Abstract
The main purpose of this study is to synthesize new composites by incorporating bentonite into inorganic polymeric coagulants in order to make coagulation and cation removal from colloidal wastes simultaneous. Fourier transform-infrared (FT-IR) spectrometry and scanning electron microscopy (SEM) were used to study the characteristics of the synthesized composites. Adsorption tests for Pb+2 and Sr+2 removals were carried out as a function of contact time, pH, adsorbent dose, and initial cation concentration, and the optimum conditions were defined. The adsorption data were analyzed by Freundlich and Langmuir isotherm models. The data were well fitted by the Freundlich isotherm for strontium and by the Langmuir isotherm for lead. Thermodynamic studies showed that the adsorption process was endothermic and spontaneous. By using colloidal solutions containing lead and strontium, the jar test was conducted to evaluate the simultaneous coagulation-adsorption behavior of the composites. The results indicated that the polymeric iron and polymeric aluminum composites have the desired coagulation and adsorption properties.
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