Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent

What is it about?

The azo dye and plant-derived sorbent system was investigated in this paper. Direct Orange 26 azo dye was acquired from Boruta-Zachem Kolor Sp. z o. o. Chemically modified granulated corncobs obtained from Chipsi Mais Germany were used as the biosorbent. The changes in the dye and sorbent concentrations with time were measured and used for further calculations. The experiments were carried out in a laboratory fixed bed column. Breakthrough curves were plotted for different initial concentrations, volumetric flow rates and bed heights. Sorption dynamics was described by a model presented in the literature. It was demonstrated that Infrared analysis of the system allows to determine the nature of the dye-sorbent bond. It was found that corncobs can be used as a promising sorbent material.

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Why is it important?

In this paper, adsorption of Direct Orange 26 azo dye onto a plant sorbent ie granulated corncobs was analysed. After initial studies with raw and boiled cobs, further experiments involved cobs which had been chemically pretreated with a view to increasing their sorption capacity. Experiments were carried out to determine sorption kinetics and equilibrium based on the changes of dye concentration in the solution and in the sorbent. The primary goal of the study were sorption dynamics experiments conducted in the column packed with a modified sorbent. The parameters analysed were: sorbent-dye solution contact time, bed breakthrough and saturation time. Based on the data obtained, the efficiency of Direct Orange 26 azo dye removal was determined for different process parameters. The results were described mathematically using a model proposed in the literature that describes the change in the amount of dye adsorbed on the bed in the column q [mg/g] based on the obtained breakthrough curves, ie C = f(t).

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