title: Photocatalytic treatment of pharmaceutical wastewater using new multiwall-carbon nanotubes/TiO2/SiO2 nanocomposites.
abstract: For the photocatalytic removal of bisphenol A (BPA) and carbamazepine (CBZ) from water solution a new multiwall-carbon nanotubes and TiO2/SiO2 nanocomposites (MWCNT-TiO2-SiO2) were applied. Nanocomposites with the addition of 0.15-17.8 wt% MWCNT show high potential for the removal of both pollutants. The starting concentration of each contaminant was halved during 20 min of UVA irradiation. The decomposition process of CBZ over investigated nanocomposites proceeded differently than it was observed for the classical photocatalyst P25. The kinetics of the removal followed as a pseudo-first order regime with the k1 in range 0.0827-0.1751 min(-1) for BPA and 0.0131-0.0743 min(-1) for CBZ. Toxicity to Vibrio fischeri and Daphnia magna was significantly reduced indicating formation of non-toxic products of photooxidation of tested contaminants.
authors.affiliation: Department of Environmental Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, Lublin, Poland. Electronic address: bczech@hektor.umcs.lublin.pl.
authors.forename: Bożena
authors.initials: B
authors.lastname: Czech
authors.affiliation: Department of Adsorption, Faculty of Chemistry, Maria Curie-Skłodowska University, Lublin, Poland.
authors.forename: Waldemar
authors.initials: W
authors.lastname: Buda
mesh_terms: D048908:Aliivibrio fischeri / Q000187:drug effects; D000818:Animals; D001559:Benzhydryl Compounds / Q000737:chemistry; D002220:Carbamazepine / Q000737:chemistry; D002384:Catalysis; D003621:Daphnia / Q000187:drug effects; D053768:Metal Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry; D010782:Photolysis; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification / Q000295:instrumentation*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D002220:Carbamazepine; D037742:Nanotubes, Carbon; D010636:Phenols; D012822:Silicon Dioxide; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C507641:TiO2-SiO2; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Bisphenol A; Carbamazepine; Nanocomposites; Photocatalysis; TiO(2)