Thermal detoxification and bloating of chromium(VI) with bentonite

Y. L. Wei, H. F. Hsieh, Y. S. Peng, J. C. Yang, H. Paul Wang, C. Y. Lin, W. L. Shih, C. C. Hsu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This study stabilizes and bloats Cr(VI)-sorbed bentonite by heating at high temperature. Cr leaching decreases with increasing temperatures. Heating the sample at 1100 °C results in a non-detectable Cr concentration in the leachate, equivalent to a Cr leaching percent less than 0.001% (i.e., Cr TCLP concentration < 0.018 mg of Cr L-1 of leachate). Morphology observed with a scanning electron microscopy indicates the occurrence of sintering of the sample heated at 1100 1°C. The heated samples also show the occurrence of a vesicant process at 1100 1°C. X-ray absorption spectroscopy results indicate that heating at 500 °C for 4h can convert approximately 87% Cr(VI) into Cr(III) that is negligibly toxic; Cr2O3 was detected to be the most abundant Cr species. After heating at higher temperatures, namely 900-1100 °C, almost all doped Cr(VI) is reduced to Cr(III) as inferred from the height of the pre-edge peak of XANES spectra and/or from XANES simulation.

Original languageEnglish
Pages (from-to)108-111
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
Publication statusPublished - 2010 Jul 1

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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