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Both flavin derivatives were successfully synthesized and characterized by NMR (nuclear magnetic resonance) and mass spectrometry. A slightly modified method for 10-ethyl flavin was developed. Both HPLC (high performance liquid chromatography) and GC-MS data suggested that all phenols were degraded in the presence of either flavin at micromolar concentrations under direct sun light. A rapid breakdown of the phenols with 35-80% degradation over the course of 2 h was observed. The degradation efficiency was clearly dependent on the phenol type. The rank order for the degradation efficiency over 2 h was 4-chlorophenol and 4-methoxyphenol (~80%) > phenoxyacetic acids (60-65%) > nitrophenol and phenol (~35%).

Photochemical Degradation of Phenols in Water Using Flavin-Based Photosensitizers