Synthesis Of Intercalated Montmorillonite And Its Photocatalytic Performance In The Decolorization Of C.I. Reactive Blue19

As one kind of AOPs, traditional homogeneous photo Fenton reaction produces ironsludge which will cause secondary pollution, meanwhile its reactivity depends greatly onacidic conditions. On the other hand, traditional photo Fenton reagents show low rate ofutilization of sunlight, so practical application of photo Fenton is limited.In this paper, photo Fenton reagents were loaded onto montmorillonite by ion exchangemethod to improved its photocatalytic performance. Ce doping hydroxyl Fe/Al andFe-glutamate chelate were used as intercalating agent to prepare the catalyst. X-ray diffractionanalysis, X-ray fluorescence spectroscopy, nitrogen adsorption-desorption analysis,UV-visible diffuse reflectance analysis were used as characterization techniques for analyzingthe physical and chemical structure of the catalysts, providing knowledge for thephotocatalytic theory. Using reactive brilliant blue as the target pollutants, experiments werecarried out to test the photocatalytic properties of the catalysts under different experimentalconditions.Major conclusion was obtained as follows:In this study, different Ce doping hydroxyl Fe/Al montmorillonite, iron intercalatedmontmorillonite and Fe-glutamate intercalated montmorillonite were prepared and used ascatalyst. The increase of basal spacing and BET surface area of Ce doping hydroxyl Fe/Alintercalated montmorillonite indicates the successful intercalation of reagents into theinterlayer of montmorillonite. Photocatalytic experiment results indicate that thephotocatalytic performance of Ce doping hydroxyl Fe/Al intercalated montmorillonite can beimproved by the Ce doping, but too much Ce content can not further improve the catalyticefficiency, optimal Ce doping content in this experiment was found to be1.0%.The basal spacing of Fe-glutamate intercalated montmorillonite increases from1.54nm of theparent clay to1.93nm, while in Fe-intercalated montmorillonite was1.56nm, both XRF andXPS full spectrum scanning results observed significant increase of Fe content inFe-glutamate intercalated montmorillonite compared to both montmorillonite andFe-intercalated montmorillonite. This suggests that montmorillonite has higher affinity andlarger adsorption capacity for Fe-glutamate complex than hydrated iron ion. FTIR and XPSresults show that the chemical form of N which locates in the edge of the chelate ring changesafter intercalation, while the Fe at the center of the ring is unaffected due to the protectiveeffect of chelating ring. The photocatalytic experiments show that the degaradation of RB19in dark Fenton reaction by Fe-glutamate intercalated montmorillonite was quite limited, while the degradation efficiency was greatly improved under the irradiation of sunlight, andFe-glutamate intercalated montmorillonite shows better photocatalytic performance comparedto Fe-intercalated montmorillonite. Furthermore, Fe-glutamate intercalated montmorillonite isable to work at neutral conditions with good catalytic efficiency.