Photocatalytic oxidation of organic pollutants on titania-clay composites.
TiO2/Ca-montmorillonite composites were prepared by wet grinding in an agate mill. Positively charged TiO2 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 0.5mM phenol was degraded by irradiation with UV-VIS light (lambda=250-440 and 540-590 nm) in suspensions of TiO2-clay composites and significant photodegradation was observed at 40-60% TiO2/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.
Ménesi
Judit
J
Department of Colloid Chemistry and Nanostructured Materials Research Group of Hungarian Academy of Sciences, University of Szeged, H-6720 Szeged, Aradi Vertanuk tere 1, Hungary.
Körösi
László
L
Bazsó
Eva
E
Zöllmer
Volker
V
Richardt
André
A
Dékány
Imre
I
D001546:Bentonite / Q000737:chemistry*; D002384:Catalysis; D000431:Ethanol / Q000737:chemistry / Q000528:radiation effects; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D019800:Phenol / Q000737:chemistry / Q000528:radiation effects; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014050:Toluene / Q000737:chemistry / Q000528:radiation effects; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects*; D018508:Water Purification / Q000379:methods
D014874:Water Pollutants, Chemical; D001546:Bentonite; C009495:titanium dioxide; D019800:Phenol; D014050:Toluene; D000431:Ethanol; D014025:Titanium