Mestánková H, Mailhot G, Krýsa J, Jirkovský J, Bolte M
Laboratoire de Photochimie, UMR 6505 CNRS, Université Blaise Pascal, 63177 Aubière Cedex, France.
Water Sci Technol. 2004;49(4):165-70.
Kinetics of the oxidative photodegradation of monuron (3-(4-chlorophenyl)-1-1-dimethylurea) in both homogeneous solution of Fe(ClO4)3 and heterogeneous suspension of TiO2, were investigated and compared. In the homogeneous system (Fe(II)), the speciation of Fe(III) aquacomplexes was shown to play an essential role in the rate of photodegradation. For high concentrations of TiO2 (> 500 mg L(-1)), the photodegradation rate was similar to the reaction rate obtained with a freshly prepared solution of Fe(II) (3 x 10(-4) mol L(-1)). In the combined system (TiO2 + Fe(III)), a synergy effect accelerating the monuron photodegradation was observed. Actually, in the presence of Fe(III) (in concentration compatible with a safe environment), a similar reaction rate for monuron photodegradation was obtained with a TiO2 concentration lower by a factor of 20.
研究并比较了灭草隆（3-(4-氯苯基)-1,1-二甲基脲）在Fe(ClO₄)₃均相溶液和TiO₂非均相悬浮液中的氧化光降解动力学。在均相体系（Fe(II)）中，Fe(III)水络合物的形态被证明在光降解速率中起重要作用。对于高浓度的TiO₂（> 500 mg L⁻¹），光降解速率与用新制备的Fe(II)溶液（3×10⁻⁴ mol L⁻¹）获得的反应速率相似。在组合体系（TiO₂ + Fe(III)）中，观察到加速灭草隆光降解的协同效应。实际上，在存在Fe(III)（浓度与安全环境相容）的情况下，TiO₂浓度降低20倍时仍可获得相似的灭草隆光降解反应速率。
