Abstract
Abstract The adsorption behaviour and long-term stability of diphenoldichlorosilane (DPDSCI) coated zeolite was investigated in a column study by studying the toluene adsorption performance and material regeneration at various temperatures. Computer modelling (CXTFIT and MATLAB) was adapted to explore the adsorption mechanism, including the calculation of the axial dispersion coefficient and maximum adsorption capacity. The results indicate that DPDSCI coated zeolite presented a higher adsorption capacity towards toluene than that found in previous batch experiments. Under high flow rates, temperature had little influence on the adsorption behaviour. Regeneration tests prove that this material may be cleaned and reused at least three times without significant reduction in adsorption effectiveness. Axial dispersion studies show that transitional flow occurs during the adsorption process and is dominated by diffusion processes. Good agreement between experimental data and model prediction are achieved with an R2 value between 0.97 and 0.99 obtained for all tests. Overall, the column tests demonstrate DPDSCI coated zeolite may be suitable for the remediation of sites contaminated with hydrocarbons, even in cold regions and variable water flows.
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