PVDF／Fe^(3+)催化膜催化H_2O_2降解染料橙黄Ⅳ

Degradation of OrangeⅣdey solution catalyzed by PVDF/Fe^(3+)resin in the presence of H_2O_2

采用浸没沉淀相转移法制备了PVDF/Fe^(3+)催化膜。以橙黄Ⅳ为研究对象,探索了H_2O_2浓度、pH、温度、橙黄Ⅳ浓度、催化剂量等因素对催化反应速率的影响。结果表明,H_2O_2的初始浓度越高,反应速率越快,反应遵循一级反应动力学,反应速率常数与H_2O_2浓度具有良好的相关性。在pH值3.1～5.2的范围内,催化剂能有效地降解橙黄Ⅳ。随着温度升高,反应速率加快,反应的活化能为38.86 kJ·mol^(-1)。随着橙黄Ⅳ的初始浓度的增加,脱色率有所下降,但总体影响不大。随着催化剂投量的增加,橙黄Ⅳ的脱色率明显提高。反应中的活性物种是羟基自由基和高价态铁共存。

A new heterogeneous Fenton PVDF/Fe3＋ catalysts membrane was prepared by immersion precipitation phase-transfer method. The effect of the initial concentration of Hydrogen peroxide （H2O2） , the initial pH, the initial OrangeⅣconcentration, the reaction temperature and catalyst dosage on the reaction rate was studied. The concentration of H2O2 is higher, the reaction rate is faster. This reaction follows psendo-first-order kinetics; the reaction rate has a good linear relationship with the concentration of H2O2. The PVDF/Fe3＋ catalyst membrane can effectively decolorize OrangeⅣin the pH range of 3.1 -5.2. The reaction rate increase with increasing of temperature,the activation energy for the 38.86 kJ·mol-1. The decolorization rate of OrangeⅣdecreased with increasing of initial concentration of OrangeⅣ. The decolorization rate of OrangeⅣincrease with increasing of dosage of catalyst. The reactive intermediates for this reaction were both OH·and ferryl species.