中文摘要：

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ZnCr_2O_4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.

英文摘要：

In this study,heterostructured mixed metal oxide（ MMO） semiconductors were derived from the Zn Cr-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 Zn O and Zn Cr2O4 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 Zn Cr-LDH precursor. The photocatalyst was suitable for thetreatment of wastewater containing BPA in the p H range of 5 ～ 9.