Photodebromination of Opaque Slurries Using Titania-Coated Mercury Electrodeless Discharge Lamps.

0461703 - ÚCHP 2017 RIV DE eng J - Journal Article
Kaštánek, František - Církva, Vladimír - Kmentová, Hana - Kaštánek, P. - Šolcová, Olga
Photodebromination of Opaque Slurries Using Titania-Coated Mercury Electrodeless Discharge Lamps.
Journal of Multidisciplinary Engineering Science and Technology. Roč. 3, č. 7 (2016), s. 5262-5267. ISSN 2458-9403. E-ISSN 3159-0040
R&D Projects: GA TA ČR TA04020700
Institutional support: RVO:67985858
Keywords : photocatalysis * electrodeless discharge lamp * polybrominated diphenyl ethers
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

Degradation of decabromodiphenyl ether (BDE209) dissolved in n-hexane and in the mixture of n-hexane with water and microglass beads using microwave assisted photoreaction was examined. A novel electrodeless discharge lamp coated with titania oxide (anatase) and placed in a microwave field directly in a bulk of suspension was used to generate UV/Vis radiation. This method enhances penetration of UV/Vis light. Positive microwave effects (probably only heat effects) compensate relatively low irradiance intensity of UV/Vis generated in a microwave field.
The rate of BDE209 congener debromination was high and reaction efficiency after 240 minutes of BDE209 dehalogenation exceeded 99% even with high concentrations of 10 000 ng/mL. Similarly, the pathway of PBDE photodebromination by successive losses of bromine atoms was confirmed as the main initial pathway, in some cases also influenced by PBDE substitution patterns. Lower brominated congeners, including BDE28, were determined.
Permanent Link: http://hdl.handle.net/11104/0261287