Abstract
AbstractWaste oyster shells cause great environmental concerns and cadmium is a harmful heavy metal. Therefore, in this study, the Taguchi method was applied for removing Cd(II) from aqueous solutions using oyster shell powders (OSP) to optimize the controllable factors, which included pH (P), OSP-calcined temperature (T), Cd(II) concentration (C), OSP dose (D), and contact time (t). The percentage contribution of each factor in descending order was P (57.01%) > T (23.35%) > C (9.10%) > D (5.85%) > t (1.92%). The optimum removal conditions were pH of 10 and an OSP-calcined temperature of 900°C, which resulted in a removal efficiency of 99.7%. At the higher OSP-calcined temperature of 900°C, more adsorption occurred due to the large number of porosities created, as evident from the scanning electron microscope (SEM) observations. These porosities generated a large number of cavities, which significantly increased the surface area for adsorption. Further, a multiple linear regression equation was developed ...
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