Synthesis Modification And Photocatalytic Properties Of Layered Perovskite Metal Oxide

Photocatalytic hydrogen evolution from water splitting is an advanced techniqueto solve the energy and environmental issues. It receives plenty attentions for thetechnique affects the global economic development. Now the studies mainly focus onthe modification of the semiconductor catalysts to enhance the photocatalytic activity.However, the photocatalytic technique remains in theory and laboratory at this stage.It needs considerable efforts to develop a semiconductor photocatalyst for practicalapplication.Layered perovskite semiconductor catalysts possess unique structure whichreceives great attention in the photocatalytic system. In this work, we prepared thelayer compounds of HLaNb₂O₇and H₂Ta₂Ca₄Nb₄O₂₀by high temperature solid-stateand ion-exchange reaction. Dye （Eosin Y） sensitization and metal elements dopingmethods were used to modify the layered compounds in order to improve thephotocatalytic water splitting activity.The prepared samples were characterized by XRD, SEM, EDS and DRS. Theresults indicated that the sensitization of Eosin Y had enlarged the wavelength fromUV to the visible region.The photocatalytic activity of Pt-loaded samples were evaluated byphotocatalytic hydrogen evolution in the presence of electron donortrithanolamine （TEOA） under visible light （λ﹥400nm）.The results showed abetter photocatalytic activity of the sensitization compound.The photocatalytic activity of layed compounds which doping with foreignmetal elements （Ni and Zn） were evaluated by photocatalytic hydrogenevolution in the presence of electron donor methanol solution under UV light （λ﹤290nm）. According to the experiments, we found the best photocatalyticactivity of the metal-doped compounds.