ZnNiAl水滑石基复合金属氧化物的制备及其高效光催化性能

来源期刊:中国有色金属学报(英文版)2016年第9期

论文作者:张丽 戴超华 张秀秀 刘又年 阎建辉

文章页码:2380 - 2389

关键词:ZnNiAl水滑石;复合金属氧化物;光催化降解;光催化性能

Key words:ZnNiAl layered double hydroxide; mixed oxide; photocatalytic degradation; phototatalytic activity

摘    要:采用水热法将ZnNiAl金属盐溶液混合制得一系列水滑石前驱体,通过在不同温度下焙烧后获得ZnO/NiO/ZnAl2O4纳米复合物。利用SEM、HRTEM、TEM、XRD、BET、TG-DTA 和UV-Vis DRS 测试方法对样品进行表征。在模拟太阳光照射下,通过测定甲基橙溶液的光催化降解率来评价样品的光催化活性。研究Zn/Ni/Al摩尔比、焙烧温度等对样品结构组成、形貌及光催化活性的影响。结果表明,相比水滑石前驱体,ZnO/NiO/ZnAl2O4纳米复合物有更好的光催化性能,当原料中Zn/Ni/Al摩尔比为2:1:1时,在600 °C 焙烧所得的催化剂具有最佳光催化活性。在模拟太阳光照射下,60 min内对浓度为100 mg/L甲基橙的降解率达97.3%,相同条件下远远超过了Degussa P25的活性。并且对ZnO/NiO/ZnAl2O4纳米复合物可能的光催化机理进行了探讨。

Abstract: ZnO/NiO/ZnAl2O4 mixed-metal oxides were successfully synthesized through a hydrotalcite-like precursor route, in which appropriate amounts of metal salts solutions were mixed to obtain a new series of ZnNiAl layered double hydroxides (LDHs) as precursors, followed by calcination under different temperatures. The as-obtained samples were characterized by SEM, HRTEM, TEM, XRD, BET, TG-DTA, and UV-Vis spectra techniques. The photocatalytic activities of the samples were evaluated by degradation of methyl orange (MO) under the simulated sunlight irradiation. The effects of Zn/Ni/Al mole ratio and calcination temperature on the composition, morphology and photocatalytic activity of the samples were investigated in detail. The results indicated that compared with ZnNiAl-LDHs, the mixed-metal oxide showed superior photocatalytic performance for the degradation of MO. A maximum of 97.3% photocatalytic decoloration rate within 60 min was achieved from the LDH with the Zn/Ni/Al mole ratio of 2:1:1 and the calcination temperature of 500 °C, which much exceeded that of Degussa P25 under the same conditions. The possible mechanism of photocatalytic degradation over ZnO/NiO/ZnAl2O4 was discussed.

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