In situ XANES study of removal of heavy metals from laboratory wasteliquid by the ferrite process

Chiu Hui Tu, Yuh Jeen Huang, Cheng Hsien Tsai, C. J.Monica Chin

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Heavy metals in the laboratory wasteliquid can be recovered as stable and economic ferrite by the ferrite process. The spectrum of X-ray absorption near edge structure (XANES) specifically shows that 92% of Cr(OH)3 and 8% of CrCl2 in the original laboratory wasteliquid are converted to 70% of Cr2O3 and 30% of CrCl2 in the precipitates by the ferrite process. The concentrations of total chromium, lead and zinc in the laboratory wasteliquid also dropped from 383,000, 20.9 and 277 ppb, respectively, to lower than the effluent standards of the Environmental Protection Administration (EPA) in Taiwan. The XRD (X-ray diffraction) analysis shows that the chromium ferrite is achieved at pH > 9. On the other hand, the XANES spectra of the in situ experiment show there were 52% of Fe3O4 in the precipitates.

Original languageEnglish
Pages (from-to)228-231
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume156-158
DOIs
StatePublished - May 2007

Keywords

  • Chromium ferrite
  • Heavy metals
  • Laboratory wasteliquid
  • XANES
  • XRD

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