Photodegradation of some brominated and phenolic micropollutants in raw hospital wastewater with CeO2 and TiO2 nanoparticles | Zendy

Deli̇a Teresa Sponza | Zendy; Gökçe Güney | Zendy

Open Access

Photodegradation of some brominated and phenolic micropollutants in raw hospital wastewater with CeO2 and TiO2 nanoparticles

Author(s) -

Deli̇a Teresa Sponza,

Gökçe Güney

Publication year - 2017

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2017.433

Subject(s) - photodegradation , wastewater , photocatalysis , environmental chemistry , nanoparticle , chemistry , environmental science , waste management , pulp and paper industry , catalysis , materials science , environmental engineering , organic chemistry , nanotechnology , engineering

In this study, the degradations of 2,3,4,5,6-pentabromotoluene (PBT), 2,3,4,5,6-pentabromoethyl benzene (PBEB), triclosan (TCS) and gemfibrozil (GFZ) in raw hospital wastewater were investigated with cerium (IV) oxide and titanium (IV) oxide nanoparticles considering the mechanisms of adsorption, photolysis, and photocatalysis with UV-C lamps. The effects of nano-CeO 2 and nano-TiO 2 concentrations, irradiation times, UV light powers and hospital wastewater pH on the photodegradation yields of micropollutants namely PBT, PBEB, TCS and GFZ were investigated throughout photocatalysis. The nano-TiO 2 produced had an anatase phase with crystalline shape with a surface area of 205 m 2 g -1 and an average size of 11.50 nm. The CeO 2 nanoparticles had a spherical shape with a higher surface area (302 m 2 g -1 ) than that of TiO 2 and a lower average size (8.11 nm). It was found that the removals of PBT, PBEB, TCS and GFZ with adsorption (5.7%-17.1%) and photolysis (9.0%-15.9%) were not significant for both nanoparticles. The photodegradation of PBT (92%), PBEB (90%), TCS (97%) and GFZ (95%) with nano-CeO 2 gave better results than nano-TiO 2 (90%, 87%, 94% and 93% for PBT, PBEB, TCS and GFZ, respectively) under optimum experimental conditions (0.50 g L -1 nano-CeO 2, 45 min irradiation time, 25 °C temperature, pH = 8.50, 210 W UV light power). Both nanoparticles were reused effectively after photo-removals of the micropollutants from the hospital wastewater. The lowest photodegradation yields were 80%, 78%, 75% and 74% for TCS, GFZ, PBT and PBEB, respectively, with nano-TiO 2 after six sequential treatments. The lowest photodegradation yields were 86%, 83%, 80% and 79% for the same micropollutants, respectively, with nano-CeO 2 after six sequential treatments. The cost to treat 1 m 3 raw hospital wastewater were 8.70 € and 2.28 €, for the photocatalytic treatments with nano-TiO 2 and nano-CeO 2 , respectively.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research