镍铋复合氧化物的制备及其光催化活性

用室温固相反应法分别合成了镍氧化物、铋氧化物和镍铋多种配比复合氧化物．通过红外光谱对其结构进 行了初步分析,并以甲基橙为光催化降解反应模型化合物考查了光催化剂的活性,研究了不同摩尔比、光照时间、 催化剂用量和老化时间对其光催化降解甲基橙的影响．结果表明:对于甲基橙的降解,制得的最佳摩尔比[n(Ni): n(Bi)=1:3]复合氧化物1 h降解率达到68．5％．老化可以提高催化剂的光催化效果．

Preparation and Photocatalytic Reactivity of Ni-Bi Mixed Oxide

The NiO, Bi2O3and Ni-Bi mixed oxides are prepared by solid state reaction method. Their structures are analyzed by FT-IR. Using methyl orange as the model compound of the photocatalytic degradation reaction, the activities of the prepared photocatalysts are investigated in suspension irradiated by a high-pressure mercury lamp. The effects of different molar ratio , illumination time. aging time and dosage of photocatalysts on the efficiency of photodegradation of methyl orange are investigated. The results reveal that 68. 5% of methyl orange can be degraded by Ni-Bi mixed oxide[n(Ni) : n(Bi) = 1 : 3, molar ratio] after illumination for 1 h. The aged photocatalyst shows a higher photocatalytic activity.