离子液体辅助合成Nd掺杂TiO_2的可见光催化性能

在离子液体1-丁基-3-甲基咪唑四氟化硼(C4MIM]BF4)的辅助下,采用溶胶-凝胶法制备了Nd掺杂Ti O2光催化剂(Nd-Ti O2(IL))。实验结果表明:在加入C4MIM]BF4、n(Nd)∶n(Ti O2)=2.5%的条件下制得的Nd-Ti O2(IL)(记作2.5%Nd-Ti O2(IL))的光催化性能最好;在初始亚甲基蓝质量浓度10 mg/L、2.5%Nd-Ti O2(IL)加入量1 g/L的条件下,光催化反应180 min,亚甲基蓝降解率为84%,2.5%Nd-Ti O2(IL)光催化降解亚甲基蓝的表观速率常数为0.010 9 min-1。表征结果显示:Nd的掺杂抑制了Ti O2晶粒长大,增大了Ti O2的比表面积,2.5%Nd-Ti O2(IL)的比表面积为80.77 m2/g;C4MIM]BF4的加入提高了Ti O2的晶化度;Nd以Nd3+的形式,通过晶格取代方式进入Ti O2晶格。

Visible-Light Photocatalytic Activity of Nd-Doped TiO2 Synthesized with Ionic-Liquid Assistance

The Nd doped TiO₂ photocatalyst （Nd-TiO₂（IL）） was prepared by sol-gel method with assistance of ionic liquid C₄MIM]BF₄. The experimental results show that： The photocatalyst prepared under the conditions of C₄MIM]BF₄ addition and n（Nd）∶n（TiO₂）=2.5% （2.5%Nd-TiO₂（IL）） has the highest photocatalytic activity;When the initial mass concentration of methylene blue is 10 mg/L,the 2.5%Nd-TiO₂（IL） dosage is 1 g/L and the reaction time is 180 min,the degradation rate of methylene blue is 84%,the apparent rate constant on 2.5%Nd-TiO₂（IL） is 0.010 9 min^-1. The characterization results show that： The doped Nd inhibits the growth of TiO₂ nanoparticles and increases the surface area of TiO₂,the surface area of IL-2.5%Nd/TiO₂ is 80.77 m²/g;The crystallinity of TiO₂ is increased with the addition of C₄MIM]BF₄;Nd³⁺ enters into the TiO₂ lattice by lattice substitution.