Adsorption-Precipitation Mechanisms for Cadmium Removal from Polluted water
Abstract
The subject of using inexpensive by-product material (cement kiln dust (CKD)) is considered attractive in terms of sustainable green development and eliminating cost of disposal. In the present study an extension for analytical sorption model derived by Sulaymon et al. (2016) was achieved for distinguishing between adsorption and/or precipitation mechanisms in the presence of CKD. This model was validated with the batch experimental measurements obtained for simulated water with pH of 3, agitation speed not less than 200 rpm and contact time either of 40 min for cadmium under different values of adsorbent dosage and contaminant concentrations. The developed model successfully described the isotherm relationship for total sorption (adsorption + precipitation) of cadmium with coefficient of determination equal to 0.90 where the precipitation has highest proportion (≥ 70%).
