NDLI: Removal of Hexavalent Chromium from Aqueous Solutions by Sorption into a Novel Sawdust Anion Exchanger (SAE) Sorbent

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Removal of Hexavalent Chromium from Aqueous Solutions by Sorption into a Novel Sawdust Anion Exchanger (SAE) Sorbent

Content Provider	Semantic Scholar
Author	Bajpai, Sunil Kumar Rohit, V. K.
Copyright Year	2009
Abstract	This research focuses on removal of Cr(VI) from aqueous solutions using a potential sorbent. The parameters studied include agitation time, co-ion effect, initial chromium ion concentration, pH and temperature. Different kinetic models are studied for two particle sizes, 211 and 84 µm, and the rate is mainly controlled by intraparticle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data at three different temperatures. The adsorption capacity (Qo) obtained from the Langmuir isotherm plots were 16.83, 20.44, and 23.14 mg g -1 respectively at 20, 35, and 50 0 C. The temperature variation study showed that the chromium ion adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the chromium ion solutions. For the particles with diameter 211 and 84 µm, the values of kid were found to be 1.05 and 1.48 mg l -1 min -0.5 . The sorption mean free energy from the Dubinin-Radushkevich isotherm was found to be 10.54 kJ mol -1 , indicating the chemical nature of sorption. Various thermodynamic parameters have also been evaluated. Finally, the presence of Cu 2+ ions in the sorbate was found to decrease the uptake of Cr(VI).
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://aes.asia.edu.tw/Issues/JEPS2009/BajpaiSK2009.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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