泡沫镍负载Pr-N共掺杂TiO_2的制备及其光催化性能  

Preparation of Pr-N co-doped TiO_2 immobilized on nickel foam substrates and its photocatalytic property

作　　者：沙爽[1] 周少奇[1,2,3] 赵晶晶[1] 张小娜[1] 周晓[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510641 [3]广东省教育厅环境保护与生态修复重点实验室,广州510006

出　　处：《环境工程学报》2012年第8期2495-2500,共6页Chinese Journal of Environmental Engineering

基　　金："十一五"国家科技支撑项目(2008BAE64B05);广州市重大科技项目(2008DLB2080500);广东省粤港关键领域重点突破项目(2007A032500005)

摘　　要：以泡沫镍为载体,钛酸丁酯为原料,采用溶胶-凝胶法制备Pr-N共掺杂TiO2光催化剂。利用X射线衍射(XRD)、紫外-可见漫反射光谱(DRS)、扫描电镜(SEM)对催化剂进行表征,结果表明,Pr和N的掺杂抑制了TiO2从锐钛矿晶型向金红石晶型的转变,提高了催化剂在可见光区的吸收能力。以孔雀石绿为目标模型化合物,利用正交实验得出当n(Pr)∶n(N)∶n(Ti)为0.0020∶0.2∶1、焙烧温度为400℃时制得的催化剂活性最高。同时,考察了Pr-N共掺杂、Pr掺杂、N掺杂及TiO2对孔雀石绿降解并利用傅立叶红外光谱对降解产物进行分析,实验表明,Pr-N共掺杂之后催化剂对孔雀石绿的降解率较改性之前提高了1.6倍。Pr-N co-doped TiO2 photocatalyst was prepared by a sol-gel method with tetrabutyl titanate, which was immobilized on nickel foam substrates. The photocatalyst was characterized by X-ray diffraction （XRD） , UV-Vis diffuse reflectance spectroscopy （DRS） and scanning electron microscope （SEM）. It shows that the doping of Pr and N prevent the transition of crystal phase from anatase to rutile , and an enhancement of the absorption in the visible light region. An orthogonal experiment was designed. The result shows that the opti- mal parameters of photocatalyst are n（Pr） ： n（N） ： n（Ti） = 0. 0020： 0.2： 1, calcined at 400~C. The degradation of malachite green was investigated as a model reaction, the degradation products were analyzed by FTIR. The photocatalytic activity of pure TiO2 , N-doped TiO2, Pr-doped TiO2 and Pr-N co-doped TiO2 was studyed , the degradation of malachite green with Pr-N co-doped TiO2 was l. 6 times higher than pure TiO2.

关 键 词：光催化 Pr-N共掺杂 孔雀石绿 正交实验 

分 类 号：X52[环境科学与工程—环境工程]