银和氮共掺杂TiO_2的制备及光催化性能的研究

Preparation and photocatalytic activity of Ag and N doped TiO_2

以钛酸四丁酯为钛源,通过溶胶-凝胶法制得不同掺杂量N和Ag的单掺杂及共掺杂二氧化钛粉体,以甲基橙模拟废水中的有机物,考察了不同掺杂量的催化剂对光催化剂降解能力的影响,并对其机理进行了分析。其中氮掺杂光催化剂n(N)∶n(TiO2)=4∶1,银掺杂催化剂银含量为4%时,光催化性能最高,分别比纯TiO2提高了36%和42%;共掺杂TiO2的摩尔比n(TiO2)∶n(N)∶n(Ag)=1∶4∶0.02,催化性能比单掺杂还要高,在可见光下降解甲基橙300 min的降解率分别为:纯TiO2为40%,N掺杂为75%,Ag掺杂为70%,共掺杂为84%,表明了金属与非金属掺杂的机理在共掺杂光催化剂中共同产生作用。

Single-doped and co-doped TiO2 with various amounts of silver and nitrogen have been prepared by the sol-gel using tetrabutyl titanate,silver and nitrogen as raw materials.The photocatalytic activity to various amounts of catalyst was investigated using methyl orange as the organic in wastewater,and the mechanism of doped was analyzed.The photocatalytic activities were highest when the proportion of N-doped was n（N）∶n（TiO2）=4∶1 and Ag-doped was n（Ag）∶n（TiO2）=0.02∶1.The two degradation rates of single-doped catalysts were more 36% and 42% than pure TiO2 separately.But the photocatalytic activities of co-doped TiO2（molar ratio n（TiO2）∶n（N）∶n（Ag）=1∶4∶0.02） was higher than single-doped.The degradation rates was： pure TiO2,40%;N-doped,75%;Ag-doped,70% and co-doped,84% respectively.It proved that the mechanisms of metal-doped and non-metal-doped affected together in co-doped photocatalyst.