Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-20T02:22:25.140Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects of γ radiation on chromate immobilization by calcined hydrotalcites

Published online by Cambridge University Press:  01 January 2024

Sonia Martinez-Gallegos  and
Silvia Bulbulian
Sonia Martinez-Gallegos
Affiliation:
Instituto Nacional de Investigaciones Nucleares, A.P.18-1027, Col. Escandón, Delegatión Miguel Hidalgo, C.P. 11801, México D.F. Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario no. 100 Col. Centro, Toluca, Edo. de México, C.P. 50000
Silvia Bulbulian*
Affiliation:
Instituto Nacional de Investigaciones Nucleares, A.P.18-1027, Col. Escandón, Delegatión Miguel Hidalgo, C.P. 11801, México D.F.
*
*E-mail address of corresponding author: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The ability of hydrotalcites to retain anionic wastes was studied. In particular, Cr(VI)-adsorbed hydrotalcites were heated to immobilize Cr(VI) in the solid sample. When the heating temperature increased up to 500°C, the lamellar structure of hydrotalcite was lost. At high temperatures (1200°C), the solids were recrystallized in the form of a spinel. Lixiviation with 1 N and 5 N NaCl solutions were utilized to simulate the effect of sea water and of concentrated NaCl solutions in salt mines on the immobilization of Cr. Radiation damage on the solid containing the immobilized Cr was studied by γ-irradiating with a 60Co source at 1000 and 6000 kGy. The Cr-containing samples heated at 1200°C, whether irradiated or not, safely immobilized Cr in the hydrotalcite mainly in the form of MgCr2O4 spinel. Irradiation of hydrotalcites revealed two different effects: (1) samples heated up to 1200°C evolved as a solid in which chromium was retained more firmly than in the non-irradiated material, irradiation enhancing the spinel formation; (2) the structure of samples heated at 1200°C developed a preferential crystallite orientation rather than a purely random one or new location of chromium ions, this effect did not affect Cr immobilization in the solid. Chromium lixiviation with 5 N NaCl solution was always less than the corresponding value with 1 N NaCl solution, probably due to the poor mobility of Cl− ions in the highly concentrated NaCl solution.

Keywords

Chromium ImmobilizationGamma Irradiation EffectsHydrotalciteMg-Cr Spinel
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 5 , October 2004 , pp. 650 - 656
Copyright
Copyright © 2004, The Clay Minerals Society

References

Bosch, P. García, I. Solache, M. and Bulbulian, S., (1995) Co2+ ion exchange in zeolite NaA Separation Science and Technology 30 3399–3403 10.1080/01496399508013154.Google Scholar
Bulbulian, S. and Bosch, P., (2000) Vitrification of gamma irradiated 60Co2+ zeolites Journal of Nuclear Materials 295 64–72 10.1016/S0022-3115(01)00489-5.Google Scholar
Chatelet, L. Bottero, J.Y. Yvon, J. and Bouchelaghen, A., (1996) Competition between monovalent and divalent anions for calcined and uncalcined hydrotalcites: anion exchange and adsorption sites Colloid Surface A111 167–175 10.1016/0927-7757(96)03542-X.Google Scholar
Földeslová, M. Lukác, P. Majling, J. and Tomoková, V., (1996) Deposition of cesium and cobalt sorbed on zeolite in matrices of blast furnace slag Journal of Radioanalytical and Nuclear Chemistry Letters 212 293–302 10.1007/BF02162522.Google Scholar
Goswamee, R.L. Sengupta, P. Bhattacharyya, K.G. and Dutta, D.K., (1998) Adsorption of Cr (VI) in layered double hydroxides Applied Clay Science 13 21–34 10.1016/S0169-1317(98)00010-6.Google Scholar
Hibino, T. and Tsunashima, A., (1998) Characterization of repeatedly reconstructed Mg-Al hydrotalcite-like compounds: gradual segregation of aluminum from the structure Chemical Materials 10 4055–4061 10.1021/cm980478q.Google Scholar
Hibino, T., Uchisawa, J. and Tsunashima, A. (1999) Synthesis and applications of hydrotalcite-type anionic clays. Report of the National Institute for Resources and Environment, Tsukuba, Japan, pp. 1–20.Google Scholar
Klug, H.P. and Alexander, L.E., Wiley-Interscience, Investigation of Preferred Orientation and Texture X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials (1974) New York John Wiley & Sons 709–754.Google Scholar
Labajos, F.M. and Rives, V., (1996) Thermal evolution of chromium (III) ions in hydrotalcite-like compounds Inorganic Chemistry 35 5313–5318 10.1021/ic951648t.Google Scholar
Miyata, S., (1980) Physico-chemical properties of synthetic hydrotalcites in relation to composition Clays and Clay Minerals 28 50–56 10.1346/CCMN.1980.0280107.Google Scholar
Nakamoto, K., Wiley-Interscience, Inorganic compounds Infrared and Raman Spectra Inorganic and Coordination Compounds (1978) New York John Wiley & Sons 101–165.Google Scholar
O’Dwyer, T.F. and Hodnett, B.K., (1995) Recovery of chromium from tannery effluents using a redox-adsorption approach Journal of Chemical and Technology Biotechnology 62 30–37 10.1002/jctb.280620105.Google Scholar
Rao, C.N. and Gopalakrishnan, J., (1997) New Directions in Solid State Chemistry Cambridge, UK Cambridge University Press 30–32 10.1017/CBO9780511623141.Google Scholar
Ross, D.S. and Sykes, P., (1972) Spinels Inorganic Infrared and Raman Spectroscopy New York McGraw Hill, London 112–117.Google Scholar
Sato, T. Fujita, H. Endo, T. Shimada, M. and Tsunashima, A., (1988) Synthesis of hydrotalcite-like compounds and their physico-chemical properties Reactivity of Solids 5 219–228 10.1016/0168-7336(88)80089-5.Google Scholar
Thamzil, L., (1997) Waste treatment immobilization technologies involving inorganic sorbents Vienna, Austria International Atomic Energy Agency.Google Scholar
Ulibarri, M.A. Pavlovic, I. Barriga, C. Hermosín, M.C. and Cornejo, J., (2001) Adsorption of anionic species on hydrotalcite-like compounds: effect of interlayer anion and crystallinity Applied Clay Science 18 17–27 10.1016/S0169-1317(00)00026-0.Google Scholar
Yui, M. Rai, D. Ochs, M. and Shibata, M., (2003) Applicability of thermodynamic database of radioactive elements developed for the Japanese performance assessment of HLW repository Journal of Nuclear Science and Technology 40 356–362 10.1080/18811248.2003.9715366.Google Scholar