Document Type
Patent
Publication Date
March 2007
Patent Number
7193114
Abstract
The present invention attaches a molecule that contains a hydroxyl group (OH) attached to a carbon chain which is attached to a coordinating atom or atoms, the acidity of which is greater than that of silica (i.e., pKA <10). The condensation is achieved by mixing silica gel, appropriate amount of ligand, and a drop of conc. sulfuric acid in toluene in a flask attached to a Dean-Stark tube. Heating of the mixture is continued until the amount of water, obtained by azeotropic distillation and condensation, reaches a constant value. Toluene is filtered off, and recycled. The supported ligand is dried under reduced pressure to remove residual toluene. The composite (ligand attached to silica) can then be used by batch or column method to remove heavy metal ions from aqueous solution.
Application Number
10/707,814
Recommended Citation
Martin, Dean F. and Bowe, Craig A., "Extraction of metals by mercaptans attached to silica gel by azeotropic distillation" (2007). USF Patents. 624.
https://digitalcommons.usf.edu/usf_patents/624
Assignees
University of South Florida
Filing Date
01/14/2004
Primary/U.S. Class
568/62
