Sensitized photolysis of polychlorobiphenyls in alkaline 2-propanol: dechlorination of Aroclor 1254 in soil samples by solar radiation

Photolysis of benzotriazole and formation of its polymerised photoproducts in aqueous solutions under UV irradiation

“…Therefore, besides being a scavenger of radicals, HA may act as an inner filter to consume most of the photons during the photolysis process to result in a decrease of the rate of photodegradation. [46,47] …”

Photodegradation of Aroclor 1254 Using Simulated Sunlight and Various Sensitizers

“…Sunlight can be a good energy source for the photodegradation of polychlorinated biphenyls (PCBs) in the present of photosensitizers. Because most PCB congeners do not strongly absorb wavelength above 300 nm, sensitizers are used in the transfer of light energy to the PCB molecule (Hawari et al 1992). Many investigations have focussed on the use of high energy, low wavelength (254 -300 nm) radiation for the destruction of PCBs (Bunce et al 1978;Hawari et al 1992;Lepine and Masse 1990;Lepine et al 1991;Ruzo et al 1973).…”

“…Because most PCB congeners do not strongly absorb wavelength above 300 nm, sensitizers are used in the transfer of light energy to the PCB molecule (Hawari et al 1992). Many investigations have focussed on the use of high energy, low wavelength (254 -300 nm) radiation for the destruction of PCBs (Bunce et al 1978;Hawari et al 1992;Lepine and Masse 1990;Lepine et al 1991;Ruzo et al 1973). In the presence of electron donors amines can greatly enhance the overall quantum yields of certain chlorinated aromatic compounds such as hexachlorobenzene (Freeman et al 1986).…”

Kinetic and Mechanistic Study of Photodechlorination of 2,2′,4,4′-Tetrachlorobiphenyl in Surfactant Solutions

“…Stepwise formation of dechlorinated congeners is the main degradation pathway during irradiation of PCBs in alkanes and alcohols (Ruzo et al, 1974a, b;Miao et al, 1996Miao et al, , 1999, but methoxylated PCB derivatives were also identified as one of the photoproducts in alcohols (Crosby and Moilanen, 1973;Ruzo et al, 1974a, b;Nordblom and Miller, 1974;Hawarl et al, 1992). Surfactants are effective in enhancing the solubility of PCBs, thus the presence of surfactant micelles in UV-induced photolysis has been shown to improve photodechlorination of PCBs and minimize side reactions such as hydroxyl substitution (Epling et al, 1988;Chu et al, 1998;Shi et al, 1998).…”