摘要
采用固相法合成层状半导体K4Nb6O17,通过层间离子交换反应、胺插入反应以及硫化反应制备了纳米PbS插层的K4Nb6O17复合光催化剂(记作K4Nb6O17/PbS).利用X射线衍射(XRD),场发射扫描电镜(SEM),X射线荧光光谱仪(XRF),紫外可见漫反射(UV-Vis)和分子荧光光谱(PL)等技术对其进行表征.考察了催化剂在Na2SO3和Na2S为牺牲剂的光催化制氢活性.结果表明,PbS的插层拓展了K4Nb6O17对可见光的响应,催化制氢活性也有明显提高.在紫外光和可见光下3 h产氢量分别达到123.94和0.66 mmol/(g cat).最后讨论了插层复合催化剂光生电荷转移的机理.
The layered compound K4Nb6O17 was prepared via high temperature solid reaction, and PbS intercalated K4Nb6O17 （designated as K4Nb6O17/PbS） photocatalyst was synthesized via direct ion exchange, alkylamines intercalation and sulfurization procedures. The as-prepared samples were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, ultraviolet-visible diffuse reflection spectra （UV-Vis） and photoluminescence measurement （PL）, energy dispersive X-ray detector （EDS） and X-ray fluorescence spectrometer （XRF）. The photocatalytic performance of these catalysts for hydrogen production was also investigated in the presence of Na2S and Na2SO3 sac- rificial reagents. The absorption edge of K4Nb6017 shifted to visible light region after the intercalation of PbS. K4Nb6O17/PbS photocatalysts exhibit higher activities for photocatalytic hydrogen production under both UV light and visible light irradiation, and the amounts of hydrogen produced are 123.94 mmol/（g cat） and 0.66 mmol/（g cat） after 3 h irradiation, respectively. The mechanism of charge separation is also discussed.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第9期933-938,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(50972037
51172063)~~
关键词
铌酸钾
硫化铅
插层
光催化
potassium niobate lead sulfide intercalation photocatalysis
作者简介
崔文权（1977-），男，副教授，博士．E—mml：wkcui@163．com
梁英华，教授．E-mail：Liangyh@yahoo．com．cn
