Adsorption behaviour of 226Ra and 210Pb onto thermally treated forms of bentonite

Abstract

This study investigated the sorption selectivity of bentonite and its thermally treated forms, at 150, 300 and 600 °C, for 226Ra and 210Pb. Characterisation of adsorbents was performed by applying Fourier transform infrared spectroscopy and a scanning electron microscope. Adsorption data showed the materials illustrated comparable behaviour for 210Pb, but varied when chemical containments existed in solution. Bentonite heated at 600 °C (B-600) was the best adsorbent for 226Ra. Influence of macro contaminants revealed K+ was the greatest inhibitor for 226Ra and Ca2+ for 210Pb. The data conclude B-600 would be the preferable mineral for constructing engineered disposal facilities.

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Acknowledgements

The authors would like to express their sincere appreciation to Prof. I. Othman (General Director of AECS) for his encouragement and funding the project; Dr. S. Al Masri (Head of the Department) is also thanked. Acknowledgment should be paid to Dr. M. Kh. Sabra (Head of the Physics Department), Mr. N. Kafri for SEM analysis, Dr. A.W. Allaf (Head of Chemistry Department) for FTIR analysis, Mr. M. Hassan for gamma measurements, Dr. M. Tlas and Mr. Z. Sheib for their assistance with statistical analysis of data.

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Correspondence to Lina Al Attar.

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Al Attar, L., Safia, B. & Abdul Ghani, B. Adsorption behaviour of 226Ra and 210Pb onto thermally treated forms of bentonite. J Radioanal Nucl Chem 327, 1167–1178 (2021). https://doi.org/10.1007/s10967-021-07606-1

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Keywords

  • Bentonite
  • Thermal treatment
  • FTIR
  • SEM
  • 226Ra
  • 210Pb