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Removal of cadmium from wastewater by polyelectrolyte coated industrial waste fly ash

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Document pages: 13 pages

Abstract: Fly ash (FA) is a major industrial waste generated by power stations, which increases the additional cost for proper disposal. Therefore, recent research work has focused on developing methods for the use of FA in environmentally sound applications. Therefore, this study investigated the potential ability of raw fly ash (RFA) and polyelectrolyte coated fly ash (pefa) to remove cadmium (CD) from polluted water. 0.03 (V V) cationic polydiallyl dimethyl ammonium chloride (PDADMAC) and anionic polystyrene sulfonate (PSS) solution were coated on functionalized fly ash for 20 layers by layer method. The surface morphology and chemical composition of adsorbent (pefa) were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and Fourier transformsform Infrared (FTIR), and X-Ray Fluorescence (XRF) techniques. The effects of pH, adsorbent dosage, contact time, initial contaminant concentration, and mixing rate of the adsorption of Cd were also studied in batch mode experiments. Results of the study revealed that a 4.0 g L dosage of PEFA removed around 99 of 2.0 mg L of Cd in 15 min at 150 rpm compared to only 27 Cd removal achieved by RFA under the same conditions. Results also showed that adsorption by PEFA followed both Langmuir and Freundlich models with correlation coefficients of 98 and 99 , respectively.

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