Hydrophobic high surface area zeolites derived from fly ash for oil spill remediation
| Autor: | Larry L. Hench, Sudipta Seal, Ian Goldstein, Tamilselvan Sakthivel, David L. Reid |
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| Rok vydání: | 2013 |
| Předmět: |
Sorbent
Waste management Chemistry Surface Properties Coal combustion products Spectrometry X-Ray Emission Sorption General Chemistry Silanes Coal Ash Adsorption Chemical engineering Fly ash Specific surface area Microscopy Electron Scanning Zeolites Environmental Chemistry Surface modification Petroleum Pollution Recycling Zeolite Hydrophobic and Hydrophilic Interactions Environmental Restoration and Remediation |
| Zdroj: | Environmental sciencetechnology. 47(11) |
| ISSN: | 1520-5851 |
| Popis: | Fly ash, a coal combustion byproduct with a predominantly aluminosilicate composition, is modified to develop an inexpensive sorbent for oil spill remediation. The as-produced fly ash is a hydrophilic material with poor sorption capacity. A simple two-step chemical modification process is designed to improve the oil sorption capacity. First, the fly ash was transformed to a zeolitic material via an alkali treatment, which increased the specific surface area up to 404 m(2) g(-1). Then, the material was surface functionalized to form a hydrophobic material with high contact angle up to 147° that floats on the surface of an oil-water mixture. The reported oil sorption capacities of X-type zeolite sorbent with different surface functionalization (propyl-, octyl-, octadecyl-trimethoxysilane and esterification) were estimated to 1.10, 1.02, 0.86, and 1.15 g g(-1), respectively. Oil sorption was about five times higher than the as-received fly ash (0.19 g g(-1)) and also had high buoyancy critical for economic cleanup of oil over water. |
| Databáze: | OpenAIRE |
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