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Adsorption of Lead(II) and Cadmium(II) Ions from Aqueous Solutions by Adsorption on Activated Carbon Prepared from Cashew Nut Shells

Authors: S. Tangjuank, N. Insuk , J. Tontrakoon , V. Udeye


Cashew nut shells were converted into activated carbon powders using KOH activation plus CO2 gasification at 1027 K. The increase both of impregnation ratio and activation time, there was swiftly the development of mesoporous structure with increasing of mesopore volume ratio from 20-28% and 27-45% for activated carbon with ratio of KOH per char equal to 1 and 4, respectively. Activated carbon derived from KOH/char ratio equal to 1 and CO2 gasification time from 20 to 150 minutes were exhibited the BET surface area increasing from 222 to 627 m2.g-1. And those were derived from KOH/char ratio of 4 with activation time from 20 to 150 minutes exhibited high BET surface area from 682 to 1026 m2.g-1. The adsorption of Lead(II) and Cadmium(II) ion was investigated. This adsorbent exhibited excellent adsorption for Lead(II) and Cadmium(II) ion. Maximum adsorption presented at 99.61% at pH 6.5 and 98.87% at optimum conditions. The experimental data was calculated from Freundlich isotherm and Langmuir isotherm model. The maximum capacity of Pb2+ and Cd2+ ions was found to be 28.90 m2.g-1 and 14.29 m2.g-1, respectively.

Keywords: Activated carbon, cashew nut shell, heavy metals, adsorption.

