The Preparation, Intercalation And Photocatalytic Water Cleavage Preoperties Of K₄Nb₆O₁₇

K₄Nb₆O₁₇is a stable semiconductor for phorocatalysis. It can be improved thephotocatalytic activity of K₄Nb₆O₁₇for the decomposition of water into hydrogen underlight irradiation by interlayer intercalation methods. The K₄Nb₆O₁₇powders aresynthesized via a high temperature solid phase reaction, and the optimal synthesiscondition is calcination for2h under1000℃. Grain-like particles can be obtained with arapid temperature rising rate, while rod-like particles are obtained with a slow rate.CdS intercalated K₄Nb₆O₁₇photocatalysts are synthesized under microwaveirradiation, which keeps a higher crystallinity than the same catalyst synthesized viatraditional methods and sharply shortens the intercalation time. The amounts of hydrogenproduced of the CdS intercalated K₄Nb₆O₁₇photocatalysts synthesized with microwaveirradiation under UV light and visible light irradiation are respectively265.95mmol/（g cat）and5.68mmol/（g cat） for3h.The absorption edge of K₄Nb₆O₁₇is shifted to the visible light region after theintercalation of PbS. The amounts of hydrogen produced of the PbS intercalatedK₄Nb₆O₁₇photocatalysts under UV light and visible light irradiation are123.94mmol/（gcat） and0.66mmol/（g cat） for3h, which are both higher than that of K₄Nb₆O₁₇The K₄Nb₆O₁₇powders with different doping contents of Cu2+irons are synthesizedvia a high temperature solid phase reaction. The absorption edge of K₄Nb₆O₁₇was shiftedto the visible light region after the dope of Cu2+irons. When the doping quantity isCu:Nb=0.05（mol quantity）, the catalysts shows the highest activity under visible light andthe amounts of hydrogen produced is3.23mmol/（g cat） for3h. After then the CdSintercalated K₄Nb₆O₁₇doped with Cu2+is prepared, whose photocatalytic activity isimproved further, and the amounts of hydrogen produced under UV light and visible lightirradiation are279.83mmol/（g cat） and7.11mmol/（g cat） for3h respectively.