磁性LDH负铜催化剂的制备及其对直接青莲D-BL的脱色  

Synthesis and evaluation of copper-loaded magnetic LDH catalysts used in decoloration of dyestuff D-BL

作　　者：刘琰[1,2] 李剑超[1] 张红[1] 刘啸乾[1] 杨晓青 毛勇[1] 

机构地区：[1]陕西师范大学环境科学系,西安710062 [2]山东海美侬项目咨询有限公司,济南250100

出　　处：《环境工程学报》2012年第10期3417-3423,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(05309011);教育部留学回国人员科研启动基金(08501041585);陕西省攻关计划项目(2011K17-03-06)

摘　　要：实验以滴定共沉淀法制备Mg-Al LDH晶体包覆的Fe3O4颗粒,利用LDH的层间阴离子交换性使其吸附[Cu(C2O4)2]-络合离子,通过焙烧获得磁性焙烧态LDH载体的负铜催化剂。并通过SEM、X-Ray、FT-IR等方法以及静态实验,表征及考察了材料的物化特性及其直接性偶氮染料直接青莲的脱色性能。结果表明,材料对该染料废水有较强去处能力,且磁性良好易于分离回收;其最佳制备条件为用浓度为20 g/L的K2[Cu(C2O4)2]溶液改性一次,反应结束后于450℃下焙烧5 h;上述条件下制备的材料投加量为1 g/L、H2O2浓度为6.53 g/L、处理时间2 h,对200、300和500 mg/L浓度的模拟直接青莲D-BL染料废水去除率分别为99.62%、90.43%和81.92%。The magnetic particles of Fe3O4 were coated by Mg-Al layered double hydroxides via co-precipitation firstly.With anion exchange reactions,the coordination compound [Cu（C2O4）2]-was intercalated into the layers of the magnetic LDHs,and the prepared solids were calcined to obtain inorganic CCML catalysis（copper-loaded magnetic LDH catalysts）.The catalysts were characterized via SEM,X-Ray,FT-IR.And the catalysis performance of them was evaluated with a set of static experiments.Optimum conditions of preparation were that the magnetic LDHs were modified by [Cu（C2O4）2]-solution for one time,the temperature and time of calcination were 450℃ and 5 h,respectively.In the static CWPO experiments of decoloration of direct violet D-BL,CCML catalysts can obtain removal rates of 99.62%,90.43% and 81.92% with original dye concentrations of 200,300 and 500 mg/L,respectively.

关 键 词：LDH 焙烧 催化 染料废水 CWPO 

分 类 号：X703[环境科学与工程—环境工程]