Degradation of 4-hydroxybenzoic acid by combined ultrasound irradiation and catalytic wet peroxide oxidation

Nikolopoulos, AN; Igglessi-Markopoulou, O; Papayannakos, N

dc.contributor.author	Nikolopoulos, AN	en
dc.contributor.author	Igglessi-Markopoulou, O	en
dc.contributor.author	Papayannakos, N	en
dc.date.accessioned	2014-03-01T02:42:33Z
dc.date.available	2014-03-01T02:42:33Z
dc.date.issued	2004	en
dc.identifier.issn	1350-4177	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/31047
dc.subject	4-hydroxybenzoic acid	en
dc.subject	Catalytic wet peroxide oxidation	en
dc.subject	Ultrasound	en
dc.subject	Wastewater treatment	en
dc.subject.classification	Acoustics	en
dc.subject.classification	Chemistry, Multidisciplinary	en
dc.subject.other	Catalysis	en
dc.subject.other	Degradation	en
dc.subject.other	Diffusion	en
dc.subject.other	Oxidation	en
dc.subject.other	Reduction	en
dc.subject.other	Sonochemistry	en
dc.subject.other	Ultrasonics	en
dc.subject.other	Diffusion resistance	en
dc.subject.other	Sonication	en
dc.subject.other	Carboxylic acids	en
dc.subject.other	4 hydroxybenzoic acid	en
dc.subject.other	aluminum	en
dc.subject.other	iron	en
dc.subject.other	peroxide	en
dc.subject.other	catalyst	en
dc.subject.other	clay	en
dc.subject.other	conference paper	en
dc.subject.other	degradation	en
dc.subject.other	diffusion	en
dc.subject.other	irradiation	en
dc.subject.other	oxidation	en
dc.subject.other	powder	en
dc.subject.other	priority journal	en
dc.subject.other	time	en
dc.subject.other	ultrasound	en
dc.title	Degradation of 4-hydroxybenzoic acid by combined ultrasound irradiation and catalytic wet peroxide oxidation	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/j.ultsonch.2004.01.029	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ultsonch.2004.01.029	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The aim of this study is to explore the potential benefits from the combined use of ultrasound irradiation and catalytic wet peroxide oxidation for the degradation of 4-hydroxybenzoic acid (4-HBA). The target compound degradation was studied under direct and indirect sonication, while silent conditions were employed as reference. The catalyst, a mixed (Al-Fe) pillared clay named FAZA, was in the form of powder and of extrudates. In the case of extrudates it was observed that ultrasound improves the catalyst performance due to reduction of diffusion resistance, thereby increasing the conversion after 4 h by 12-15 times. Increasing the initial concentration of 4-HBA was found to lead to lower conversion. The combined ultrasonic/catalytic process appears very promising for environmental applications. (C) 2004 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Ultrasonics Sonochemistry	en
dc.identifier.doi	10.1016/j.ultsonch.2004.01.029	en
dc.identifier.isi	ISI:000221062200014	en
dc.identifier.volume	11	en
dc.identifier.issue	3-4	en
dc.identifier.spage	183	en
dc.identifier.epage	186	en