Sm掺杂TiO2降解苯胺黑药性能

Degradation Activity for Aniline Aerofloat of Sm-doped TiO2 Photocatalysts

采用溶胶–凝胶法在不同煅烧温度下制备了不同Sm掺杂量TiO2 （x%Sm/TiO2）粉末。对制备的x%Sm/TiO2样品进行结构和性能表征,研究了x%Sm/TiO2粉末在紫外灯下对苯胺黑药的光催化降解性能。结果表明：适量Sm掺杂的TiO2比纯TiO2的光吸收强度及比表面积更大,且粒径更小。Sm掺杂TiO2粉末具有高的紫外光催化活性,在300 W汞灯照射下,500℃煅烧的0.25%Sm/TiO2样品催化反应180 min对苯胺黑药的降解率达91.9%,表现出较高催化效率。另外,0.25%Sm/TiO2重复使用4次后,对苯胺黑药的降解率无明显降低,表明Sm掺杂TiO2催化剂具有优良的稳定性。淬灭剂实验表明,催化剂降解苯胺黑药主要是羟基自由基和空穴的协同作用,其中羟基自由基起主要作用。

Different Sm-doped TiO2（x%Sm/TiO2） powders were prepared by a sol-gel method at different calcination temperatures. The structure and physicochemical properties of x%Sm/TiO2 were characterized, and the photodegradation activity of x%Sm/TiO2 for aniline aerofloat was investigated under the irradiation of 300 W mercury lamps. The results indicate that the Sm-doped TiO2 has a greater light absorption intensity, a larger specific surface area and a smaller particle size, compared to pure TiO2. The Sm-doped TiO2 has a high UV photocatalytic activity. Under the light of 300 W mercury lamps, a 0.25%Sm/TiO2 powder calcined at 500 ℃shows the optimum photocatalytic activity, which is reflected by 91.9% removal efficiency to aniline aerofloat after 180 min. In addition, a 0.25%Sm/TiO2 powder still has a great photocatalytic activity for the photodegradation of aniline aerofloat after 4-time recycling, showing the stability of Sm-doped TiO2. The results of quenching experiment indicate that the photocatalytic activity based on the synergistic reaction between holes（h+） and hydroxyl radicals（·OH） while the ·OH acts as the major role.