Study Of Preparation And Intercalation Compound And Photocatalytic Hydrogen Of K₂La₂Ti₃O₁₀ Catalysts

Photocatalytic hydrogen evolution from water under solar light irradiation is one ofthe most compitive way to produce the renewable and clean energy. But most ofphotocatalysts exhibited the low utilization for solar energy due to their wide bandgap,which restricts the development of photocatalytic hydrogen production. It’s required toprepare a series of efficient layered perovskite-type compound K₂La₂Ti₃O₁₀photocatalyts via doping and intercalation. Afterwards, the relationship betweenphotocatlytic avtivities and material structure was carried out by means of varioustechniques.The layered K₂La₂Ti₃O₁₀photocatalyst was synthesized via a stearic acid method.The stearic acid method can greatly decrease the preparation time, and improve thephotocatalytic activities due to the high crystallinity. The photocatalytic properties forhydrogen evolution of the photocatalyst were examined under ultraviolet irradiation. Theresults showed that, the sample which synthesized under1000℃for2h possessed awell-crystallized crystal, and exhibited the highest photocatalytic hydrogen productionactivity.CdS-intercalated K₂La₂Ti₃O₁₀photocatalysts were synthesized via the ion-exchangereaction, butylamine pillaring and sulfuration processes, respectively, under theassistance of the microwave irradiation. The structure of the photocatalysts wasdetermined by means of powder X-ray diffraction （XRD）, scanning electron microscope（SEM）, and ultraviolet-visible diffuse reflection spectra （UV-VIS）. The photocatalyticactivities of these composite compounds were also investigated under UV and visiblelight irradiation. The results revealed that the CdS-intercalated K₂La₂Ti₃O₁₀photocatalysts prepared under the assistance of microwave irradiation possess the samecrystal structures with that prepared via a traditional waterlogging method. At the sametime, microwave irradiation can greatly decrease the preparation time, a well-crystallizedcrystal compared and improve the photocatalytic activities. The photocatalytic activitiesof the CdS-intercalated K₂La₂Ti₃O₁₀photocatalyst prepared via a microwave assistedprocess for hydrogen production after3h irradiation were221.53mmol/（g cat） and3.23mmol/（g cat） under UV light and visible light irradiation, respectively.PbS-intercalated K₂La₂Ti₃O₁₀photocatalysts were also synthesized via theassistance of the microwave irradiation. Simultaneously, the crystal structure andphotocatalytic activities of the composite compounds for hydrogen production were alsoinvestigated.The samples had the highest photocatalytic hydrogen production activity of Pb, Agdoped K₂La₂Ti₃O₁₀photocatalysts, when the best doping quantity was Pb:Ti=0.025wereprepared. The photocatalytic activities of the K₂La₂Ti_2.975Pb_0.025O₁₀for hydrogenproduction after3h irradiation were1.13mmol/（g cat） and under visible light irradiation.The photocatalytic activities of CdS-intercalated K₂La₂Ti_2.975Pb_0.025O₁₀were230.15mmol/（g cat） under UV light,3.35mmol/（g cat） under visible light irradiation,respectively.