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摘要
A method for the characterization and quantitative analysis of different ionization forms of phenols in aqueous solution using ultraviolet (UV) full-wavelength scanning was established. By taking advantage of this method, the migration characteristics of different ionization forms of phenols during electrodialysis were elucidated. The results showed that the patterns of characteristic peaks of the dissociated, non-dissociated, and mixed state (mixture of dissociated and non-dissociated) phenols were different in a wavelength range from 220 to 260 nm. The concentrations of the dissociated, non-dissociated, and mixed state phenols were positively linear to their corresponding absorbance at 258, 236, and 236 nm, respectively. The migration characteristics of the dissociated, non-dissociated, and mixed state phenols in the electrodialysis process were accord with electro-migration, synergistic-migration with acid, and ionization equilibrium controlling -migration, respectively. The mobility ratios of the dissociated, non-dissociated, and mixed state phenols in the electrodialysis process were 42%, 4% and 13%, respectively. In a word, the migrations of non-dissociated and mixed state of organic pollutants are also an important research topic in the electrodialysis process.
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