Abstract
It is generally known that zeolite has potential for heavy metal adsorption. The objectives of this study were to synthesize and characterize zeolite ZSM-5 and to figure out the adsorption capacity of zeolite ZSM-5 for heavy metals of Cu2+, Pb2+ and Cd2+. Characterization of zeolite ZSM-5 included some variables i.e. crystal structure (XRD), morphology (SEM), specific surface area and total pore volume (N2 physisorption). Adsorption capacity of zeolite ZSM-5 was analysed using a batch system with heavy metals of Cu2+, Pb2+ and Cd2+ in various concentrations (50, 100, 150, 200 and 250 ppm) with contact times 30, 60, 90, 120 and 250 minutes. Adsorption data was calculated by Langmuir and Freundlich isotherm. The results showed that the maximum adsorption capacity of zeolite ZSM-5 against heavy metals of Pb2+, Cu2+, and Cd2+, were 74.07, 69.93 and 60.24 mg g-1, respectively. These indicated that synthetic zeolite ZSM-5 had potential to adsorb heavy metals. The results also suggested that the adsorption capacity was affected by the pore size of zeolite, negative charge of zeolite, diameter of hydrated and electronegative ion.
Highlights
IntroductionThe high level of metal pollution by heavy metal such as Cu, Pb, Cd, Hg, Zn, and Ni is a part of the most important global issue
Heavy metal pollution is a phenomenon that cannot be detached from daily life
Synthetic zeolite was successfully made by non-hydrothermal method
Summary
The high level of metal pollution by heavy metal such as Cu, Pb, Cd, Hg, Zn, and Ni is a part of the most important global issue. These metals may become a problem if they get into ecological system and the human health. Zeolite is a silicate alumina crystal with three dimension framework structure formed by tetrahedral silicate [SiO4]4- and octahedral alumina [AlO4]5- that bundled by oxygen atom. Silicon atom is surrounded by 4 oxygen atoms to construct networks with regular pattern. In some spots in these networks, silicon atom is substituted by aluminum,
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