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.
出处
《环境工程学报》
CAS
CSCD
北大核心
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)
关键词
光催化
Pr-N共掺杂
孔雀石绿
正交实验
photocatalysis
Pr-N co-doped
malachite green
orthogonal experiment
