Adsorption of Cd and Cr from Industrial Wastewater using Kaolin

M. K. Yahaya, M. A. Abdulazeez, S. Abdulsalam

Abstract


This work was undertaken to develop a cost-effective biosorbent and to study the biosorption process involved in the adsorption of Cd and Cr ions from simulated industrial wastewater using the prepared kaolin. The prepared kaolin was characterised by its functional groups using Fourier Transform Infra-Red Spectroscopy (FTIRs). The efficiency of the adsorbent was evaluated by measuring the extent of adsorption of Cd and Cr (II) ions in the simulated industrial wastewater. Operational parameters such as contact time, stirring speed and adsorbent dosage were studied. The FT-IR spectrum of the kaolin shows peaks at 3447, 1634, 1469, 1097/462 and 576 cm-1 attributed to the O–H stretching, H–O–H bending, Si–O–Si groups of the tetrahedral sheet, Al – O bending and stretching vibration of Si – O respectively. Adsorption data fitted well with the Freundlich and Jovanovic models. However, the Jovanovic isotherm displayed a better fitting model than Freundlich isotherm because of the higher correlation coefficient and lower standard error that the former exhibited, thus, indicating that the adsorptions of Cd and Cr metal ions in this work can be said to have taken place more on homogenous site with monolayer coverage of metal ions on the outer surfaces of the adsorbents along with some mechanical contacts between the metal ions and the adsorbent with competition for binding sites among the metal ions. Using kaolin as an adsorbent implies the availability of abundant and less expensive natural materials for treating wastewater.


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