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以钛酸丁酯和氧化钐为原料,采用溶胶-凝胶法制备了掺杂TiO2光催化剂,用XRD和TEM等手段对其进行表征,并以活性橙4(RO4)偶氮染料为目标降解物,考察了Sm3+掺杂对TiO2光催化效果的影响.结果表明该催化剂具有较高的光催化降解偶氮染料的活性,随着光照时间的延长,RO4的特征峰489nm和285nm强度逐渐减弱,RO4的偶氮键是最活跃的化学键,它易于被氧化断键.Sm3+掺杂催化剂的催化活性受溶液的pH影响较大,在中性和碱性条件下其光催化活性更强.分析和探讨了Sm3+掺杂TiO2粒子光催化降解能力提高的原因.
TiO 2 photocatalyst was prepared by sol-gel method using butyl titanate and samarium oxide as raw materials. The photocatalysts were characterized by XRD, TEM and other methods. The effects of Sm3 + doping on the photocatalytic activity of TiO2 were investigated. The results showed that the photocatalytic activity of azo dyes was enhanced by Sm3 + doping. As the irradiation time prolonged, the intensity of 489nm and 285nm of RO4 decreased gradually, The azo bond of RO4 is the most active chemical bond, which is easily oxidized and broken. The catalytic activity of Sm3 + doped catalyst is greatly affected by the pH of the solution, and its photocatalytic activity is stronger under neutral and alkaline conditions. The reason why the photocatalytic degradation ability of Sm3 + doped TiO2 particles is improved is discussed.