Fenton氧化反应过程中存在铁系络合物的初步分析

在无需进行物质分离的条件下,利用紫外–可见分光光度计分别测定Fe2+、Fe3+、H2O2各自不同浓度下的吸光度,以及三者混合后不同波长下的全扫描吸收强度,研究Fenton氧化反应过程中络合物形成的规律.实验结果表明:在排除降解底物影响的情况下,Fenton氧化反应过程中产生了一种铁系络合物,在所考察的整个波段(190~500 nm)内呈现出较大的吸光度,从而验证了Fenton氧化反应过程中络合物的存在,其浓度是随着双氧水的浓度而变化,为阐明Fenton氧化反应过程中羟基自由基产生的机理提供了有力的基础数据.

Analysis of Iron-based Complex in Fenton Oxidation Process

Absorbance of different concentrations of Fe2＋,Fe3＋ and H2O2 was investigated individually by using UV-Visible spectrophotometer without separating the substances in the solution. With the changes of UV-Vis spectra of the mixture of these three substances throughout the whole reaction,the law of complex formation was studied. The result shows that iron-based complex is found without substrate in Fenton reaction,which has great absorbance across the entire band（190-500,nm）examined. Thus the existence of complex in Fenton oxidation process is verified. Its concentration varies with the change of concentration of hydrogen peroxide.This research has provided a strong foundation for further studiesof the reaction mechanism of hydroxyl radical in Fenton oxidation process.