Characterization and adsorptive capacity of coal fly ash from aqueous solutions of disperse blue and disperse orange dyes
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Discharge of colored industrial effluents into water bodies poses environmental risks to aquatic life. Coal fly ash (CFA) was used as an adsorbent for removal of disperse blue and disperse orange dyes from aqueous solutions. The surface morphology of CFA was characterized using scanning electron microscopy–energy dispersive X-ray and particle size was characterized by particle size analyzer and transmission electron microscopy. The maximum removal capacities of CFA for disperse blue and disperse orange dyes were 71 % (concentration 10−4 M; temp. 45 °C; dosage 4 g/50 mL; pH 6) and 75 % (concentration 10−4 M; temp. 45 °C; dosage 3 g/50 mL; pH 6), respectively. The experiments concluded that CFA was commercially beneficial for adsorption of disperse blue and disperse orange dyes and removes disperse orange dye with greater efficiency. The Langmuir isotherm better fit the adsorption data of both dyes, indicating monolayer adsorption of dyes on the CFA surface. The results of kinetics study revealed that disperse blue and disperse orange dyes follow pseudo-second-order kinetics. The CFA can be used as a potential adsorbent for removal of dyes from aqueous medium.
KeywordsCoal fly ash Disperse dyes Adsorption Isotherm Kinetics
The authors are grateful to Dr. K. C. Gupta, Director, IITR, Lucknow, for providing necessary facilities and fund for this work. Special thanks are due to Mr. B. D. Bhattacharji and Dr. D. S. Bhargava, Ex-Professor, IIT, Roorkee, Uttrakhand, for their valuable suggestions regarding this paper. The authors also thank Dr. L. K. S. Chauhan and Dr. P. N. Saxena for SEM–EDX and TEM photomicrographs.
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