金属离子掺杂对TiO_2光催化性能影响分析

Effect of Metal Ion Adulterant on the Photocatalytic Degradation Properties of TiO_2 Photocatalyst

TiO2光催化剂可有效去除水中有机污染物。本文采用溶胶-凝胶法(Sol-gel)制备了掺杂不同含量金属离子的复合型TiO2光催化剂,光催化降解甲基橙溶液实验结果表明:掺杂Cr3+的TiO2光催化活性明显高于单一TiO2和其他几种掺杂催化剂的光催化活性;当Cr3+的掺入比例约为1.0%时,其光催化活性最高,紫外光照4h甲基橙的降解率达到90%以上,可见光照射6h甲基橙的降解率达85%以上。可望将掺杂金属离子的纳米TiO2作为一种有效的光催化剂,广泛应用于被污染水体的净化处理。

TiO_ 2 photocatalyst can degrade organic pollutant in waste water efficiently. Metal ion-doped TiO_ 2 nanoparticles are prepared with different doping amount by sol-gel method. The prepared sample are evaluated by the photo-catalytic oxidation degradation experiment of methyl orange. The experiment results indicate that the photo-catalytic activities of Cr^(3+)-doped TiO_ 2 are photoactive than bare TiO_ 2, and that in the Cr^(3+)-doped TiO_ 2 system, 1.0% is optimal amount of doping. Furthermore, it is studied that the degradation rate of methyl orange can reach 92% in UV light of 4 hours and 85% in visible light of 6 hours.It can be expected that M^(n+)- TiO_ 2 photocatalyst is widely applied to the degradation of organic pollutant in waste water treatment.