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

doi:10.1016/j.nima.2009.10.130

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

Department of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	108-111
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	619
Issue number	1-3
DOIs	https://doi.org/10.1016/j.nima.2009.10.130
Publication status	Published - 2010 Jul 1

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Instrumentation

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10.1016/j.nima.2009.10.130

Cite this

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title = "Thermal detoxification and bloating of chromium(VI) with bentonite",

abstract = "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.",

author = "Wei, \{Y. L.\} and Hsieh, \{H. F.\} and Peng, \{Y. S.\} and Yang, \{J. C.\} and Wang, \{H. Paul\} and Lin, \{C. Y.\} and Shih, \{W. L.\} and Hsu, \{C. C.\}",

note = "Funding Information: The authors thank Professor J.-F. Lee and the staff at the NSRRC of Taiwan for their assistance during the XAS experimentation. This project was sponsored by the National Science Council of Taiwan ( NSC 89-2211-E-029-008 ). ",

year = "2010",

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doi = "10.1016/j.nima.2009.10.130",

language = "English",

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journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

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T1 - Thermal detoxification and bloating of chromium(VI) with bentonite

AU - Wei, Y. L.

AU - Hsieh, H. F.

AU - Peng, Y. S.

AU - Yang, J. C.

AU - Wang, H. Paul

AU - Lin, C. Y.

AU - Shih, W. L.

AU - Hsu, C. C.

N1 - Funding Information: The authors thank Professor J.-F. Lee and the staff at the NSRRC of Taiwan for their assistance during the XAS experimentation. This project was sponsored by the National Science Council of Taiwan ( NSC 89-2211-E-029-008 ).

PY - 2010/7/1

Y1 - 2010/7/1

N2 - 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.

AB - 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.

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DO - 10.1016/j.nima.2009.10.130

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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IS - 1-3

ER -

Thermal detoxification and bloating of chromium(VI) with bentonite

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