Structure and thermal stability of toxic chromium(VI) species doped onto TiO2 powders through heat treatment

Su Hsia Lin, Chia Nan Chen, Ruey Shin Juang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

10 Scopus citations

Abstract

Chromium(VI)-containing sorbents in the form of sludge or solid residue from treatment processes are often landfilled or used as fill materials, therefore the long-term stability of metal binding is important. The reduction of Cr(VI)-Cr(III) through heat treatment may be a useful detoxification method. After heating at 500, 900, 1000, and 1100 °C for 4 h, the transformation of chemical states of chromium on 105 °C-dried, 7.9% Cr(VI)-doped TiO2 powders was studied on the basis of surface area measurements, scanning electron microscopy (SEM) images, X-ray diffraction (XRD), and extended X-ray absorption fine structure (EXAFS) spectra. It was shown that Cr(VI) was reduced to Cr(III) in the Cr(VI)-doped samples after heating within 500-900 °C. The present results also suggested that the chromium octahedral was bridged to the titanium tetrahedral and was incorporated in TiO2 minerals formed after 1000 °C treatment.

Original languageEnglish
Pages (from-to)1950-1955
Number of pages6
JournalJournal of Environmental Management
Volume90
Issue number5
DOIs
StatePublished - 04 2009
Externally publishedYes

Keywords

  • Chromium(VI)
  • Structure
  • Thermal stability
  • TiO powders

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