Journal of Thermal Analysis and Calorimetry

, Volume 119, Issue 3, pp 1663–1672 | Cite as

Evaluation of elemental mercury adsorption by fly ash modified with ammonium bromide

  • Yongzheng Gu
  • Yongsheng Zhang
  • Lvrong Lin
  • Hong Xu
  • William Orndorff
  • Wei-Ping Pan
Article

Abstract

Coal-fired power plants are significant contributors to the anthropogenic emission of mercury. This study focus on evaluated the methods for modification and preparation of fly ash adsorbent which can be applied to adsorb mercury from power plants. Comparing with isometric impregnation and ion exchange method, it was found that the cost and preparation time of the mechanochemical method significantly reduced. Hg0 adsorption performances of NH4Br-modified fly ashes and subsequent effects of mechanical energy on modifying fly ash were investigated, and the results indicated that increasing mechanical force can make the distribution of bromides to be more uniform and increase the number of surface active sites and groups. Furthermore, Hg0 removal efficiency improved significantly with the increasing bromine loading at 150 °C. There is a positive correlation between mechanical energy on modifying fly ash and subsequently Hg0 adsorption performance. TG/MS analysis was utilized to determine the thermal stability and released material of different samples. Results demonstrated the release of ammonia, which from the modified fly ashes with mechanochemical method, most likely enhances the oxidation and subsequent adsorption of mercury in the 150–200 °C temperature range. All results revealed that the mechanochemical application method for adsorbent preparation on site is competitive on economy, practicability, and mercury removal efficiency.

Keywords

Mercury adsorption Fly ash Ammonium bromide Mechanochemical method 

Notes

Acknowledgements

Financial support from the National High Technology Research and Development Program of China (No. 2013AA065404), 111 Project (B12034) and Fundamental Research Funds for the Central Universities (13ZD04) is gratefully acknowledged.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2015

Authors and Affiliations

  • Yongzheng Gu
    • 1
  • Yongsheng Zhang
    • 1
  • Lvrong Lin
    • 1
  • Hong Xu
    • 1
  • William Orndorff
    • 2
  • Wei-Ping Pan
    • 1
    • 2
  1. 1.Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of EducationNorth China Electric Power UniversityBeijingPeople’s Republic of China
  2. 2.Institute of Combustion Science and Environmental TechnologyWestern Kentucky UniversityBowling GreenUSA

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