Freundlich Isotherm Model of Adsorption of Fe2+ ,Co2+ and Cr3+ IonsfromAqueous Solution Using Activated Carbon Prepared from

Corn Maize(Zea mays .ssp) Waste

Chemical and physical properties of Activated Carbon(AC-C) prepared from Corn Maize (Zea mays L.ssp)

waste were determined and the adsorption characterization of Fe2+, Co2+ and Cr3+ from aqueous solution

with respect to Freundlich isotherm and adsorption kinetics were investigated.

AC-C was prepared using chemical activation with Potassium Hydroxide (3M at 600 °C for 1 hr).

The characterization of (AC-C) revealed that it has 49.42% carbon, 4.2% ash, bulk density of

(0.75 g/ml); porosity (57.08%) and methylene blue of 190.6 mg/g. Kinetic adsorption of metal ions

(Fe2+, Cr3+ and Co2+) has also been investigated at isotherm container at 30°C. The effect of dose of (AC-C)

on the percentage removal of metals indicates that the maximum dose of adsorbent was

at concentration of 0.8 g/L in which 10% Fe2+ was removed. For Fe2+ and Cr3+metal ions,

the adsorption decreases as the pH increases. The optimum pH for the adsorption was 6 for both

Cr3+ and Co2+and 7 for Fe2+. The experimental isotherm data was analyzed using Freundlich equations.

The adsorption process follows the Freundlich order kinetic, with a correlation coefficient (R2) of

0.97 for both Fe2+and Co2+ and 0.96 for Cr3+. Adsorption capacity (K) and the adsorption intensity (1/n)

were the highest for Fe2+, with the values of 1.83 and 1.41, respectively.

Other adsorption factors such as detection of inorganic elements and functional groups on

the (AC-C) sample were examined by XRF, XRD and FT-IR spectroscopy. The major elements in the sample were:

Potassium (0.047%) and Calcium (3.66%). The FT-IR spectra indicate the presence of five functional groups;

2511 cm-1corresponds to a carboxylic O-H stretching, 1794 cm-1corresponds to an acid anhydride C=O stretching,

1454 cm-1corresponds to aromatic C-H stretching,874 cm-1is associated with the out of plane C-H wagging

and 704 cm-1is in plane C=C bending.

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