Fe负载UiO-66协同非均相类Fenton氧化降解废气苯的研究

Study on the synergistic heterogeneous Fenton oxidation degradation of benzene containing waste gas using Fe doped UiO-66

采用水热合成法制备了不同掺杂比例Fe负载UiO-66,并借助XRD、SEM、XPS等分析测试手段对催化剂物理化学特性进行分析,通过自制非均相类Fenton体系装置探究不同Fe负载量、H2O2浓度、空塔速率、反应温度等条件下对废气苯的氧化降解效率影响。结果表明,不同Fe负载量的UiO-66均具有较高的结晶度,呈不规则球状;在非均相类Fenton氧化降解苯实验中,30%的Fe负载UiO-66具有最高的苯脱除效率。EPR结果显示,Fe负载量的增大促进·OH的产生,在一定程度上促进苯的氧化降解。过高的反应温度导致H2O2不稳定,非均相类Fenton氧化降解苯的效率随温度的升高先增大后降低。

The UiO-66 catalysts with different doping ratio of Fe were prepared by hydrothermal synthesis method in this study.The physicochemical properties of the catalysts were characterized by means of XRD,SEM and XPS.The benzene removal efficiency of the catalysts was investigated using a bench-scaled heterogeneous Fenton-like system device.The effects of Fe loading amount,H2O2 concentration,superficial velocity and reaction temperature on benzene removal efficiency were studied.The results showed that the Fe doped UiO-66 was irregularly spherical and of high crystallinity.The highest benzene removal efficiency was obtained at 93%over the catalyst with 30%Fe loading.The EPR results proved that increasing Fe loading on UiO-66 evidently promoted the production of·OH radicals,which promoted the degradation of benzene to a certain extent.The benzene removal efficiency decreased with the rise of temperature at higher range because H2O2 was unstable at high temperature.