FeVO4-H2O2体系中酸性品红的降解性能研究

为提高印染废水的高效、快速降解,进行了FeVO₄催化降解酸性品红水溶液的研究,考察了双氧水的初始浓度、催化剂用量和反应温度对脱色率和反应速率常数的影响。结果表明:在使用FeVO₄作为非均相Fenton催化剂时,酸性品红的氧化降解反应可以使用假一级反应动力学模型进行描述。FeVO₄投加量的增加和温度的增大都可以显著提高酸性品红降解反应速率常数。在H₂O₂浓度为13.6 mmol·L^-1,FeVO₄投加量为1.0 g·L^-1,温度25 ℃条件下,60 min时FeVO₄对酸性品红水溶液的降解率达到94.5%。同时,根据不同温度下的反应速率常数,并结合Arrhenius方程计算出酸性品红降解过程的假一级反应的活化能Ea为60.24 kJ·mol^–1。为利用多相类Fenton催化剂方法处理含酸性品红的印染废水提供理论依据。

Catalytic Degradation Treatment of Acid Magenta in Aqueous Solution by FeVO4-H2O2

In order to improve the efficienct degradation of printing and dyeing wastewater, the catalytic degradation of acid magenta in aqueous solution containing FeVO₄ was studied, and the influence of various factors, such as H₂O₂ concentration, catalyst dosage and reaction temperature on the treatment of acid magenta were investigated. The results indicate that the degradation of acid magenta can be described by using pseudo-first-order reaction kinetic model when FeVO₄ is used as heterogeneous Fenton-like catalyst. The reaction rate constants of acid magenta are improved by increasing both the catalyst dosage and the reaction temperature. The results show that the degradation rate of acid magenta is 94.5% after 60 min under the experimental conditions of H₂O₂]₀ = 13.6 mmol·L^-1 and FeVO₄]₀ = 1.0 g·L^-1 at room temperature (25 ℃). Based on the Arrhenius equation, the activation energy (Ea, 60.24 kJ·mol^–1) for the pseudo-first-order reaction is calculated according to reaction rate constants at different temperatures. This paper provides a theoretical basis for treating printing and dyeing wastewater containing acidic magenta with heterogeneous Fenton-like catalyst.