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.
ASJC Scopus subject areas
- Filtration and Separation