Structural, Textural and Thermal Characterization of Nano-Mg/Al Hydrotalcite before and after Cr (VI) Removal

Abstract:

In this work there was studied the structural, textural and effect that has treat thermal on the removal of Cr (VI) of nanoMg/Al hydrotalcite (NHT) synthesized by the sol-gel method with a ratio of Mg/Al=3. These present the characterization of the nanoMg/Al hydrotalcite before and after Cr (VI) removal, as well as the kinetic studies and of balance. In agreement with the results, when the NHT are thermal treated to 350 °C the hydrotalcite crystalline structure remains but the textural properties are improved and structural. The NHT synthesized by the sol-gel method present a good capacity of removal with values of 91 mg of Cr (VI) removed / g of NHT. The above mentioned capacity of removal gets improved after thermal treating the material, reaching values of removal of 124 mg of Cr (VI) removed / g of NHT. The NHT with the Cr (VI) absorbed show decrease of the crystalline structure, as well as a saturation of the pores that annuls the porosity due to the fact that the Cr (VI) lodges both at the pores and at the intersheets. The time that him takes the HLM to remove the Cr (VI) of the watery solution is alone of 2 minutes, with which it is possible to conclude that the NHT have an excellent aptitude to remove Cr (VI) of watery solutions in an interval of very short time.

• Periodical: Materials Science Forum (Volume 755)
• Pages: 53-60
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.755.53
• Online since: April 2013
• Authors: Esthela Ramos Ramírez, Norma Leticia Gutiérrez Ortega, Cesar Augusto Contreras Soto, Gustavo Rangel Porras
• Keywords: Adsorption, Chromium (VI), Isotherm, Nano Hydrotalcite, Sol-Gel

References

[1] F. Trifiro, A. Vaccari, Hydrotalcite-like anionic clays double hydroxides), in: J.L. Atwood, J.E.D. Davies, MacNicol, F. Vgtle (Eds. ), Comprehensive Supramolecular Chemistry, vol. 7, Pergamon, Oxford, 1996, p.251.

[2] T. Cavani, E. Trifiro and E.A. Vaccari, Hydrotalcite-type anionic clays: Preparation, properties and applications, Catalysis Today 2 (1991) 173-301.

DOI: 10.1016/0920-5861(91)80068-k

[3] H. F.W. Taylor, Crystal Structures of Some Double Hydroxide Minerals, Miner. Mag. 39 (1973) 377-389.

DOI: 10.1180/minmag.1973.039.304.01

[4] J.S. Raisman and A.M. González: Impacto de los residuos de las tenerías sobre el medio ambiente y la salud humana (Hipertextos del Área de la Biología 2004).

DOI: 10.25062/9786280000701.04

[5] J.S. Raisman and A.M. González: Curtido Al Cromo (Hipertextos del Área de la Biología 2004).

[6] IARC: Monograph on the Evaluation of Carcinogenic Risk to Humans, Chromium, Nickel and Welding, Lyon, France (1990).

[7] R.A. Anderson, Nutritional role of chromium, Sci. Total Environ 17 (1981) 13-29.

[8] L. Fishbein, Sources, transport and alterations of metal compounds: an overview. I. Arsenic, beryllium, cadmium, chromium and nickel, Environ. Health Perspect 40 (1981) 43-64.

DOI: 10.1289/ehp.814043

[9] P.H.S. US Department of Health and Human Services: Toxicological Profile for Chromium, (2000).

[10] G.X. Pan, Z.M. Ni, C.P. Fang, L.G. Wang and J.B. Chen, ZnA1 hidrotalcita adsorción estudio de rendimiento de Cr (VI), Journal of Zhejiang University of Technology 33 (2005) 334-336.

[11] S.S. Baral, S.N. Das, P. Rath, G.R. Chaudhury and R. Gautam, Chromium(VI) removal by calcined bauxite, J. Bio. Chem. Eng. 34 (2007) 69-75.

DOI: 10.1016/j.bej.2006.11.019

[12] Q.L. Wan, Q.S. Wang, Q.Z. Huang, S.M. Wang, Treatment of chromium(VI) in water by bentonite-chitosan compound adsorbent, Industrial Water and Wastewater 37 (2006) 44-47.

[13] J.Y. Park, W.H. Kang and I. Hwang, Hexavalent chromium uptake and release in cement pastes, Env. Eng. Sci. 23 (2006) 133-140.

DOI: 10.1089/ees.2006.23.133

[14] E. Alvarez-Ayuso, A. García-Sánchez and X. Querol, Adsorption of Cr(VI) from synthetic solutions and electroplating wastewaters on amorphous aluminium oxide, J. Hazard. Mater. 142 (2007) 191-198.

DOI: 10.1016/j.jhazmat.2006.08.004

[15] Y.C. Sharma and C.H. Weng, Removal of chromium(VI) from water and wastewater by using riverbed sand: Kinetic and equilibrium studies, J. Hazard. Mat. 142 (2007) 449-454.

DOI: 10.1016/j.jhazmat.2007.04.014

[16] S.J. Xia, Z.M. Ni, G.X. Pan and L. G. Wang, Study of adsorption of Cr(VI) from aqueous solutions on Co/Mg/Al-layered double hydroxides, Journal of Zhejiang University of Technology 34 (2006) 517-520.

[17] K. Nakamoto: Infrared and Raman Spectra of Inorganic and Coordination Compounds, (A Wiley – Interscience Publication 1986).

[18] M. J. Hernandez-Moreno, M. A. Ulibarri, J.L. Rendon, and C. J. Serna, IR characteristics of hydrotalcite-like compounds, Phys. Chem. Minerals 12 (1985) 34-38.

[19] M. Bolognini, F. Cavani, D. Scagliarini, C. Flego, C. Perego and M. Saba, Mg/Al mixed oxides prepared by coprecipitation and sol–gel routes: a comparison of their physico-chemical features and performances in m-cresol methylation, Micro. Meso. Mater. 66 (2003).

DOI: 10.1016/j.micromeso.2003.09.010

[20] T. W. Weber and R. K. Chakraborty, Pore and solid diffussion models for fixed bed adsorbents, J. Am. Inst. Chem. Eng. 20 (1974) 2228-2238.

[21] N. Ahalya, R.D. Kanamadi and T.V. Ramachandra, Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram (Cicer arientinum), Electron. J. Biotechnol. 8 (2005) 258-264.

DOI: 10.2225/vol8-issue3-fulltext-10