Title page for etd-0526116-220750


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URN etd-0526116-220750
Author Yung-Sen Hsu
Author's Email Address No Public.
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Department Environmental Engineering
Year 2015
Semester 2
Degree Ph.D.
Type of Document
Language zh-TW.Big5 Chinese
Title Comparison of granular activated carbon and carbon
nanotubes for adsorption of perchlorate from aqueous
solution
Date of Defense 2016-06-02
Page Count 116
Keyword
  • Adsorption model
  • Perchlorate
  • Adsorption
  • GAC
  • CNT
  • Abstract This study is focused to compare the adsorption of perchlorate by using granular activated carbon (GAC) and carbon nanotubes (CNT) in synthetically solutions, and to investigate their adsorption capacities and the effects of operation conditions on these adsorptions. In this study GAC and CNT as adsorbents were be carried to isothermal equilibrium and to obtain adsorption models for understanding the adsorption mechanisms of perchlorate by GAC and CNT. Finally thermodynamics and related constants of perchlorate adsorbed by GAC and CNT were discussed with the experimental results of kinetic adsorption.
    Experimental results showed the adsorption capacities of perchlorate by GAC and CNT were at 28.2–33.9 mg/g and 10.0 – 13.6 mg/g respectively under a thermostat range 5-45 ℃ of isothermal tests. The all tests results of GAC and CNT were all suitable Langmuir and Freundlich models. In experiments on adsorption of perchlorate by two kinds of adsorbents, results show that dynamics approximately 8 hours to reach equilibrium of adsorption. The adsorption increased and decreased with the increased ionic strengths and concentrations of perchlorate.
    The results of kinetic study showed the adsorption of perchlorate by GAC and CNT could all described by Modified Freundlich equation、Pseudo-1st-order equation、Pseudo-2nd-order equation. The constants of thermodynamic on CNT are : ΔGo were in range of - 0.77 ~ - 0.80 kcal/mol , △Ho were in range of - 0.6 kcal/mol, and △So were in range of 0.53 ~ 0.72 cal/mol-K. The constants of thermodynamic on GAC are : ΔGo were in range of - 0.99 ~ - 1.11 kcal/mol, △Ho were in range of - 0.6 kcal/mol, and △So were in range of 1.21 ~ 1.84 cal/mol-K. The reactions of perchlorate adsorbed on GAC and CNT were all belonging to spontaneously exothermic reactions.
    Advisory Committee
  • Rui-Ren Chen - chair
  • Yung-Chang Lin - co-chair
  • Chih-Huang Weng - co-chair
  • Chil-Ming Kao - co-chair
  • Shih-Wei Huang - co-chair
  • Ming-Shen Chou - advisor
  • Jie-Chung Lou - advisor
  • Files
  • etd-0526116-220750.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2016-06-26

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