Methods for accelerating nitrate reduction using zerovalent iron at near-neutral pH: Effects of H2-reducing pretreatment and copper deposition

Y. H. Liou, S. L. Lo, C. J. Lin, C. Y. Hu, W. H. Kuan, S. C. Weng

研究成果: 雜誌貢獻文章

81 引文 斯高帕斯(Scopus)

摘要

Both surface treatments, H2-reducing pretreatment at 400 °C and the deposition of copper as a catalyst, were attempted to enhance the removal of nitrate (40 (mg N) L-1) using zerovalent iron in a HEPES buffered solution at a pH of between 6.5 and 7.5. After the iron surface was pretreated with hydrogen gas, the removal of the passive oxide layers that covered the iron was indicated by the decline in the oxygen fraction (energy dispersive X-ray analysis) and the overlap of the cyclic polarization curves. The reaction rate was doubled, and the lag of the early period disappeared. Then, the deposition of copper onto freshly pretreated iron promoted nitrate degradation more effectively than that onto a nonpretreated iron surface, because of the high dispersion and small size of the copper particles. An optimum of 0.25-0.5% (w/w) Cu/Fe accelerated the rate by more than six times that of the nonpretreated iron. The aged 0.5% (w/w) Cu/Fe with continual dipping in nitrate solution for 20 days completely restored its reactivity by a regeneration process with H2 reduction. Hence, these two iron surface treatments considerably promoted the removal of nitrate from near-neutral water; the reactivity of Cu/Fe was effectively recovered.

原文英語
頁(從 - 到)9643-9648
頁數6
期刊Environmental Science and Technology
39
發行號24
DOIs
出版狀態已發佈 - 十二月 15 2005
對外發佈Yes

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

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