Photocatalytic oxidation of organic pollutants on titania–clay composites

TiO 2/Ca-montmorillonite composites were prepared by wet grinding in an agate mill. Positively charged TiO 2 nanoparticles are bound to the surface of the negatively charged montmorillonite layers via heterocoagulation; the clay mineral is used as adsorbent and support for the photooxidation process...

Full description

Saved in:

Bibliographic Details
Published in:	Chemosphere (Oxford) Vol. 70; no. 3; pp. 538 - 542
Main Authors:	Ménesi, Judit, Körösi, László, Bazsó, Éva, Zöllmer, Volker, Richardt, André, Dékány, Imre
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 2008 Elsevier
Subjects:	Applied sciences Atmospheric pollution Bentonite - chemistry Ca-montmorillonite Catalysis Catalysts: preparations and properties Chemistry Ethanol Ethanol - chemistry Ethanol - radiation effects Exact sciences and technology General and physical chemistry General processes of purification and dust removal General purification processes Nanostructures - chemistry Oxidation-Reduction Phenol Phenol - chemistry Phenol - radiation effects Photocatalysis Photochemistry Pollution Prevention and purification methods Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Titanium - chemistry Titanium-dioxide Toluene Toluene - chemistry Toluene - radiation effects Ultraviolet Rays Wastewaters Water Pollutants, Chemical - chemistry Water Pollutants, Chemical - radiation effects Water Purification - methods Water treatment and pollution Ca-montmorillonite Phenol Ethanol Photocatalysis Toluene Titanium-dioxide Nanoparticle Alcohol Supported catalyst Visible radiation Aromatic compound Nanocomposite Oxidation Organic compounds Photochemical degradation Clay Hydrocarbon Montmorillonite Inorganic adsorbent Heterogeneous catalysis Ultraviolet radiation Physicochemical purification Waste water purification Titanium oxide Flue gas purification Photooxidation
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	TiO 2/Ca-montmorillonite composites were prepared by wet grinding in an agate mill. Positively charged TiO 2 nanoparticles are bound to the surface of the negatively charged montmorillonite layers via heterocoagulation; the clay mineral is used as adsorbent and support for the photooxidation process. Aquatic solution of 0.5 mM phenol was degraded by irradiation with UV–VIS light ( λ = 250–440 and 540–590 nm) in suspensions of TiO 2–clay composites and significant photodegradation was observed at 40–60% TiO 2/Ca-montmorillonite compositions. Synergistic effect was detected at solid/liquid interface for degradation of phenol and at solid/gas interface in the recycling flow reactors for photooxidation of ethanol and toluene vapors.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0045-6535 1879-1298
DOI:	10.1016/j.chemosphere.2007.06.049