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Updated: Nov 27, 2025
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
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Lead removal by ThioOctolig.
Dean F Martin1, Kirpal S Bisht1
1Department of Chemistry, University of South Florida, Tampa, Florida, USA.
Summary
Modified silica gel, ThioOctolig, significantly enhances lead ion removal from water. This sulfur-modified material achieved 99.4% lead removal, a substantial improvement over the original Octolig.
Area of Science:
- Environmental Chemistry
- Materials Science
- Adsorption Technology
Background:
- Octolig, a silica gel modified with polyethylene diamine, is commercially available.
- Effective removal of lead ions from aqueous solutions is crucial for environmental remediation.
- Incorporating sulfur into Octolig aims to improve its lead ion adsorption capacity.
Purpose of the Study:
- To synthesize a sulfur-modified adsorbent, ThioOctolig, from Octolig.
- To evaluate the efficiency of ThioOctolig in removing lead ions from aqueous solutions.
- To investigate methods for enhancing sulfur incorporation into the Octolig matrix.
Main Methods:
- Octolig was reacted with thioacetamide in toluene under various conditions (time, temperature, acid presence).
- Antimony trichloride (SbCl3) was explored as a catalyst for sulfur incorporation.
- Sulfur content was analyzed, and lead ion removal efficiency was tested using 120 ppm aqueous lead solutions.
Main Results:
- Direct reaction of Octolig with thioacetamide resulted in limited sulfur incorporation (approx. 20%).
- Acidification during reaction did not improve sulfur content and yielded poorer results.
- SbCl3 as a catalyst did not enhance sulfur content but produced a distinct color change; however, a ThioOctolig sample with 10% sulfur removed 99.4% of lead ions, compared to 68% for unmodified Octolig.
Conclusions:
- Sulfur incorporation into Octolig significantly enhances lead ion removal efficiency.
- ThioOctolig demonstrates superior performance in adsorbing lead ions compared to the parent material.
- Further investigation into reaction conditions, such as temperature, may optimize sulfur incorporation.
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