纳米ZrO_2/ZnO制备及光催化降解亚甲基蓝的研究

Preparation and photocatalytic degradation of methylene blue by nano-sized ZrO_2/ZnO

以氯氧化锆和醋酸锌为反应物,采用化学沉淀法制备纳米Zr O2/Zn O光催化剂,利用XRD、SEM、EDS等对催化剂粉体进行表征;同时研究了催化剂焙烧温度、Zr添加量、催化剂用量等因素及光源对亚甲基蓝(MB)降解效果的影响。结果表明,当催化剂焙烧温度为400℃、Zr添加量为4.0%(摩尔分数)、催化剂用量为1.0 g/L时,降解效果达到最佳;对比试验表明,纳米Zr O2/Zn O光催化剂不仅适用于紫外光,还适用于太阳光。在太阳光下,当反应时间适宜时,同样能达到与紫外光相同的降解效果。

Nano-sized ZrO2/ZnO was prepared by chemical precipitation method using zirconium chloride and zinc acetate as reactants. The obtained powders were characterized by XRD, SEM and EDS. Moreover, the effects of roasting temperature, addition amount of Zr, dosage of catalyst and light source on photocatalytic degradation of methylene blue （MB） solution were studied. The results showed that roasting temperature was 400 ℃, mole fraction of Zr was 4.0%, the optimum dosage of catalyst was 1.0 g/L. The contrast test showed that the nano-sized ZrO2/ZnO was not only applicable to UV light, but also to the solar light. Under the sunlight, when the reaction time was suitable, it could also achieve the same degradation effect as the ultraviolet light.