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Title: Photocatalytic treatment of pharmaceutical wastewater using new multiwall-carbon nanotubes/TiO{sub 2}/SiO{sub 2} nanocomposites

For the photocatalytic removal of bisphenol A (BPA) and carbamazepine (CBZ) from water solution a new multiwall-carbon nanotubes and TiO{sub 2}/SiO{sub 2} nanocomposites (MWCNT–TiO{sub 2}–SiO{sub 2}) 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 k{sub 1} in range 0.0827–0.1751 min{sup −1} for BPA and 0.0131–0.0743 min{sup −1} for CBZ. Toxicity to Vibrio fischeri and Daphnia magna was significantly reduced indicating formation of non-toxic products of photooxidation of tested contaminants. - Highlights: • MWCNT enhanced TiO{sub 2} activity in UVA and the removal of BPA and CBZ. • At least 50% PPCPs removal during 30 min of photocatalytic treatment was observed. • MWCNT changed the mechanism of CBZ decomposition but not BPA. • Decomposition products of both BPA and CBZ possessed low toxicity. • Photocatalysis may be recommended for the initial treatment of pharmaceutical wastewater.
Authors:
 [1] ;  [2]
  1. Department of Environmental Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, Lublin (Poland)
  2. Department of Adsorption, Faculty of Chemistry, Maria Curie-Skłodowska University, Lublin (Poland)
Publication Date:
OSTI Identifier:
22483276
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Research; Journal Volume: 137; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ABUNDANCE; AQUEOUS SOLUTIONS; CARBON NANOTUBES; CONCENTRATION RATIO; DAPHNIA; DECOMPOSITION; DRUGS; ECOLOGICAL CONCENTRATION; IRRADIATION; NANOCOMPOSITES; PHOSPHORUS 25; PHOTOCATALYSIS; POLLUTANTS; SILICA; SILICON OXIDES; TITANIUM OXIDES; TOXICITY; WASTE WATER