Efficient Visible Light Induced Degradation of the Brightener Tinopal CBS-X. Accelerated Bacterial Adsorption Observed after Photocatalytic Pretreatment
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Cesar O. Pulgarin
Abstract
The experimental results for the photocatalytic degradation of Tinopal CBS-X Disodium 4,4′-bis(2-sulfostyryl) biphenyl has been studied via the Fenton reaction. In a typical run, irradiation of a solution containing Tinopal CBS-X (5 10-4M), Fe+3 (1.6 103 M) and H2O2 (10-2 M) showed 90% degradation in 2 hr and complete degradation in about 4 hr. The influence on the photodegradation process of the substrate concentration, Fe+3 ions, the contribution of the dark reaction and the presence of H2O2 has been systematically studied. During photodegradation dearomatization takes less than 1 hr and a slower degradation of aliphatic groups was subsequently observed by nuclear magnetic resonance (NMR). In all cases the fluorescence intensity decreased as the Fenton reaction proceeded, but the shape of the spectra did not change indicating that the degradation products were not fluorescent. The emission lifetime of Tinopal CBS-X was measured by monophoton quantum techniques to be around 1.1 ns. The observed fluorescence had a yield of unity. The initial kinetics observed for intermolecular bond scission between the aromatic rings was found to be much slower than the intramolecular bond scission taking place in the aromatic ring itself during the degradation process. By means of a biological test it was found that for pretreated solutions the adsorption of Tinopal CBS-X proceeds much faster than when unpretreated substrate is used on activated sludge.
© 2017 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Titelei
- Inhalt
- Editorial
- Editorial policy
- Feature Articles
- Figures-of-Merit for the Technical Development and Application of Advanced Oxidation Processes
- The Use of Iron in Advanced Oxidation Processes
- Research Articles
- Photodegradation of Surfactants XVII Photo-oxidation Processes in Amphoteric Surfactants Catalyzed by Irradiated TiO2 Suspensions
- Mechanisms of Photocatalysis: The Reductive Degradation of Tetrachloromethane in Aqueous Titanium Dioxide Suspensions
- Generation Efficiency of the Hydroxyl Radical Adduct of the DMPO Spin Trap in Homogeneous and Heterogeneous Media
- The GC-MS Analysis of Organic Intermediates from the TiO2 Photocatalytic Treatment of Water Contaminated by Lindane (1α,2α,3/3,4α,5α,6β- hexachlorocyclohexane)+
- Investigation and Properties of the Discharge in Dielectric Barrier Reactors Decomposition of Toluene, o-Xylene, Trichloroethylene, and Their Mixture Using a BaTiO3 Packed-Bed Plasma Reactor
- Decomposition of Toluene, o-Xylene, Trichloroethylene, and Their Mixture Using a BaTiO3 Packed-Bed Plasma Reactor
- Plasma Assisted Oxidation of Propene
- Efficient Visible Light Induced Degradation of the Brightener Tinopal CBS-X. Accelerated Bacterial Adsorption Observed after Photocatalytic Pretreatment
- Abiotic Oxidative Degradation of Atrazine on Zero-Valent Iron Activated by Visible Light
