Fan Ji-Min, Zhao Zhi-Huan, Gong Chao, Xue Yong-Qiang, Yin Shu
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):1675-1681. doi: 10.1166/jnn.2018.14247.
Metal ions (Cr, Ni, Co) doped titania (M-TiO2) coupled with the long after glow phosphor MgAl2O4:(Pr3+, Dy3+) particles were synthesized by the sol-gel method, with the best mass ratio of MgAl2O4:(Pr3+, Dy3+) to M-TiO2 as 4:6. MgAl2O4:(Pr3+, Dy3+)/M-TiO2 had the persistent methyl orange (MO) photocatalytic degradation ability and the photocatalytic degradation went on reacting more than 90 min in dark after turning off the light. MgAl2O4:(Pr3+, Dy3+) emitted the light as a light source in dark which was absorbed by M-TiO2. The differences of MgAl2O4:(Pr3+, Dy3+)/Cr-TiO2, MgAl2O4:(Pr3+, Dy3+)/Ni-TiO2 and MgAl2O4:(Pr3+, Dy3+)/Co-TiO2 might be attributed to the difference in the metal ions doping. The composite MgAl2O4:(Pr3+, Dy3+)/Cr-TiO2 revealed the highest ability of persistent photocatalytic degradation methyl orange. Different metal ions doping made the TiO2 with different band gap.
采用溶胶-凝胶法合成了金属离子（Cr、Ni、Co）掺杂的二氧化钛（M-TiO₂）与长余辉荧光体MgAl₂O₄:（Pr³⁺，Dy³⁺）颗粒的复合材料，MgAl₂O₄:（Pr³⁺，Dy³⁺）与M-TiO₂的最佳质量比为4:6。MgAl₂O₄:（Pr³⁺，Dy³⁺）/M-TiO₂具有持久的甲基橙（MO）光催化降解能力，关灯后在黑暗中光催化降解反应可持续90分钟以上。MgAl₂O₄:（Pr³⁺，Dy³⁺）在黑暗中发光作为光源被M-TiO₂吸收。MgAl₂O₄:（Pr³⁺，Dy³⁺）/Cr-TiO₂、MgAl₂O₄:（Pr³⁺，Dy³⁺）/Ni-TiO₂和MgAl₂O₄:（Pr³⁺，Dy³⁺）/Co-TiO₂之间的差异可能归因于金属离子掺杂的不同。复合材料MgAl₂O₄:（Pr³⁺，Dy³⁺）/Cr-TiO₂表现出最高的持久光催化降解甲基橙的能力。不同的金属离子掺杂使得TiO₂具有不同的带隙。
