溶胶-凝胶法制备Pt^(2+)掺杂Bi_2O_3及光催化性能研究  

Photocatalytic Activity of Pt^(2+)-doped Bi_2O_3 Prepared by Sol-gel Method

作　　者：程杰[1] 李建章[1] 钟俊波[1] 曾俊[1] 胡伟[1] 

机构地区：[1]绿色催化四川省高校重点实验室,四川理工学院化学与制药工程学院,四川自贡643000

出　　处：《贵金属》2012年第2期6-9,共4页Precious Metals

基　　金：四川省教育厅基金(No.09ZZ016;No.10ZA140);四川省青年基金(No.09ZQ026-050);四川理工学院博士启动基金(No.2010XJKRL007);绿色催化四川省高校重点实验室开放课题(LZJ02)资助项目

摘　　要：用溶胶-凝胶法制备了Pt2+掺杂的Bi2O3光催化剂(Pt/Bi原子比分别为1/100、2/100、3/100和4/100),以甲基橙为模拟有机污染对催化剂的光催化性能进行了考察。光催化剂用BET、XRD、XPS和紫外-可见漫反射进行了表征,结果表明Pt/Bi原子比为3/100时催化剂的比表面最高;经500℃焙烧后光催化剂晶型为α-Bi2O3;掺杂Pt2+后Bi2O3在可见光区的吸收增强;掺杂Pt2+后Bi 4f7/2和O 1s结合能均向低能端偏移,催化性能测试结果表明Pt/Bi原子比为3/100时的催化剂活性最高。增加的比表面、对可见光响应增强和结合能向低能端偏移均有利于提高Bi2O3光催化活性。Bi2O3 and Pt2＋ -doped Bi2O3 photocatalysts with different molar ratios of Pt/Bi （1/100, 2/ 100, 3/100, 4/100） were prepared by a sol- gel method. The structural properties of the photocatalysts prepared were studied by BET surface area, X - ray diffraction （ XRD）, UV - Vis diffuse reflectance （DRS） and X -ray photoelectron spectroscopic （XPS） techniques. The results show that the Bi203 cata- lyst with 3/100 （Pt/Bi） has the highest BET surface area, and pore volume and the smallest pore size. The XRD patterns of the Pt2＋ -doped Bi2O3 catalysts calcined at 773 K show only the characteristic peaks of a - Bi2O3 phase. The absorbance of Pt2 ＋ - doped Bi2O3 in visible region increases with the increasing of the amount of Pt2 ~. XPS results reveal that the binding energies of Bi 4f7/2 and O ls of Pt2＋ - doped Bi2O3 shift to lower value. Among all of the photocatalysts prepared, the Pt2＋ -doped Bi2O3 catalyst with 3/100 （Pt/Bi） possesses the best photocatalytic activity. The results of further experiments show that the specific surface area, UV - Vis diffuse reflectance and the binding energy all play an important role in promotion of photocatalytic activity of doped Bi2O3 nanostructure.

关 键 词：物理化学 BI2O3 PT 掺杂 光催化 

分 类 号：O643.36[理学—物理化学]