ZnO-ZnCr_2O_4混合金属氧化物的制备及其光催化降解双酚A  

The fabrication of ZnO-ZnCr_2O_4 mixed metal oxides with enhanced photocatalytic degradation of bisphenol A

作　　者：祝雅杰[1] 吴平霄[1] 杨林[1] 陈理想[1,2] 黄柱坚[3] 

机构地区：[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 [3]华南农业大学资源环境学院,广州510006

出　　处：《环境科学学报》2016年第7期2428-2435,共8页Acta Scientiae Circumstantiae

基　　金：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)~~

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.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.

关 键 词：双酚A 光催化 ZnCr-LDH 混合金属氧化物 

分 类 号：X703[环境科学与工程—环境工程]