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研究了在紫外光(UV)照射下,Fe(Ⅲ)-富马酸盐体系对p-硝基苯酚(PNP)的光降解反应,考察了溶液pH、Fe(Ⅲ)、富马酸盐和PNP的初始浓度对PNP降解率的影响。结果表明,UV/Fe(Ⅲ)-富马酸盐体系对PNP有光降解作用,相比于只含Fe(Ⅲ)或者富马酸盐体系,同时加入Fe(Ⅲ)与富马酸盐构成的体系在降解PNP方面有协同作用。在pH 3.0~6.0范围内,PNP的降解率随着pH和PNP初始浓度的增大而降低,而随着Fe(Ⅲ)和富马酸盐的初始浓度的增大而增大。氯仿猝灭法证实,该体系在降解PNP反应过程中产生了超氧负离子自由基;采用荧光法和异丙醇猝灭法证实了该体系在反应过程中产生了羟基自由基,同时证实了羟基自由基为PNP光降解反应的主要反应物质。
The photodegradation of p-nitrophenol (PNP) by Fe (Ⅲ) -fumarate system under UV irradiation was studied. The effects of pH, Fe (Ⅲ) Effect of Initial PNP Concentration on PNP Degradation Rate. The results showed that UV / Fe (Ⅲ) - fumarate system had a photodegradation effect on PNP. Compared with Fe (Ⅲ) or fumarate system alone, Fe (Ⅲ) and fumarate The system has a synergistic effect in the degradation of PNP. The degradation rate of PNP decreases with the increase of initial pH and PNP concentration in the range of pH 3.0-6.0, and increases with the initial concentration of Fe (Ⅲ) and fumarate. The results of chloroform quenching showed that the system produced superoxide anion radical in the process of PNP degradation. Fluorescence and isopropanol quenching method confirmed that the system produced hydroxyl radical during the reaction. At the same time, hydroxyl radical Free radicals are the main reactants for photodegradation of PNP.