Zn／Cr型阴离子黏土的制备、表征及其对活性艳橙X-GN的去除性能研究  

Preparation and Characterization of Zn/Cr-LDHs and Their Removal Performances of Reactive Brilliant Orange X-GN

作　　者：王小蓉[1] 吴平霄[1] 

机构地区：[1]华南理工大学环境科学与工程学院,工业聚集区污染控制与生态修复教育部重点实验室,污染控制与生态修复广东省教育厅重点实验室,广州510006

出　　处：《环境科学》2012年第7期2432-2437,共6页Environmental Science

基　　金：国家自然科学基金项目(41073058,40973075);广东省科技计划项目(2006B36601004,2008B30302036);高等学校博士学科点专项科研基金项目(20100172110028);广东省自然科学基金团队项目(9351064101000001)

摘　　要：采用共沉淀法制备了Zn/Cr摩尔比为1∶1～5∶1的Zn/Cr型阴离子黏土(Zn/Cr-LDHs),选取2∶1 Zn/Cr-LDHs分别在300、400、500℃条件下放入马弗炉中煅烧2 h,制备了煅烧阴离子黏土(Zn/Cr-LDO).采用X射线衍射光谱(XRD)、傅里叶红外光谱(FTIR)、原子吸收法(ASS)、比表面积测试法(BET)对上述制备的材料结构形态进行表征.研究2∶1 Zn/Cr-LDHs和Zn/Cr-LDO在紫外和避光条件下对活性艳橙X-GN的去除.实验表明,2∶1 Zn/Cr-LDHs的吸附效果不受紫外光照射的影响,煅烧后形成的Zn/Cr-LDO在紫外光的照射下,对活性艳橙X-GN的去除率是避光条件下的2倍,说明煅烧后的Zn/Cr阴离子黏土具有光催化性能,Zn/Cr-LDO对活性艳橙X-GN的去除是吸附和光催化的共同作用.Zn/Cr-LDHs with cationic ratios of 1 ： 1 to 1：5 were prepared using the co-precipitation method. After preparation of the layered double hydroxides, 2：1 Zn/Cr-LDHs were calcined at 300, 400 and 500℃ in a Muffle furnace for 2 h. The obtained mixed oxides are also called calcined layered double hydroxides （Zn/Cr-LDO）. Structures of the obtained materials were characterized by powder X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectroscopy, atomic absorption spectrometry and BET analysis. Experiments were then carried out to investigate the removal of reactive brilliant orange X-GN by 2：1 Zn/Cr-LDHs and Zn/Cr-LDO under ultraviolet light and in dark conditions. The results showed that the removal capacity of 2：1 Zn/Cr-LDHs was not affected by ultraviolet light. Under the irradiation of ultraviolet light, the removal rate of reactive brilliant orange X-GN by Zn/Cr-LDO was twice as high as that in dark conditions, which demonstrated its photocatalysis property and its removal of reactive brilliant orange X-GN by the combined action of absorption and photocatalysis.

关 键 词：阴离子黏土 煅烧阴离子黏土 表征 活性艳橙X-GN 吸附 光催化 

分 类 号：X703.1[环境科学与工程—环境工程]