Abstract
There are significant amounts of unused dyes remaining in wastewater from dyeing industry. The release of these effluents causes abnormal coloration of surface waters and there is a risk of toxicity. This research involved the efficient adsorption of anionic dyes (Coriacide Bordeaux 3B, Derma Blue R67, and Coriacide Brown 3J) used in tanning industry by local natural and treated clays; DD3 and KT2, a low-cost material abundant in highly weathered soils from Algerian East. The activated kaolins were characterized by chemical analyses, X-ray diffraction, and fourier transform IR scanning electron microscopy to obtain information about their structure and surface texture. The adsorption kinetics was investigated using the parameters such as contact time, clay nature, solution initial dye concentration, and acid activation. The adsorption capacity of all three dyes on local kaolinite clays exceeds 90% observed after 40–80 min. Compared with the adsorption experiments on Bentonite, the results show that kaolin has the best adsorption capacity for anionic dyes under the experimental conditions of this work.
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