Oxidation of printed circuit board wastes in supercritical water

Yi Chi Chien, H. Paul Wang, Kuen Song Lin, Y. W. Yang

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


A feasibility study for oxidation of printed circuit board wastes with NaOH in supercritical water has been investigated. Experimentally, Br species in the printed circuit board resin was abstracted by sodium cations and the destruction efficiency of the waste was enhanced in the supercritical water oxidation (SCWO) process. By X-ray diffraction (XRD) spectroscopy, Cu2O, CuO, and Cu(OH)2 were found in the SWCO solid residue of the printed circuit board wastes. The extended X-ray absorption fine structural (EXAFS) spectra indicated that the bond distance of Cu-O in the residue was 1.87 Å with a coordination number of 2.61. Since the Cu-Br species was not observed by XRD and EXAFS spectroscopies, one may eliminate the possibility that the copper was involved in the abstraction of bromine species from the resin matrix in the SCWO process. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)4279-4283
Number of pages5
JournalWater Research
Issue number17
Publication statusPublished - 2000 Dec

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ecological Modelling
  • Pollution
  • Waste Management and Disposal
  • Environmental Engineering
  • Civil and Structural Engineering


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