Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 75, Issue 6, Pages 726-731Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2014.01.016
Keywords
Oxides; Chemical synthesis; Surface properties
Funding
- National Natural Science Foundation of China [21103017, 51104042]
- Fundamental Research Funds for the Central Universities [110405007]
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Surface-functionalized zinc oxide (ZnO) nanoparticles were synthesized with ethylene diamine tetraacetic acid (EDTA) as a modification agent, which were used as adsorbents in the adsorption of Cu2+ at certain conditions. The transmission electron microscopy (TEM) results show that the average size of ZnO particles is about 45 nm, and it exhibits hexagonal wurtzite structure. Fourier transform infrared (FTIR) spectra reveal that the EDTA species are chemically bonded on the surface of ZnO. Compared with bare ZnO particles, the functionalized ZnO nanoparticles have a better activity in the Cu2+ adsorption. The maximum adsorption capacity of functionalized ZnO nanoparticles is 20.97 mg/g, while it is 17.93 mg/g for the bare ZnO. The adsorption isotherm of bare ZnO particles is in accordance with the Freundlich model, and the chemical adsorption is in a dominant position in the adsorption process of Cu2+ on functionalized ZnO particles. (C) 2014 Elsevier Ltd. All rights reserved.
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