Surface modification of high calcium fly ash for its application in oil spill clean up

Karakasi, OK; Moutsatsou, A

dc.contributor.author	Karakasi, OK	en
dc.contributor.author	Moutsatsou, A	en
dc.date.accessioned	2014-03-01T01:34:43Z
dc.date.available	2014-03-01T01:34:43Z
dc.date.issued	2010	en
dc.identifier.issn	0016-2361	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20812
dc.subject	High calcium fly ash	en
dc.subject	Oil spill	en
dc.subject	Sodium oleate	en
dc.subject	Sorbent	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Aqueous solutions	en
dc.subject.other	Clean up	en
dc.subject.other	Dry environment	en
dc.subject.other	Environmental fields	en
dc.subject.other	Fine particles	en
dc.subject.other	Heating oil	en
dc.subject.other	High-calcium fly ash	en
dc.subject.other	Hydrophobic character	en
dc.subject.other	Hydrothermal treatments	en
dc.subject.other	Industrial by-products	en
dc.subject.other	Light cycle oil	en
dc.subject.other	Mass ratio	en
dc.subject.other	Ocean water	en
dc.subject.other	Oil sorption	en
dc.subject.other	Semi-solids	en
dc.subject.other	Sodium oleate	en
dc.subject.other	Solution concentration	en
dc.subject.other	Surface modification	en
dc.subject.other	Water surface	en
dc.subject.other	Calcium	en
dc.subject.other	Carbonate minerals	en
dc.subject.other	Crude oil	en
dc.subject.other	Dewatering	en
dc.subject.other	Fly ash	en
dc.subject.other	Oil spills	en
dc.subject.other	Sodium	en
dc.subject.other	Solutions	en
dc.subject.other	Sorption	en
dc.subject.other	Surfaces	en
dc.subject.other	Marine pollution	en
dc.title	Surface modification of high calcium fly ash for its application in oil spill clean up	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.fuel.2010.06.029	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.fuel.2010.06.029	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The present study aims at utilising an inorganic industrial by-product, high calcium fly ash (HCFA), in an environmental field: oil spill clean up. Properties, such as fine particle size, floating ability, hydrophobic character and porosity, make this material attractive for such a use. In order to investigate the oil sorption behaviour of HCFA an oil spill has been simulated, by using artificial ocean water and three types of oil (heating oil (HO), light cycle oil (LCO) and Iranian light crude oil (ILCO)). Two HCFA samples, a Ca-rich one (AD) and a Si-rich one (M), have been examined, so as to investigate the role of HCFA composition in its behaviour. The addition of HCFA to an oil spill results in the formation of a semi-solid oil-HCFA phase, allowing the quite total removal of oil from the water surface. HCFA's oil sorption capacity in dry environment after 24 h is 0.7-0.9 g oil/g HCFA for AD and 0.5-0.6 g oil/g HCFA for M. HCFA's behaviour, when added to an oil spill, necessitates the amelioration of its floating ability and affinity for oil and to this direction its hydrothermal treatment in an aqueous solution of sodium oleate (SO) under several conditions (time, temperature, HCFA: SO mass ratio, SO solution concentration, solution: HCFA ratio) has been applied. The treatment of the calcareous HCFA (AD) at 25 degrees C at a mass ratio HCFA: SO = 1: 0.004 results in the formation of a cohesive semi-solid oil-HCFA phase, allowing the total removal of oil from the water surface, while the siliceous HCFA (M) requires a greater amount of SO (HCFA: SO = 1: 0.5). The oil sorption behaviour of both HCFA and SO-modified HCFA seems to be related to the initial CaO content. During the treatment with SO, CaO is converted to calcite and calcium oleate, which contributes to the improvement of HCFA's floating ability, due to its greater affinity for oil. (C) 2010 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Fuel	en
dc.identifier.doi	10.1016/j.fuel.2010.06.029	en
dc.identifier.isi	ISI:000282086200046	en
dc.identifier.volume	89	en
dc.identifier.issue	12	en
dc.identifier.spage	3966	en
dc.identifier.epage	3970	en