镍掺杂对二氧化钛光催化性能影响的研究

采用溶胶-凝胶法制备了纳米二氧化钛以及不同掺镍量的TiO₂纳米粒子(原料中Ni∶TiO₂的摩尔分数为1%、3%、5%、7%、9%)。用紫外光照射甲基橙溶液的光催化降解实验研究了掺镍对二氧化钛光催化剂催化效率的影响，试验结果表明,当用n（Ni）∶n（TiO₂）＝5%的Ni(NO₃)₂溶液进行镍掺杂时，制得的TiO₂催化剂光催化效率最高，但与纯TiO₂相比，镍掺杂会减弱TiO₂的光催化效率。X射线衍射分析表明，未掺杂的TiO₂以锐钛矿和金红石两种晶型混合存在，镍掺杂后TiO₂的晶型几乎全为锐钛矿。镍掺杂后会减小TiO₂粒子的尺寸，增大其比表面积。

Influence of nickel doping on behavior of titania photocatalyst

Nanoparticle titania and titania doped with different amount(1%, 3%, 5%, 7%, 9%) of nickel using sol-gel method were prepared. Influences of nickel doping on photocatalytic behavior of titania were investigated for decomposition of methyl orange solution under ultraviolet radiation. The results showed that doping of nickel lowered the photocatalytic efficiency of titania. Titania doped with nickel nitrate solution with n（Ni）∶n（TiO₂）＝5% exhibited the highest photocatalytic efficiency. XRD results showed that pure titania existed in rutile and anatase, but titania doped with nickel existed almost solely in anatase. Doping of nickel reduced size of titania nanoparticle, and increased its surface area.