Role of oxygen active species in the photocatalytic degradation of phenol using polymer sensitized TiO2 under visible light irradiation

Journal of Hazardous Materials
Dongdong ZhangXiongfei Huang

Abstract

The role of dissolved oxygen, and of active species generated by photo-induced reactions with oxygen, in the photocatalytic degradation of phenol was investigated using polymer [poly-(fluorene-co-thiophene) with thiophene content of 30%, so-called PFT30] sensitized TiO2 (PFT30/TiO2) under visible light irradiation. The photoluminescent (PL) quantum yield of PFT30/TiO2 was about 30% of that of PFT30/Al(2)O(3), proving that electron transfer took place between the polymer and TiO2. The result that photocatalytic degradation of phenol was almost stopped when the solution was saturated with N(2) proved the importance of O(2). Addition of NaN(3), an effective quencher of singlet oxygen ((1)O(2)), caused about a 40% decrease in the phenol degradation ratio. Addition of alcohols caused about a 60% decrease in the phenol photodegradation ratio, indicating that the hydroxyl radicals (OH), whose presence was confirmed by electron spin resonance (ESR) spectroscopy, was the predominant active species in aqueous solution. In anhydrous solution, singlet oxygen ((1)O(2)) was the predominant species. These results indicate that oxygen plays a very important role in the photocatalytic degradation of phenol.

Citations

May 9, 2014·Journal of Hazardous Materials·Yeoung-Sheng WangJao-Jia Horng
Apr 29, 2011·Journal of Hazardous Materials·Lili ZhangXuexiang Hu
Mar 15, 2016·Environmental Science and Pollution Research International·Sajad RahimiAbbas Rezaee
Apr 15, 2016·Environmental Science and Pollution Research International·Rusul Khaleel IbrahimShaliza Ibrahim
Jul 8, 2017·Beilstein Journal of Nanotechnology·Florian DonatRaphaël Schneider
Jul 28, 2017·Environmental Science and Pollution Research International·Tiecheng WangLingyan Zhu
Aug 5, 2017·Chemical Reviews·Yoshio Nosaka, Atsuko Y Nosaka
Dec 15, 2018··Chandra S. RahendaputriEndah M. M. Putri

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