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12:59
A Study of the Complexation of MercuryII with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
Published on: January 8, 2016
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A novel pre-oxidation method for elemental mercury removal utilizing a complex vaporized absorbent.
Yi Zhao1, Runlong Hao1, Qing Guo1
1School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, P.R. China.
Journal of Hazardous Materials
|August 23, 2014
Summary
A new semi-dry method effectively removes elemental mercury (Hg(0)) using a complex absorbent. This process also efficiently removes sulfur dioxide (SO2) and nitrogen oxides (NO) simultaneously.
Area of Science:
- Environmental Chemistry
- Chemical Engineering
- Pollution Control
Background:
- Elemental mercury (Hg(0)) is a major industrial pollutant.
- Effective removal of Hg(0) from flue gas is crucial for environmental protection.
- Existing methods face challenges in efficiency and integration.
Purpose of the Study:
- To develop and evaluate a novel semi-dry integrative method for Hg(0) removal.
- To investigate the simultaneous removal of SO2, NO, and Hg(0).
- To elucidate the reaction mechanism of the integrated removal process.
Main Methods:
- Utilized a liquid-phase complex absorbent (LCA) for Hg(0) pre-oxidation.
- Employed calcium hydroxide (Ca(OH)2) for Hg(2+) absorption.
- Optimized LCA composition (Fenton reagent, peracetic acid, NaCl) and reaction conditions (pH, addition rate).
- Analyzed removal products using X-ray diffraction (XRD) and atomic fluorescence spectrometry (AFS).
Main Results:
- Peracetic acid and NaCl were identified as optimal additives for Hg(0) oxidation.
- LCA pH and addition rate significantly influenced Hg(0) removal efficiency.
- Optimal conditions achieved 91% Hg(0) removal efficiency.
- Simultaneous removal efficiencies reached 100% for SO2, 79.5% for NO, and 80.4% for Hg(0).
Conclusions:
- The proposed semi-dry integrative method is highly effective for Hg(0) removal.
- The method demonstrates significant potential for simultaneous removal of SO2, NO, and Hg(0).
- Reaction mechanisms were elucidated through product analysis and electrochemical studies.
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