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Hg(0) absorption in potassium persulfate solution.

Qun-feng Ye1, Cheng-yun Wang, Da-hui Wang

  • 1Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China. qunfengye@163.com

Journal of Zhejiang University. Science. B
|April 15, 2006
PubMed
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This study shows potassium persulfate and silver ions effectively remove gaseous elemental mercury (Hg(0)) in water. Optimal removal occurs in neutral solutions, with higher reactant concentrations improving efficiency.

Area of Science:

  • Environmental Chemistry
  • Mercury Remediation
  • Oxidation Processes

Background:

  • Gaseous elemental mercury (Hg(0)) poses significant environmental and health risks.
  • Effective methods for Hg(0) oxidation in aqueous phases are crucial for pollution control.

Purpose of the Study:

  • To investigate the aqueous phase oxidation of gaseous elemental mercury (Hg(0)) using potassium persulfate (KPS) catalyzed by silver ions (Ag+).
  • To evaluate the impact of various parameters on Hg(0) removal efficiency.

Main Methods:

  • Utilized a glass bubble column reactor for the oxidation experiments.
  • Measured Hg(0) concentrations using cold vapor atom absorption (CVAA) and potassium persulfate using ion chromatography (IC).
  • Systematically studied the effects of pH, KPS concentration, silver nitrate (SN) concentration, temperature, inlet Hg(0) concentration, and tertiary butanol (TBA).

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Main Results:

  • Hg(0) removal efficiency increased with higher concentrations of KPS and SN.
  • Elevated temperatures and the presence of TBA (a radical scavenger) negatively impacted removal efficiency.
  • Neutral pH conditions favored Hg(0) removal, though this effect was mitigated by adding AgNO(3).
  • Higher inlet Hg(0) concentrations positively influenced removal efficiency.

Conclusions:

  • Aqueous phase oxidation by KPS catalyzed by Ag+ is a viable method for gaseous Hg(0) removal.
  • Optimizing KPS and Ag+ concentrations, along with pH control, enhances mercury removal.
  • The study provides insights into the reaction mechanism for mercury oxidation.