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Isotherm, Kinetic and Thermodynamic Studies for the Sorption of Mercury (II) onto Activated Carbon from Rosmarinus officinalis Leaves

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ABSTRACT
The present work deals with the equilibrium adsorption of Hg(II) onto carbonized Rosmarinus officinalis leaves (ACROL) as a new adsorbent from aqueous solution and it has been investigated. ACROL samples were prepared by physical carbonization at 773 K for 1 h. Titration method was used to determine the concentration of Hg(II) before and after adsorption onto ACROL by ethylenediaminetetraacetic acid, EDTA, as chelating agent. Batch equilibrium studies were carried out under different experimental conditions such as Hg(II) concentration and temperature. The relationship between the amount of Hg(II) onto ACROL can be described using four tow-parameter isotherm models. The equilibrium sorption data were analyzed using Freundlich, Langmuir, Dubinin-Radushkevich (DRK) and Temkin isotherms. The experimental results were found to fit the Langmuir isotherm model with a monolayer adsorption capacity of 588.2 mg/g at 318 K, while they were found to fit the Freundlich isotherm model at 298 K. The KL was decreased with increasing temperature, indicating a bond strength between Hg(II) and ACROL decreased with increasing temperature and sorption is exothermic. From DRK isotherm, free energy, E, was higher than 31 kJ/mol suggesting the Hg(II) adsorption onto ACROL chemical sorption. The thermodynamic studies revealed that the process is spontaneous nature of Hg(II) adsorption by ACROL and exothermic. The findings from this research show that ACROL has capability to remove Hg(II) from aqueous solutions.
 
Cite this paper
Erhayem, M. , Al-Tohami, F. , Mohamed, R. and Ahmida, K. (2015) Isotherm, Kinetic and Thermodynamic Studies for the Sorption of Mercury (II) onto Activated Carbon from Rosmarinus officinalis Leaves. American Journal of Analytical Chemistry, 6, 1-10. doi: 10.4236/ajac.2015.61001.
 
References
[1]Lu, X.C., Jiang, J.C., Sun, K., Wang, J.B. and Zhang, Y.P. (2014) Influence of the Pore Structure and Surface Chemical Properties of Activated Carbon on the Adsorption of Mercury from Aqueous Solutions. Marine Pollution Bulletin, 78, 69-76.
http://dx.doi.org/10.1016/j.marpolbul.2013.11.007
 
[2]Luo, J.J., Hein, A.M. and Hwang, J.Y. (2004) Adsorption of Vapor Phase Mercury on Various Carbons. Journal of Minerals & Materials Characterization & Engineering, 3, 13-22.
 
[3]Wilcox, J., Rupp, E., Ying, S.C., Lim, D.-H., Negreira, A.S., Kirchofer, A., Feng, F. and Lee, K. (2012) Mercury Adsorption and Oxidation in Coal Combustion and Gasification Processes. International Journal of Coal Geology, 90-91, 4-20.
 
[4]Ariya, P.A., et al. (2004) The Arctic: A Sink for Mercury. Tellus B, 56, 397-403.
http://dx.doi.org/10.1111/j.1600-0889.2004.00118.x
 
[5]Malamisa, S. and Katsoua, E. (2013) A Review on Zinc and Nickel Adsorption on Natural and Modified Zeolite, Bentonite and Vermiculite: Examination of Process Parameters, Kinetics and Isotherms. Journal of Hazardous Materials, 252-253, 428-461.
 
[6]Clercq, J.D. (2012) Removal of Mercury from Aqueous Solutions by Adsorption on a New Ultra Stable Mesoporous Adsorbent and on a Commercial Ion Exchange Resin. International Journal of Industrial Chemistry, 1, 3.
 
[7]Erhayem, M. and Sohn, M. (2014) Stability Studies for Titanium Dioxide Nanoparticles upon Adsorption of Suwannee River Humic and Fulvic Acids and Natural Organic Matter. Science of the Total Environment, 468-469, 249-257.
http://dx.doi.org/10.1016/j.scitotenv.2013.08.038
 
[8]Evbuomwan, B.O., Agbede, A.M. and Atuka, M.M. (2013) A Comparative Study of the Physico-Chemical Properties of Activated Carbon from Oil Palm Waste (Kernel Shell and Fibre). International Journal of Science and Engineering Investigations, 2, 75-79.
 
