Abstract
The intention of this study was to explore the efficacy and feasibility for Cu (II) adsorption onto fixed bed column of maize tassel-PVA beads. The effects of flow rate and bed height were explored. The Thomas, Adams and Bohart and Yoon-Nelson models were analysed to evaluate the column adsorption performance. The adsorption rate constant and correlation coefficient associated to each model for column adsorption was calculated. Thomas model indicated that increase in column height and flow rate increased the values of k Th and q o . Thereafter, the value of q o decreased with decreasing bed height. With Adam-Bohart model, the values of kAB increased as the flow rate and the bed height increased and continued to increase with decrease in bed height. However, the value of N o first increased with increase in flow rate and bed height, but later decreased with decrease in bed height. This suggests that the overall system kinetics may have been influenced by external mass transfer, particularly in the initial part of adsorption in the column. In the case of Yoon-Nelson model, the rate constant k YN and τ increased with increase in bed height and flow rate. However, decrease in bed height at a flow rate of 2.33 × 10 -3 L min -1 resulted in an increase in τ while the values of k YN decreased. The three models gave high values of R2 (0.9694-0.98920), although the Adam-Bohart model values were, on average, the least. Therefore, it can be said that both the Thomas and Yoon-Nelson models describe the behavior of the adsorption of Cu (II) in a fixed-bed column better than Adam-Bohart.
Highlights
Effective removal of trace metal ions from aqueous solution is important in order to protect the environment and to improve the quality of public health
We reported the potential of maize tassel to remove trace metals from aqueous solution, physicochemical characterisation of the tassel for texture, microstructure, elemental composition and thermal stability [8]
The beads formed from the immobilization of powdered maize tassel in polyvinyl alcohol matrix were reasonably spherical in shape, and their diameters were in the range of 5.50 ± 0.48 mm
Summary
Effective removal of trace metal ions from aqueous solution is important in order to protect the environment and to improve the quality of public health. Trace metals such as mercury, lead and cadmium are not biodegradable and are known to bio-accumulate in the food chain. The removal of trace metals from the environment, from water, is very important since water is one of the most valuable natural resources. Copper is an essential element in mammalian nutrition as a component of metallo enzymes in which it acts as an electron donor or acceptor. The study of removal of copper ions in aqueous system is essential
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