MULTIVARIATE ANALYSIS FOR PHOTODEGRADATION OF PROPRANOLOL IN UV-VIS/ENHANCED FENTON SYSTEM AT CIRCUMNEUTRAL pH

作者：Liu, Zizheng; Wang, Zongping; Chen, Yong; Luo, Bo; Xue, Miaomiao; Tao, Tao

来源：Fresenius Environmental Bulletin, 2014, 23(9): 2059-2067.

• Propranolol
• Fenton-like system
• central composite design
• circumneutral pH

The photochemical removal of propranolol was systematically investigated in Fe(111)-citrate/H2O2 system at circumneutral pH by multivariate-parameter optimization. A central composite design was employed to explore the effects of the initial concentrations of Fe(III) (0-40 mu M), citrate (0-400 mu M), H2O2 (0-600 mu M), and pH (5.0-9.0) on the photodegradation of propranolol in aqueous solution. Five levels of each factor were included in the design. The photodegradation of propranolol was strongly dependent on the ratios of Fe(III)-to-cit and concentration of H2O2. The optimal condition was achieved at pH 5.2 with [Fe(III)](0)/[cit](0)/[H2O2](0) ratio of 36.5/358/662 (mu M). The (OH)-O-center dot formation mechanism was investigated according to the multivariate photodegradation kinetics and speciation distribution analysis of Fe(III) species. FeOHcit(-) is the predominant species as the source of Fe(11) in the Fe(III)-citrate/H2O2 system at high pH. (OH)-O-center dot was verified to be the main reactive oxygen species responsible for the photodegradation of propranolol. The iron (Fe2+/Fe3+) in the Fenton-like system was first reused by the addition of citrate and H2O2 to the reaction solution. After five runs of cycling, the system still exhibited excellent photoreactivity. The results indicate that Fe(III)-citrate/H2O2 was highly efficient for the elimination of propranolol at near neutral pH under simulated sunlight.

• 出版日期2014
• 单位华中科技大学