Mercury removal from acidic waste solutions using a thiol functional organo-ceramic adsorbent

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Abstract

Removal of mercury from highly acidic (1-2 M acid concentrations) waste solutions using a novel thiol-functionalized organo-ceramic adsorbent (SOL-AD-IV) has been investigated. The viability of mercury extraction was tested by employing Idaho National Engineering and Environmental Laboratory (INEEL) aluminum calcine and sodium bearing waste (SBW) surrogates. A maximum equilibrium uptake capacity of 740 mg/g in the 1-2 M acid concentrations was found, indicating a 1:1 adsorption ratio between Hg(NO3)20 and thiol (SH). Loss of uptake activity due to high contents of aluminum, nitrate, and hydrogen ions was not evident. Over 99.7 wt% extraction efficiency was observed up to 4 M HNO3 solutions. Rapid kinetics were observed with an extraction efficiency of >91 wt% within 5 min of reaction time. Dynamic adsorption of mercury on a fixed bed demonstrated a removal capacity of 680 mg/g and effluent concentrations as low 0.005 mg/L. Results showed applicability of this material for effective removal of mercury from highly acidic waste solutions.

Original languageEnglish (US)
Pages (from-to)899-913
Number of pages15
JournalSolvent Extraction and Ion Exchange
Volume21
Issue number6
DOIs
StatePublished - Nov 2003

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Keywords

  • Mercury
  • Removal
  • Thiol

ASJC Scopus subject areas

  • Filtration and Separation
  • Chemistry(all)

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