Pt改性的高结晶度TiO_2晶须的光催化性能  

Highly Crystalline TiO_2 Whisker Modified with Pt and Its Photocatalytic Performance

作　　者：丁玉兰[1] 柏扬[1] 李伟[1] 陈闪山[1] 朱育丹[1] 朱银华[1] 杨祝红[1] 陆小华[1] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,江苏南京210009

出　　处：《催化学报》2010年第10期1271-1276,共6页

基　　金：国家自然科学基金重点项目(20736002);国家自然科学基金委员会与香港研究资助局联合科研基金(20731160614);国家自然科学基金(20976080);国家高技术研究发展计划(863计划;2006AA03Z455);江苏省高技术研究项目(BG2007051);江苏省产学研联合创新资金(BY2009107);江苏省普通高校研究生科研创新计划

摘　　要：以二钛酸钾(K2Ti2O5)为前驱体,通过离子交换和800°C焙烧制备了TiO2晶须(TiO2(800°C)),并采用乙二醇胶体法,在TiO2(800°C)样品上负载1%Pt纳米颗粒制成了Pt/TiO2(800°C)催化剂.采用X射线衍射、扫描电镜、透射电镜、X荧光光谱和低温N2吸附-脱附等技术对催化剂进行了表征,并考察了该催化剂光催化降解苯酚活性及稳定性.结果表明,TiO2(800°C)样品为结晶度较高的纯锐钛矿TiO2,载Pt后催化活性提高到原来的2.3倍,具有很高的单位比表面积活性.催化剂经10次重复使用后,Pt流失量仅为6%,活性为新鲜催化剂的91%.而低结晶度的纯锐钛矿或混晶的TiO2负载Pt催化剂的活性和稳定性均不及Pt/TiO2(800°C).Highly thermally stable anatase TiO2 whisker has been synthesized by ion-exchange and calcination at high temperature （800 °C） using K2Ti2O5 as the precursor. Pt nanoparticles （1%） were loaded on this TiO2 to prepare a Pt/TiO2 catalyst by the glycol-colloidal method. The catalyst samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray fluo-rescence, and N2 adsorption-desorption measurements. Photocatalytic performance of the Pt/TiO2 catalyst was measured by phenol degrada-tion. The catalytic activity of Pt/TiO2 was 2.3 times that of TiO2 whisker, and the activity on per unit surface area was high. The Pt/TiO2 cata-lyst was stable after reuse 10 times, and it maintained 91% of its initial activity because the loss of Pt was only 6%.

关 键 词：铂 二氧化钛 晶须 光催化 苯酚 降解 

分 类 号：O643.36[理学—物理化学]