Title page for etd-0927108-180510


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URN etd-0927108-180510
Author Yi-hsun Chen
Author's Email Address No Public.
Statistics This thesis had been viewed 4751 times. Download 1373 times.
Department Environmental Engineering
Year 2008
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Reaction Behavior of Nanoscale Fe3O4 and [Fe3O4]MgO with Different Inorganic Pollutants (NO3-, Cd2+ and Cr6+) in Simulated Groundwater
Date of Defense 2008-07-11
Page Count 182
Keyword
  • Simulated Groundwater
  • [Fe3O4]MgO
  • Cr6+
  • Cd2+
  • NO3-
  • Nanoscale adsorbent
  • Abstract This study was to investigate the reaction behavior of laboratory-prepared nanoscale adsorbents (Fe3O4 and H-[Fe3O4]MgO) and inorganic pollutants (NO3-, Cd2+and Cr6+) in simulated groundwater. First, Fe3O4 and the composites of nanoscale Fe3O4 and MgO were prepared using chemical co-precipitation method. Then they were characterized and verified by various apparatuses and methods including X-ray diffractometry, scanning electron microscopy, Zetasizer, and specific surface area measurements. Second, the nanoscale adsorbents were used to adsorb inorganic pollutants in simulated groundwater of different conditions. The relevant reaction behavior and mechanisms were also investigated.
    Results of this research showed that Fe3O4 and H-[Fe3O4]MgO had the greater adsorption amount when the initial concentration of inorganic pollutants was higher than lower. The adsorption rate of inorganic pollutants at 28℃ was greater than that of at 18℃. The experimental results also showed that at a higher pH environment or the existence of humic acid in simulated groundwater would increase the removal efficiency of Cd2+, but decrease the removal efficiency of NO3- and Cr6+. 
    Analysis of inorganic pollutants adsorption on nanoscale adsorbents in simulated groundwater indicated that a Langmuir-type of chemical adsorption and pseudo-second-order reaction kinetic equation would have better fit. In this study, it was also found that nanoscale adsorbents not only adsorbed inorganic pollutants but also reduced NO3- and Cr6+ to NO2-, NH4+, and Cr3+ at pH=3, respectively. Thus, the nanoscale adsorbents (Fe3O4 and H-[Fe3O4]MgO) prepared and were capable of reductively adsorbing inorganic pollutants (e.g., NO3- and Cr6+) for environmental remediation.
    Advisory Committee
  • Ming-Ching Kuo - chair
  • Hsiu-Wei Chen - co-chair
  • Gordon C. C. Yang - advisor
  • Files
  • etd-0927108-180510.pdf
  • indicate accessible in a year
    Date of Submission 2008-09-27

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