Impact of water quality on removal of carbamazepine in natural waters by N-doped TiO2 photo-catalytic thin film surfaces

JOURNAL OF HAZARDOUS MATERIALS

卷:244

Article

Avisar, Dror¹  Horovitz, Inna^1,2  Lozzi, Luca³  Ruggieri, Fabrizio³  Baker, Mark⁴  Abel, Marie-Laure⁴  Mamane, Hadas² 

[1] Tel Aviv Univ, Fac Geog & Environm, Hydrochem Lab, IL-69978 Tel Aviv, Israel

[2] Tel Aviv Univ, Fac Engn, Sch Mech Engn, IL-69978 Tel Aviv, Israel

[3] Univ Aquila, Dept Phys & Chem Sci, I-67010 Laquila, Italy

[4] Univ Surrey, Fac Engn & Phys Sci, Surface Anal Lab, Guildford GU2 7XH, Surrey, England

关键词: N-doped TiO2;    Photocatalytic activity;    Carbamazepine;    NOM;    Water treatment;   

DOI  :  10.1016/j.jhazmat.2012.09.058

来源: Elsevier

【 摘 要 】

Photocatalytic experiments on the pharmaceutical pollutant carbamazepine (CBZ) were conducted using sol-gel nitrogen-doped TiO2-coated glass slides under a solar simulator. CBZ was stable to photodegradation under direct solar irradiation. No CBZ sorption to the catalyst surface was observed, as further confirmed by surface characterization using X-ray photoelectron spectroscopic analysis of N-doped TiO2 surfaces. When exposing the catalyst surface to natural organic matter (NOM), an excess amount of carbon was detected relative to controls, which is consistent with NOM remaining on the catalyst surface. The catalyst surface charge was negative at pH values from 4 to 10 and decreased with increasing pH, correlated with enhanced CBZ removal with increasing medium pH in the range of 5-9. A dissolved organic carbon concentration of 5 mg/L resulted in similar to 20% reduction in CBZ removal, probably due to competitive inhibition of the photocatalytic degradation of CBZ. At alkalinity values corresponding to CaCO3 addition at 100 mg/L, an over 40% decrease in CBZ removal was observed. A 35% reduction in CBZ occurred in the presence of surface water compared to complete suppression of the photocatalytic process in wastewater effluent. (c) 2012 Elsevier B.V. All rights reserved.

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