Abstract
Abstract
Background
Photodegradation of trichloroethylene (TCE) in aqueous solution under simulated solar light irradiation was studied under different experimental conditions to determine the reaction mechanism and kinetics that control TCE degradation using bismuth oxybromide (BiOBr) in the presence of sulfite. Photocatalysts were synthesized to be more responsive to visible light under simulated solar light and particular attention was focused on the reactive specie formed by reaction of the sulfite on the surface of BiOBr under simulated sunlight.
Result
Degradation rate of TCE was greatly enhanced by the presence of sulfite, and the enhancement increased with sulfite dose to a maximum that was retained at higher sulfite doses. Degradation rate of TCE was also affected by other factors, such as initial TCE concentration, BiOBr dose, and solution pH. In addition, the cycling performance of BiOBr was examined, and the amount of TCE degraded was almost constant over increasing cycle numbers when initial sulfite concentration was high enough to maintain a suitable sulfite concentration throughout the experiment. When TCE was degraded by BiOBr in the presence of sulfite under simulated sunlight irradiation, the major by-product measured was the non-hazardous chloride ion, and dechlorination efficiency was about 58%.
Conclusion
This study extended the use of a potential effective photocatalyst (BiOBr) to a semi-volatile organic contaminant (TCE), not limited to mainly focus on organic dyes, and evaluated the use of sulfite as a hole scavenger in order to enhance the degradation of TCE without needing to manipulate the structure of BiOBr. The active species being responsible for TCE degradation in BiOBr/TCE/sulfite system under simulated solar light was the sulfite radical (SO3·−), and the photocatalytic activity of BiOBr did not decrease over a number of treatment cycles when SIV dose was sufficient.
Funder
Qatar National Research Fund
Publisher
Springer Science and Business Media LLC
Reference51 articles.
1. USEPA (2017) Risk management for trichloroethylene (TCE). In: Assessing and managing chemicals under TSCA. United States Environmental Protection Agency. https://www.epa.gov/assessing-and-managing-chemicals-under-tsca/risk-management-trichloroethylene-tce. Accessed 2019
2. Fan J, Yates JT (1996) Mechanism of photo-oxidation of trichloroethylene on TiO2: detection of intermediates by infrared spectroscopy. J Am Chem Soc 118:4686–4692
3. Yamazaki-Nishida S, Cervera-March S, Nagano KJ, Anderson MA, Hori K (1995) Experimental and theoretical study of the reaction mechanism of the photoassisted catalytic degradation of trichloroethylene in the gas phase. J Phys Chem 99:15814–15821
4. USEPA (1997) Use of monitored natural attenuation at superfund, RCRA corrective action, and underground storage tank sites. Directive No. 9200.4-17P. Office of Solid Waste and Emergency Response. Washington DC, USA
5. Russel HH, Matthews JE, Sewell GW (1992) Groundwater issue: TCE removal from contaminated soil and groundwater. No: EPA/540/S-92/002. Washington DC, USA
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