[9]Madu, P.C. and Lajide, L. (2013) Physicochemical Characteristics of Activated Charcoal Derived from Melon Seed Husk. Journal of Chemical and Pharmaceutical Research, 5, 94-98.
 
[10]Verla, A.W., Horsfall Jr., M., Verla, E.N., Spiff, A.I. and Ekpete, O.A. (2012) Preparation and Characterization of Activated Carbon from Fluted Pumpkin (Telfairia Occidentalis Hook.F) Seed Shell. Asian Journal of Natural & Applied Science, 1, 39-50.
 
[11]Aziza, K.G., Haiko, H., Artur, S.J., Simone, M.S. (2008) Rosemary (Rosmarinus officinalis)—A Study of the Composition, Antioxidant and Antimicrobial Activities of Extracts Obtained with Supercritical Carbon Dioxide. Food Science and Technology (Campinas), 28, 463-469.
http://dx.doi.org/10.1590/S0101-20612008000200030
 
[12]Al-Tohami, F., Erhayem, M., Ali, R. and Ali, M. (2014) Optimization Parameters for Adsorption of Hg (II) Ions onto Carbonized Rosmarinus Officinalis Leaves (ACROL) from Aqueous Solutions. TCSSE International Conference of Science and Technology, Dubai, 26-27 August 2014. (As Poster)
 
[13]Ofomaja, A.E. (2010) Equilibrium Studies of Copper Ion Adsorption onto Palm Kernel Fibre. Journal of Environmental Management, 91, 1491-1499.
http://dx.doi.org/10.1016/j.jenvman.2010.02.029
 
[14]Memon, G.Z., Bhanger, M.I. and Akhtar, M. (2007) The Removal Efficiency of Chestnut Shells for Selected Pesticides from Aqueous Solutions. Journal of Colloid and Interface Science, 315, 33-40.
http://dx.doi.org/10.1016/j.jcis.2007.06.037
 
[15]Mohamed, A., Hesham, G.I. and Mohamed, M.A. (2008) Equilibrium and Kinetics of Chromium Adsorption on Cement Kiln Dust. Proceedings of the World Congress on Engineering and Computer Science, San Francisco, 22-24 October 2008, 54-62.
 
[16]Atar, N., Olgun, A. and Wangb, S. (2012) Adsorption of Cadmium (II) and Zinc (II) on Boron Enrichment Process Waste in Aqueous Solutions: Batch and Fixed-Bed System Studies. Chemical Engineering Journal, 192, 1-7.
http://dx.doi.org/10.1016/j.cej.2012.03.067
 
[17]Erhayem, M. and Sohn, M. (2014) Effect of Humic Acid Source on Humic Acid Adsorption onto Titanium Dioxide Nanoparticles. Science of the Total Environment, 470-471, 92-98.
http://dx.doi.org/10.1016/j.scitotenv.2013.09.063
 
[18]Varank, G., Demir, A., Yetilmezsoy, K., Top, S., Sekman, E. and Bilgili, M.S. (2012) Removal of 4-Nitrophenol from Aqueous Solution by Natural Low-Cost Adsorbents. Indian Journal of Chemical Technology, 19, 7-25.
 
[19]Bulgariu, L., Ratoi, M., Bulgariu, D. and Macoveanu, M. (2008) Equilirium Study of Pb (II) and Hg (II) Sorption from Aqueous Solutions by Moss Peat. Bulgariu, Laura, Mioara Ratoi, Dumitru Bulgariu, and Matei Macoveanu. EQUIL Environmental Engineering & Management Journal, 7, 511-516.                                        eww150113lx
 
[20]Nagy, B., Maica, A., Indolean, C. and Burca, S. (2013) Cadmium (II) Ions Removal from Aqueous Solutions Using Romanian Untreated fir Tree Sawdust a Green Biosorbent. Acta Chimica Slovenica, 60, 263-273.
 
[21]Shahmohammadi-Kalalagh, S., Babazadeh, H., Nazemi, A. and Manshouri, M. (2011) Isotherm and Kinetic Studies on Adsorption of Pb, Zn and Cu by Kaolinite. Caspian Journal of Environmental Sciences, 9, 243-255.
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