The use of activated charcoal as treatment material for the removal of Cr (VI) from aqueous solution was investigated. Maximum adsorption of Cr (VI) was achieved under acidic pH (pH=4) after a contact time of approximately 120 minutes. The activated charcoal was treated in order to vary the pH from acid to base so that its influence on the removal of the metal ions could be investigated. In order to study possible structural changes of the treatment material (activated charcoal), scanning electron microscopy (SEM) and UV-VIS molecular adsorption spectrometer, before and after adsorption of Cr (VI) was investigated in detail to validate the adsorption of the heavy metal. Detailed investigation included the effects of initial concentration, adsorbent dose, contact time, pH of solution for the adsorption process and the evaluation of optimum conditions required for a high yield of Cr (VI) removal. The Langmuir adsorption isotherm model was applied to analyse the adsorption data. The results show that activated charcoal was found effective for the removal of Cr (VI) from aqueous solutions. The purpose of the study was to determine the capabilities for Cr (VI) removal of the activated charcoal and the influence that pH values have over the treatment efficiency in order to obtain the best conditions necessary for water treatment.
activated charcoal, Cr (VI), adsorption, SEM, UV-VIS, water treatment
 V. Gupta and A. Rastogi, "Biosorption of hexavalent chromium by raw and acid-treated green alga Oedogonium hatei from aqueous solutions," Journal of Hazardous Materials, vol. 163, 2009, pp. 396-402.
 K. Mohanty, M. Jha, B. Meikap, and M. Biswas, "Removal of chromium (VI) from dilute aqueous solutions by activated carbon developed from Terminalia arjuna nuts activated with zinc chloride," Chemical Engineering Science, vol. 60, 2005, pp. 3049-3059.
 M. Pang, B. Liu, N. Kano, and H. Imaizumi, "Adsorption of chromium (VI) onto activated carbon modified with KMnO 4," Journal of Chemistry and Chemical Engineering, vol. 9, 2015, pp. 280-287.
 L. E. Korshoj, A. J. Zaitouna, and R. Y. Lai, "Methylene blue-mediated electrocatalytic detection of hexavalent chromium," Analytical chemistry, vol. 87, 2015, pp. 2560-2564.
 Z. A. Al-Othman, R. Ali, and M. Naushad, "Hexavalent chromium removal from aqueous medium by activated carbon prepared from peanut shell: adsorption kinetics, equilibrium and thermodynamic studies," Chemical Engineering Journal, vol. 184, 2012, pp. 238-247.
 G. Tiravanti, D. Petruzzelli, and R. Passino, "Pretreatment of tannery wastewaters by an ion exchange process for Cr (III) removal and recovery," Water Science and Technology, vol. 36, 1997, pp. 197-207.
 Z. Song, C. Williams, and R. Edyvean, "Sedimentation of tannery wastewater," Water Research, vol. 34, 2000, pp. 2171-2176.
 H. Oda and Y. Nakagawa, "Removal of ionic substances from dilute solution using activated carbon electrodes," Carbon, vol. 41, 2003, pp. 1037-1047.
 A. G. Vlyssides and C. J. Israilides, "Detoxification of tannery waste liquors with an electrolysis system," Environmental Pollution, vol. 97, 1997, pp. 147-152.
 Z. Song, C. Williams, and R. Edyvean, "Treatment of tannery wastewater by chemical coagulation," Desalination, vol. 164, 2004, pp. 249-259.
 C. Fabiani, F. Ruscio, M. Spadoni, and M. Pizzichini, "Chromium (III) salts recovery process from tannery wastewaters," Desalination, vol. 108, 1997, pp. 183-191.
 A. Hafez, M. El-Manharawy, and M. Khedr, "RO membrane removal of unreacted chromium from spent tanning effluent. A pilot-scale study, Part 2," Desalination, vol. 144, 2002, pp. 237-242.
 L. K. Wang, D. B. Dahm, R. E. Baier, and R. C. Ziegler, "Treatment of tannery effluents by surface adsorption," Journal of Chemical Technology and Biotechnology, vol. 25, 1975, pp. 475-490.
 C. S. Brooks, Metal recovery from industrial waste: CRC, 1991.
 G. Macchi, M. Pagano, M. Pettine, M. Santori, and G. Tiravanti, "A bench study on chromium recovery from tannery sludge," Water research, vol. 25, 1991, pp. 1019-1026.
 M. Gholipour, H. Hashemipour, and M. Mollashahi, "Hexavalent chromium removal from aqueous solution via adsorption on granular activated carbon: adsorption, desorption, modeling and simulation studies," J. Eng. Appl. Sci, vol. 6, 2011, pp. 10-18.
 U. K. Garg, M. Kaur, V. Garg, and D. Sud, "Removal of hexavalent chromium from aqueous solution by agricultural waste biomass," Journal of Hazardous Materials, vol. 140, 2007, pp. 60-68
Cite this paper
Claudia Dragan, Cristian Pantilimon, Andra Predescu, George Coman, Ecaterina Matei, Cristian Predescu. (2018) Removal of Cr (VI) from Aqueous Solution Using Activated Charcoal. International Journal of Chemistry and Chemical Engineering Systems, 3, 11-15
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