Photo-oxidation of phenol and monochlorophenols in oxygen-saturated aqueous solutions by different photosensitizers

Homogeneous and Heterogeneous Free-Based Porphyrins Incorporated to Silica Gel as Fluorescent Materials and Visible Light Catalysts Mimic Monooxygenases

“…Close to these H 2 OEP concentrations, the largest luminescence intensity and sharpness of the relative Soret band was noticed, which ruled out the formation of porphyrin aggregated species, in contrary to the larger amount of catalysts in the silica medium. This is in an agreement with the more general rule that the formation of a dication and dimers or higher order aggregates decreases photoactivity of the photosensitizers (Gerdes et al, 1997;Iliev et al, 2000;Tanielian et al, 2001) as the presence of porphyrin stacking does not allow an optimal interaction of the pinene with macrocycles (Paolesse et al, 2002 However, the results show that the yield of all products increased with an increase in H 2 OEP porphyrin concentration from 0.087 up to 1.3 mg/L (Tab. 1).…”

“…For example, in pure cyclohexane, high yields of cyclohexanone with small amounts of cyclohexanol as a by-product were obtained . The photo-oxidation of phenol and monochlorophenols by irradiation with visible light in aqueous alkaline solution in the presence of 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin and oxygen has been described by Wöchrle and co-workers (Gerdes, et al, 1997). For the visible light-photocatalytic oxidation of hydrocarbons, a bis-iron(III)-l-oxo pacman porphyrin was used (Rosenthal et al, 2006).…”

Photodynamic Action against Wastewater Microorganisms and Chemical Pollutants: An Effective Approach with Low Environmental Impact

“…Each of these methods was shown to have some disadvantages [28]. In this study, in the tested conditions, phenol was photo-degraded once the formation of a new band was observed at~255 nm, corresponding to p-benzoquinones [28,[46][47][48]. According to the literature, benzoquinones have shown to be one of the main photochemical product of phenol [28,46,47] and have shown less toxicity than phenol itself [28].…”

Photosensitized singlet oxygen and its applications

“…More recently, phenols and monochlorophenols in aqueous solution have been investigated by Gerdes et al [59] using photosensitizers such as Al(III), Zn(II), and Ga(III) complexes of 2,9,16,23-tetrasulfophthalocyanine, as well as 5,10,5,20-tetrakis(4-carboxyphenyl)porphyrin, rose bengal, methylene blue, and di(N ,N ,-trimethylammonium-propylene)-3,4,9,10-perylenebiscarboxyimide. The results demonstrated that a monomeric state of the photosensitizer in solution is crucial to its activity in photoreactions.…”