Removal of Mercury from Waste Solutions Using Sulfur-Modified Silica-Polyamine Composites

Removal of Mercury from Waste Solutions Using Sulfur-Modified Silica-Polyamine Composites 

We previously reported the synthesis of thiol-modified silica-polyamine composite using ethylene sulfide. Although the reaction of ethylene sulfide with WP-1 gave a material that had excellent mercury capture characteristics, this ligand is toxic and difficult to make and handle. In addition, ethylene sulfide polymerizes with itself in the presence of nucleophiles therefore, we could not tell if we were dealing with an amino-thiol ligand (Fig. 16 ) or a polysulfide ligand (Fig. 165).27 

The ethylene-sulfide-modified material gave a sulfur-containing derivative that had excellent capture kinetics for removing mercury, cadmium, and lead from 

therefore, set out to find an alternative to this composite material for remediation and immobilization of toxic metals. Table 5 shows the results of the elemental analyses for the various polymer composites and the materials resulting from their reaction with the listed sulfur-containing ligands. Several important conclusions can be drawn from these data. First, none of the chloroalkyl sulfide ligands 

Ratio obtained for sulfur analysis was divided by 2 (because there are 2 sulflirs in CS2). 

---