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采用共沉淀法制备了一系列Zn–Ni–Al三元类水滑石,然后焙烧制得衍生物—Zn–Ni–Al复合氧化物,并用X射线衍射、热重–差热分析、扫描电子显微镜、比表面积分析及元素分析等对样品进行了表征,考察了类水滑石Zn/Ni/Al金属原子比、焙烧温度等因素对甲基橙、亚甲基蓝、罗丹明B的光催化降解的影响。结果表明:类水滑石前驱体Zn/Ni/Al的摩尔比为1:1:1,焙烧温度为450℃时,复合氧化物的催化效果最好。此条件下制得的Zn–Ni–Al复合氧化物在300W紫外光照60min后,对甲基橙、亚甲基蓝的降解率可达到97%以上,光照100min内对罗丹明的降解率可达到91%。
A series of Zn-Ni-Al ternary hydrotalcites were prepared by co-precipitation method and then calcined to obtain the composite -Zn-Ni-Al composite oxide. XRD, TG-DTA, SEM, , Surface area analysis and elemental analysis were used to characterize the photocatalytic degradation of methyl orange, methylene blue and rhodamine B, and the effects of Zn / Ni / Al metal atomic ratio and calcination temperature on the photocatalytic degradation of methyl orange, methylene blue and rhodamine B were investigated. The results show that the molar ratio of Zn / Ni / Al hydrotalcite precursors is 1: 1: 1, and the calcination temperature is 450 ℃, the catalytic effect of composite oxides is the best. The degradation rate of methyl orange and methylene blue can reach more than 97% after 300W UV irradiation for 60min, and the degradation rate of Rhodamine can reach 91% in 100min.