Hydrophobic High Surface Area Zeolites Derived from Fly Ash for Oil Spill Remediation
2013; American Chemical Society; Volume: 47; Issue: 11 Linguagem: Inglês
10.1021/es3048174
ISSN1520-5851
AutoresTamilselvan Sakthivel, David L. Reid, Ian Goldstein, Larry L. Hench, Sudipta Seal,
Tópico(s)Methane Hydrates and Related Phenomena
ResumoFly 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.
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