hadi Vatandoust 1 , Habibollah Younesi 2 , Zahra Mehraban 3 , Ava Heidari 4
1 - MSc in Environmental Engineering, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran. * (Corresponding Author)
2 - Professor, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran
3 - - Assistant Professor, New Technologies Committee, Tehran, Iran.
4 - PhD in Environmental Engineering, Faculty of Natural Resourcesand Marine Sciences, Tarbiat Modares University, Noor, Iran.
Keywords: NH2-MCM-48, Cd (II), Pb (II), Adsorbent, Removal,
Abstract :
Background and Objective: In this study, nanoporous silica adsorbent of MCM-48 was synthesized. The adsorbent capacity of heavy metal was increased by modification of the surface with 3-aminopropyltrimethoxysilane. Silica adsorbents are very effective in heavy metal adsorption. Method: In the present study, removal of Pb (II) and Cd (II) heavy metal ions from aqueous solution was carried out using MCM-48 and NH2-MCM-48 modified nanoporous adsorbents in a batch system. The effect of adsorbent dosage, solution pH and contact time were studied. The equilibrium data were analyzed using the Langmuir and Freundlich isotherms by nonlinear regression analysis. Findings: The maximum adsorption capacities of NH2-MCM-48 for Cd (II) and Pb (II) were found to be 62.07 and 108.16 mg/g, respectively. Changing the level of each variable resulted in change of adsorption capacity of the adsorbents. Conclusion: The results of this study indicated that modification of MCM-48 to synthesize NH2-MCM-48 will increase the adsorbent capacity for Cd (II) and Pb (II) ions and this compound can be used as an effective adsorbent for the adsorption of metal ions.
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