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金红石相含量对混晶纳米TiO2光催化分解水制氢的影响

张 鹏,贾立山,李清彪,方维平,唐 勇   

  1. 厦门大学化学化工学院化学工程与生物工程系;厦门大学化学化工学院化学系
  • 出版日期:2008-09-05 发布日期:2008-09-05

Effect of rutile content on photocatalytic water-splitting for hydrogen production over composite-crystal nano-TiO2

ZHANG Peng,JIA Lishan,LI Qingbiao,FANG Weiping,TANG Yong   

  1. Department of Chemical Engineering and Biochemical Engineering,College of Chemistry and Chemical Engineering,Xiamen University;Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University
  • Online:2008-09-05 Published:2008-09-05

摘要: 合成了不同金红石相含量的纳米TiO2,并研究了其光催化分解水制氢的活性。结果表明,未沉积Pt时,纯锐钛矿TiO2活性最高,金红石相含量的增加导致TiO2活性下降并在下降过程中出现波动。沉积Pt后,TiO2产氢速率随金红石相含量的增加先增后减,在金红石相质量分数为9.7%时达到最高,为40.35 mmol/(gcat·h)。首次提出了金红石相含量对混晶纳米TiO2光催化分解水制氢活性的影响机理。

Abstract: A series of composite-crystal nano-TiO2 powder with various contents of rutile were synthesized by the sol-gel method,and were calcined at various temperatures. The effect of rutile content on photocatalytic water-splitting for hydrogen production over composite-crystal nano-TiO2 was studied in the presence of formaldehyde as sacrificial reagent. The results showed that TiO2 with pure anatase showed the best photocatalytic activity,and increase of rutile content caused a decrease of activity,during which a fluctuation was observed. As Pt was deposited on nano-TiO2 surface by the photo-reduction method,the rates of H2 evolution increased first and then decreased with the increase of rutile content. The maximum value,which reached 40.35 mmol/(gcat·h),was obtained with nano-TiO2 containing 9.7% rutile. A mechanism of the effect of rutile content on photocatalytic water-splitting for hydrogen production over composite-crystal nano-TiO2 was proposed.

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