The removal of zinc ions from their aqueous solutions by Cr2O3 nanoparticles synthesized via the UV-irradiation method | ||||
| Egyptian Journal of Chemistry | ||||
| Article 6, Volume 63, Issue 2, February 2020, Page 425-431 PDF (1.91 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2019.17003.2042 | ||||
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| Authors | ||||
Mahdi Ahmed Mohammed   1; Ahmed Mahdi Rheima 2; Shaimaa Hamed Jaber3; Shahad Abbas Hameed4
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| 1Physics department, science college, Wasit university, Al Kut, Iraq | ||||
| 2Chemistry department, science college, Wasit university, Al Kut Iraq | ||||
| 3Chemistry department, science college, Al- Mustansiriyah university, Baghdad, Iraq | ||||
| 4Chemistry department, science collage, Wasit university, Al Kut, Iraq | ||||
| Abstract | ||||
| A modification of an UV-irradiation method is used to synthesis of Cr2O3 nanoparticles. It is a simple and easy way to produce small particles of chromium oxide at a range of 2 – 30 nm according to the transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterizations. In this study, the synthesized nanoparticles are used as an adsorbent for zinc ions from their aqueous solutions under effect of different temperatures 15, 25, 35, 45 and 55 oC. The adsorption process of zinc ions is endothermic (ΔH is 10.33 kJ/mol ) and its data fitted well with the Freundlich isotherm model (R2=0.9601). The data of adsorption show non-spontaneously in nature when the thermodynamic parameter ΔG is positive (1.515 kJ/mol). However, the ΔG changes to a negative value with the temperature rising and the process begins spontaneously because the adsorption capacity increases with increase in temperature. | ||||
| Keywords | ||||
| Cr2O3 nanoparticles; chromium oxide; UV-irradiation; zinc ion; Adsorption | ||||
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