skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Separation of complexed mercury from aqueous wastes using self-assembled mercaptan on mesoporous silica

Abstract

Separation of Hg(II) from potassium iodide/sulfate wastes was studied using a novel mesoporous silica material containing self-assembled mercaptan groups. The adsorbent, consisting of self-assembled mercaptan on mesoporous silica (SAMMS) developed at Pacific Northwest National Laboratory (PNNL), was characterized as to its specificity, adsorption capacity, and kinetics for separation of mercury from potassium iodide/sulfate solutions. Aqueous speciation calculations indicated that a major fraction (92--99%) of dissolved mercury in the potassium iodide/sulfate wastes solutions existed as HgI{sub 4}{sup 2{minus}} species. The adsorption data showed that the mercury adsorption capacity of SAMMS material increased with decreasing iodide concentrations. The magnitude of calculated free energy of adsorption indicated that mercury adsorption on this adsorbent is typical of soft acid-soft base interactions. High specificity for anionic complexes of Hg(II) by the SAMMS material was confirmed by distribution coefficient measurements. The kinetics data indicated that the adsorption reactions occur very rapidly independent of Hg(II) concentrations and pH. These tests confirmed that SAMMS material can very effectively remove strongly complexed Hg(II) from aqueous wastes.

Authors:
; ; ; ;  [1]
  1. Pacific Northwest National Lab., Richland, WA (United States)
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
691483
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Journal Article
Journal Name:
Separation Science and Technology
Additional Journal Information:
Journal Volume: 34; Journal Issue: 12; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; MERCURY COMPLEXES; ADSORPTION; SILICA; SORPTIVE PROPERTIES; THIOLS; LIQUID WASTES; LOW-LEVEL RADIOACTIVE WASTES; ALPHA-BEARING WASTES; RADIOACTIVE WASTE PROCESSING

Citation Formats

Mattigod, S.V., Feng, X., Fryxell, G.E., Liu, J., and Gong, M. Separation of complexed mercury from aqueous wastes using self-assembled mercaptan on mesoporous silica. United States: N. p., 1999. Web. doi:10.1081/SS-100100775.
Mattigod, S.V., Feng, X., Fryxell, G.E., Liu, J., & Gong, M. Separation of complexed mercury from aqueous wastes using self-assembled mercaptan on mesoporous silica. United States. doi:10.1081/SS-100100775.
Mattigod, S.V., Feng, X., Fryxell, G.E., Liu, J., and Gong, M. Wed . "Separation of complexed mercury from aqueous wastes using self-assembled mercaptan on mesoporous silica". United States. doi:10.1081/SS-100100775.
@article{osti_691483,
title = {Separation of complexed mercury from aqueous wastes using self-assembled mercaptan on mesoporous silica},
author = {Mattigod, S.V. and Feng, X. and Fryxell, G.E. and Liu, J. and Gong, M.},
abstractNote = {Separation of Hg(II) from potassium iodide/sulfate wastes was studied using a novel mesoporous silica material containing self-assembled mercaptan groups. The adsorbent, consisting of self-assembled mercaptan on mesoporous silica (SAMMS) developed at Pacific Northwest National Laboratory (PNNL), was characterized as to its specificity, adsorption capacity, and kinetics for separation of mercury from potassium iodide/sulfate solutions. Aqueous speciation calculations indicated that a major fraction (92--99%) of dissolved mercury in the potassium iodide/sulfate wastes solutions existed as HgI{sub 4}{sup 2{minus}} species. The adsorption data showed that the mercury adsorption capacity of SAMMS material increased with decreasing iodide concentrations. The magnitude of calculated free energy of adsorption indicated that mercury adsorption on this adsorbent is typical of soft acid-soft base interactions. High specificity for anionic complexes of Hg(II) by the SAMMS material was confirmed by distribution coefficient measurements. The kinetics data indicated that the adsorption reactions occur very rapidly independent of Hg(II) concentrations and pH. These tests confirmed that SAMMS material can very effectively remove strongly complexed Hg(II) from aqueous wastes.},
doi = {10.1081/SS-100100775},
journal = {Separation Science and Technology},
number = 12,
volume = 34,
place = {United States},
year = {1999},
month = {9}
}