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[1] K. Kadirvelu, J. Goe, l. Rajagopal, Sorption of lead, mercury and cadmium ions in multi- component system using carbon aerogel as adsorbent, J. Hazard. Mater., vol. 153 pp. 502-507, 2008.
[2] K.Zhang, W.H. Cheung, M. Valix, Roles of physical and chemical properties of activated carbon in the adsorption of lead ions, Chemosphere., vol. 60, pp. 1129-1140, 2005.
[3] S. Cay, A. Uyanik, A. Ozasik, Single and binary component adsorption of copper(II) and cadmium(II) from aqueous solutions using tea-industry waste, Sep. Purif. Technol., vol. 38, pp. 273-280, 2004.
[4] G.P. Park, W.K. Tae, Y.C. Myeoung, K.Y. Ik, Activated carboncontaining alginate adsorbent for the simultaneous removal of heavy metals and toxic organics, Process, Biochem., vol. 42 (2007) 1371-1377.
[5] A.K. Gupta, K. Ganeshan, , K. Sekhar, Adsorptive removal of water poisons from contaminated water by adsorbents, J. Haz. Mat. B., vol. 137, pp. 396-400, 2006.
[6] Dabrowski, Adsorption-from theory to practice, Adv. Coll. Interf. Sci., vol. 93, pp. 135-224, 2001.
[7] J.W. Kim, M.H. Sohn, D.S. Kim, S.M. Sohn, Y.S. Kwon, Production of granular activated carbon from waste walnut shell and its adsorption characteristics for Cu2+ ion, J. Haz. Mat., vol. 85, pp. 301-315.
[8] A. Kuniawan, G.Y. Chan, W. Lo, S. Babel, Comparisons of low-cost adsorbents for treating wastewaters laden with heavy metals, Sci. Total. Environ., vol. 366, pp. 409-429, 2006.
[9] D. Yang, U. X, Studies of the activated carbons used in double-layer supercapacitors, J. Power. Source., vol. 109, pp. 403¶Çâ¡411, 2002.
[10] H.Z. Guo, H. Srinivasan, M.P. Yaming, A simple method for developing mesoporosity in activated carbon. Sep. Purif. Technol., vol. 31, pp. 47- 52, 2003.
[11] R.L.Tseng, S.K. Tseng, F.C. Wu, Preparation of high surface area carbons from corncob with KOH etching plus CO2 gasification for the adsorption of dyes and phenols from water, Coll. Surface A., vol. 279, pp. 69-78, 2006.
[12] Y. Guo, K. Yu, Z. Wang, H. Xu, Effects of activation conditions on preparation of porous carbon from rice husk, Carbon., vol.41, pp. 1645- 1648, 2003.
[13] M. Valix, W.H. Cheung, G. McKay, Preparation of activated carbon using low temperature carbonisation and physical activation of high ash raw bagasse for acid dye adsorption, Chemosphere., vol.56, pp. 493-501, 2004.
[14] N. Kannan, A. Rajakumar, Kannan, N., Rajakumar, A., 2003. Suitability of various indigenously prepared activated carbons for the adsorption of mercury(II) ions. Toxicol. Envi. Chem., vol.84, pp. 7-19, 2003.
[15] V. Srihari, B.S. Madhan, A. Das, Kinetics of phenol-sorption by raw agro-wastes, J. Appli. Sci., vol. 6, pp. 47-50, 2005.
[16] R. Sivabalan, S. Rengaraj, B. Arabindoo, V. Murugesan, Cashew nut sheath carbon : A new sorbent for defluoridation of water, Ind. J. Chem. Technol., vol. 10, pp. 217-222, 2003.
[17] M.Immamuglu, O. Tekir, Removal of copper (II) and lead (II) ions from aqueous solutions by adsorption on activated carbon from a new precursor hazelnut husks, Desalination., vol. 228, pp. 108-113, 2008.
[18] C.S. Liang, Z. Dang, B.H. Mao, W.L. Huang, C.Q. Liu, Equilibrium sorption of phenanthrene by soil humic acids, Chemosphere., vol. 63, pp.1961-1968, 2006.
[19] M.H. Kalavathy, T. Karthikeyan, S. Rajgopal, L.R. Marinda, Kinetic and isotherm studies of Cu(II) adsorption onto H3PO4-activated rubber wood sawdust, J. Coll. Interface Sci. vol. 292, pp. 354-362, 2005.
[20] M.M. Rao, A. Ramesh, G.P.C. Rao, K. Seshaiah, Removal of copper and cadmium from the aqueous solutions by activated carbon derived from Ceiba pentandra hulls, J. Haz. Mat., vol. 129, pp. 123-129, 2006.
[21] M. Machida, R. Yamazaki, M. Aikawa, H. Tatsumoto, Role of minerals in carbonaceous adsorbents for removal of Pb(II) ions from aqueous solution, Sep. Purif. Technol., vol. 46, pp. 88-94, 2005.
[22] S.K. Srivastava, R. Tyagi, N. Pant,. Adsorption of heavy metal ions on carbonaceous material developed from the waste slurry generated in local fertilizer plants, Water Res., vol. 23, pp. 1161-1165, 1989.
[23] C.J. Moon, J.H. Lee, Use of curdlan and activated carbon composed adsorbents for heavy metal removal, Process. Biochem., vol. 40, pp. 1279-1283, 2005.
[24] S. Ricordel, S. Taha, I. Cisse, G. Dorange, Heavy metals removal by adsorption onto peanut husks carbon : characterization, kinetic study and modeling, Sep. Sci. Technol., vol. 24, pp. 389-401, 2001.
[25] V.S.Gomez, J.V. Pastor, J.F. Perez, C.V. Duran, C.C. Valenzuela, FT-IR study of rockrose and of char and activated carbon, J. Anal. Appl. Pyro., vol. 36, pp. 71-80, 1996.
[26] T. Nabarawy, N.S. Petro, S. Abdel-Aziz, Adsorption characteristics of coal-based activated carbons. II. Adsorption of Water Vapor, Pyridine and Benzene, Adsorp. Sci. Technol., vol. 15, pp. 47-57, 1997.
[27] J.L. Figueiredo, M.F.R. Ereira, M.M.A. Freitas, J.J.M. Orfao, Modification of the surface chemistry of activated carbons, Carbon. vol. 37, pp. 1379-1389, 1999.
[28] M.M.J. Davila, M.P.G. Elizalde, A.A.C. Pelaez, Adsorption interaction between natural adsorbents and textile dyes in aqueous solution , Coll. Surface A., vol. 254, pp. 107-114, 2005.
[29] H.P. Boehm, Some aspects of the surface chemistry of carbon blacks and other carbons, Carbon., vol. 32, pp. 759-769, 1994.
[30] R. Arriagada,R. Garcia, M.S. Molina, F.R. Rodriguez, Effect of steam activation on the porosity and chemical nature of activated carbons from eucalyptus globulus and peach stone, Micro. Meso. Mat., vol. 8, pp. 123-130, 1997
[31] T. Yang, A.C. Lua, Mat. Textural and chemical properties of zinc chloride activated carbons prepared from pistachio-nut shells, Chem. Phys., vol. 100, pp. 438-444, 2006.
[32] Z. Hu, M.P. Srinivasan, Mesoporous high-surface-area activated carbon, Micro. Meso. Mat., vol. 43, pp. 267-275, 2001.
[33] Z. Hu, M.P. Srinivasan, Preparation of high-surface-area activated carbons from coconut shell, Micro. Meso. Mat., vol. 27, pp. 11-18, 1999.
[34] B.V. Babu, S. Gupta, Adsorption of Cr(VI) using activated neem leaves: kinetic studies, Adsorption., vol. 14, pp. 85-92, 2008.
[35] M, Sekar, V. Sakthi, S. Rengaraj, Kinetics and equilibrium adsorption study of lead(II) onto activated carbon prepared from coconut shell, J. Coll .Interf. Sci., vol. 279, pp. 307-313, 2004