ABSTRACT The removing zinc cation from aqueous solution by Ca-bentonite and Na-exchanged bentonite was studied. The factors such as the initial concentration of Zn2+, the liquid-to-solid ratio, pH, adsorption time, stirring speed, coexisting ions, temperature and bentonite particle size were investigated. The results show that the adsorption process of bentonite accorded with the Freundlich isotherm model, the removal of Zn2+ by Ca-bentonite and Na-exchanged bentonite reached equilibrium in 2 h, and adsorption of Na- bentonite was superior to Ca-bentonite. The adsorption rate of zinc increased with increasing pH, temperature, stirring speed, time span and with decreasing bentonite particle, the initial concentration of Zn2+ and the liquid-to-solid ratio. In mixed solution which contains Pb2+and Cr6+, Pb2+ has no influ- ence on the removal of Zn2+ by both the bentonites while Cr6+can decease it.
Cite this paper
nullS. Ding, J. Shen, B. Xu, Q. Liu and Y. Sun, "The Factors on Removal of Zinc Cation from Aqueous Solution by Bentonite," Natural Resources, Vol. 2 No. 2, 2011, pp. 107-113. doi: 10.4236/nr.2011.22015.
 C. G. Fraga, “Essentiality and Toxicity of Trace Elements in Human Health,” Molecular Aspects of Medicine, 2005, Vol. 26, pp. 235-244.doi:10.1016/j.mam.2005.07.013
 Y. H. Liu, X. B. Wan, A. H. Li and Y. Y. Dong, “Bentonite Modified and Its Purification of Zn2+ in Water,” Chemistry and Bioengineering, 2007, Vol. 24, No. 3, pp. 34-35.
 Z. A. Wang, Y. M. Zhu, D. Z. Wei and S. J. Dai, “Research on Adsorption of Zn2+ from Wastewater by Ca-Bentonite,” Non-ferrous Mining and Metal-lurgy, Vol. 22, No. 2, 2006, pp. 45-47.
 J. F. Pan and J. Lu, “Experimental Study on Adsorbing the Pb2+、Ni2+、Cd2+ from Wastewater with Natural Ca-Bentonite and Modified Ca-Bentonite,” China Mining Magazine, Vol. 9, 2008, pp. 35-138.
 J. F. Hodgson, “Cobalt Reactions with Mont-morillonite,” Soil Science Society of America Proceedings, Vol. 24, 1960, pp. 165-168.
 P. Peigneur, A. Maes and A. Cremers, “Heterogeneity of Charge Density Distribution in Montmorillonite as Inferred from Cobalt Adsorption,” Clays and Clay minerals, Vol. 23, 1975, pp. 71-75.
 M. F. Brigatti, F. Corradini, et al., “Interaction between Montmorillonite and Pollutants from Industrial Waste- Water: Exchange of Zn2+ and Pb2+from Aqueous Solutions,” Applied Clay Science, Vol. 9, 1995, pp. 383-385. doi:10.1016/0169-1317(94)00027-N
 M. J. Garcia and A. L. Page, “Influence of Ionic Strength and in Organic Complex Formation on the Sorption of Trace Amounts of Cd by Montmorillonite,” Soil Science Society of America Proceedings, Vol. 40, 1976, pp. 658-663.
 H. Omar, H. Arida and A. Daifullan, “Adsorption of 60Co Ra-dionuclides from Aqueous Solution by Raw and Modified Bentonite,” Applied Clay Science, Vol. 44, 2009, pp 21-26. doi:10.1016/j.clay.2008.12.013
 S. T. Akar, T. Akar and Z. Kaynak, “Removal of Copper (ii) Ions from Synthetic Solution and Real Wastewater by the Combined Action of Dried Tram-etes Versicolor Cells and Montmorillonite,” Hydrometallurgy, Vol. 97, 2009, pp. 98-104. doi:10.1016/j.hydromet.2009.01.009
 E. Alvarez-Ayuso and A. Ganchez-Sanchez, “Removal of Heavy Metals from Waste Waters by Natural and Na-exchanged bentonite.” Clays and Clay Minerals, Vol. 51, No. 5, 2003, pp. 475-480.
 W. Matthes, F. T. Madsen and G. Kahr, “Sorption of Heavy-Metal Cations by Al and Zr-hydroxy Intercalated and Pillared Bentonite,” Clays and Clay Minerals, Vol. 47, No. 5, 1999, pp. 617-629.
 G. Bayramoglu and M. Y. Arica, “Construction a Hybrid Biosorbent Using Scenedes-mus Quadricauda and Ca-Alginate for Biosorption of Cu (II), Zn (II) and Ni (II): Kinetics and Equilibrium Studies,” Biore-source Technology, Vol. 100, 2009, pp. 186-193.
 E. Eren, “Removal of Copper Ions by Modified Unye clay, Turkey,” Journal of Haz-ardous Materials, Vol. 159, 2008, pp. 235-244. doi:10.1016/j.jhazmat.2008.02.035
 Ministry of Environ-mental Protection of the People’s Republic of China, Commit-tee on Water and Wastewater Monitoring Methods, “Monitor-ing Analysis Method of Water and Wastewater,” Environ-mental Science Press of China, Beijing, 2002.
 N. ünlü and M. Ersoz, “Removal of Heavy Metal Ions by Using Di-thiocarbamated-Sporopollenin,” Separation and Purification Technology, Vol. 52, 2007, pp. 461-469. doi:10.1016/j.seppur.2006.05.026
 D. Hunkeler and L. R. Ehwald, “Cell Physiology and Interactions of Biomaterials and Matrices,” Proceedings of the X International BRG Workshop on Bioencapsulation, 2002, pp. 183-186.
 M. Alkan, B. Kalay, M. Do?an and ?. Demirba?, “Removal of Copper Ions from Aqueous Solutions by Kaolinite and Batch Design,” Journal of Hazardous Materials, Vol. 153, 2008, pp. 867-876.
 S. L. Ding and C. G. Sun, “Study on Factors Affecting Adsorption of Cr6+ in Wastewater by Bentonite,” Non-metallic Mines, Vol. 29, No. 3, 2006, pp. 45-48.
 E. I. Unuabonah, B. I. Olu-Owolabi, K. O. Adebowale, et al. “Adsorption of Lead and Cadmium Ions from Aqueous Solutions by Tripolyphosphate-Impregnated Kaolinite Clay,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007, Vol. 292, pp. 202-211. doi:10.1016/j.colsurfa.2006.06.024
 H. P. He, “Study on the Effect of Metal Ions and Clay Mineral,” Petroleum Industry Press, Beijing, 2001.
 P. X. Wu, “Clay Mineral Materials and Environmental Remediation,” Chemical Industry Press, Beijing, 2004.
 S. L. Ding, Y. Z. Sun, C. N. Yang and B. h. Xu, “Removal of Copper from Aqueous Solutions by Ben-tonites and the Factors Affecting it,” Mining Science and Tech-nology, 2009, Vol. 19, No. 4, pp. 489-492. doi:10.1016/S1674-5264(09)60091-0