Sensitized photooxygenation of mononitrophenols in micellar media |
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| Authors: | Marta Luiz Maria I Gutiérrez Graciela Bocco Sonia G Bertolotti Norman A Garcia |
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| Institution: | 1. Departamento de Química, Facultad de Ciencias Naturales , Universidad Nacional de La Patagonia , San Juan Bosco, 9000, Comodoro Rivadavia, Argentina;2. Departamento de Química y Física , Universidad Nacional de Rio Cuarto , 5800, Rio Cuarto, Argentina |
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| Abstract: | The singlet molecular oxygen‐mediated photooxidation of simple nitrophenols was studied in micellar (CTAB) alkaline solutions. A different behaviour for the values of the overall rate constant (Kt ) and the reactive rate constant (Kt ) in the interaction nitrophenol‐singlet molecular oxygen was observed as a function of surfactant concentration. The former decreases as CTAB] increases, from values of 1–3 × 109 M–1 s–1 in the absence of surfactant to values at least one order of magnitude lower at CTAB] ～0.1 M. Parallel, kt remains practically unaffected, in values of the order of 106 — 107 M–l s–1, depending on the particular nitrophenol, within the same CTAB] range. The quantum yield of nitrophenols photooxidation reaches a maximum at CTAB] ～0.1 M. The results are discussed in terms of a combination of causes, the polarity of the nitrophenolic microenvironment being the driving effect. The implication of the results on environmental decontamination are also analyzed. |
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