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研究报告

祝雅杰,吴平霄,杨林,陈理想,黄柱坚.ZnO-ZnCr₂O₄混合金属氧化物的制备及其光催化降解双酚A[J].环境科学学报,2016,36(7):2428-2435

The fabrication of ZnO-ZnCr₂O₄ mixed metal oxides with enhanced photocatalytic degradation of bisphenol A

基金项目：国家自然科学基金（No.41472038，41273122，41073058）；广东省科技计划项目（No.2014A020216002）；广州市科技计划项目（No.201604020064）；中央高校基本业务费项目（No.2015ZP007）

陈理想
1. 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广东省环境风险防控与应急处置工程技术研究中心, 广州 510006;2. 广平大学, 越南, 广平

摘要：采用共沉淀法制备前驱体ZnCr-LDH，并在不同煅烧温度下制备ZnCr混合金属氧化物（ZnCr-MMO）。同时，利用XRD、SEM、TEM、XPS、PL、UV-vis等对样品的结构、形貌、光学性能进行表征分析。最后，在模拟太阳光照射下，通过光催化降解双酚A研究材料的光催化活性。结果表明，所制备的混合金属氧化物由ZnO和ZnCr₂O₄组成，煅烧温度越高，结晶度越高；与ZnCr-LDH相比，ZnCr-MMO的紫外-可见吸收光谱在紫外和可见光范围均有较强的吸收；随着煅烧温度的升高，ZnCr-MMO荧光光谱强度先减弱后增强；与ZnCr-LDH相比，ZnCr-MMO的光催化活性明显提高，煅烧温度为700 ℃时制得的ZnCr-MMO光催化活性最高，对BPA的降解率达到75%；该催化剂适于处理pH为5~9的含BPA的废水。

Abstract：In this study, heterostructured mixed metal oxide (MMO) semiconductors were derived from the ZnCr-LDH precursor followed by controllable calcination. The physicochemical features of the samples calcinated at different temperatures were obtained through the XRD, SEM, TEM, UV-vis, XPS, PL analysis. The XRD patterns show that ZnO and ZnCr₂O₄ spinel were formed with different degree of crystallinity depending on the calcination temperature (400~800 ℃). The UV-vis absorption spectra revealed an enhanced light absorption property of the calcinated materials, as compared to the precursor. According to the PL results, MMO-700 exhibited the most effective surface charge transfer, which might contribute to the enhanced photocatalytic activity for degradation of pollutants. All the samples presented active as heterogeneous photocatalysts. Typically, the photocatalytic degradation of BPA was calculated as 75% for MMO-700, which was much higher than that for ZnCr-LDH precursor. The photocatalyst was suitable for the treatment of wastewater containing BPA in the pH range of 5~9.