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Erschienen in: Clean Technologies and Environmental Policy 6/2015

01.08.2015 | Original Paper

Modified ZnO nanoparticles with new modifiers for the removal of heavy metals in water

verfasst von: Shahriar Mahdavi, Abbas Afkhami, Hajar Merrikhpour

Erschienen in: Clean Technologies and Environmental Policy | Ausgabe 6/2015

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Abstract

We prepared novel ZnO nanoparticles (NPs) modified with humic acid (Zn-H), extractant of Walnut shell (ZN-W) and 1,5 diphenyl carbazon (Zn-C). Three modified nanoparticles (MNPs) were characterized by SEM, XRD, FT-IR spectra, and EDX analysis. The images showed that Zn-H, Zn-W, and Zn-C particles had mean diameters of about 52, 56, and 76 nm, respectively. We explored the ability of the MNPs for removing heavy metal ions (Cd2+, Cu2+, and Ni2+) from aqueous phase in single and multiple solutions. Based on the average metal removal by the three NPs, the following order was determined for single and multiple component solutions: Cu2+ > Cd2+ > Ni2+. We investigated the adsorption capacity of MNPs as a function of contact time, pH, and metal ions concentration (isotherm). Among different isotherm models, it was found that the Langmuir model showed better correlation with the experimental data than Freundlich model. Spectroscopic analyses such as SEM–EDX and saturation indexes have been investigated to study the mechanism of sorption of metal ions by MNPs. The high adsorption capacities of the MNPs shown from the results make them promising candidates for removal of the tested heavy metal ions.

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Metadaten
Titel
Modified ZnO nanoparticles with new modifiers for the removal of heavy metals in water
verfasst von
Shahriar Mahdavi
Abbas Afkhami
Hajar Merrikhpour
Publikationsdatum
01.08.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Clean Technologies and Environmental Policy / Ausgabe 6/2015
Print ISSN: 1618-954X
Elektronische ISSN: 1618-9558
DOI
https://doi.org/10.1007/s10098-015-0898-9

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