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Remediation of metal ions in aqueous solution using activated carbon from Zea mays stem

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dc.contributor.author Matandabuzo, Mzukisi
dc.date.accessioned 2017-10-26T09:58:41Z
dc.date.available 2017-10-26T09:58:41Z
dc.date.issued 2016
dc.identifier.uri http://hdl.handle.net/20.500.11837/972
dc.description.abstract Zea mays stem and its activated carbon were prepared through chemical activation method using four different activating reagents (NaOH, H₃PO₄, H₂SO₄, KOH) and were used as adsorbents for the removal of Pb(II), Cu(II), Hg(II) and Cr(III) from aqueous solution. The results shows that activated carbon has high surface area and pore volume compared to the powdered raw Zea mays stem. Prepared activated carbon was characterized using physico-chemical properties such as carbon yield, iodine number, moisture content, percentage adsorption, and analytical instruments such as Fourier transform Infrared spectroscopy (FTIR), atomic absorption spectrometer (AAS), scanning electron microscopy (SEM), Energy Dispersive X-ray analysis (EDS), powder X-ray Diffraction (pXRD). The adsorption of Pb(II), Cu(II), and Cr(III) ions were pH, contact time, and concentration dependent. Based on the results obtained from the batch experiments, activated carbon prepared from Zea mays stem is not good enough for the removal of Hg(II) from aqueous solution. Adsorption ability was calculated and found to be 66.67 percent for activated carbon obtained from H₂SO₄, 21.21 percent for activated carbon obtained from KOH, and 20 percent for activated carbons obtained from NaOH and H₃PO₄. The pH 5-6 was chosen for all experiments, contact time was 2 hours, and adsorbent dosage was 2 g, initial concentration range from 200, 400, 600, 800, and 1000 ppm at room temperature. The metal ion removal trend was found in the order Pb(II)>Cu(II)>Cr(III)>>Hg(II). The Langmuir model fitted well in most of the cases with R2> 0.99. Consequently, the adsorption of Pb(II) and Cu(II) followed Langmuir isotherm model while that of Cr(III) best fitted the Freundlich isotherm model. The results indicated that the adsorption process followed two possible mechanisms. (I) Metal ion – adsorbent complex model and (II) Metal ion – ion-exchange adsorbent complex model. en_ZA
dc.language.iso en en_ZA
dc.publisher University of Fort Hare en_ZA
dc.subject Water -- Purification -- Materials en_ZA
dc.subject Groundwater -- Purification en_ZA
dc.subject Heavy metals -- Environmental aspects en_ZA
dc.subject Environmental chemistry en_ZA
dc.title Remediation of metal ions in aqueous solution using activated carbon from Zea mays stem en_ZA
dc.type Thesis en_ZA

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