11-钨铬杂多阴离子层状材料的制备和表征及其光催化活性  

Preparation characterization and photocatalytic activity of 11-tungstochromic heteropoly-anion layered materials

作　　者：单秋杰[1] 杜永欣[1] 田景芝[1] 陈伟[1] 

机构地区：[1]齐齐哈尔大学化学与化学工程学院,黑龙江齐齐哈尔161006

出　　处：《化学研究与应用》2015年第7期963-968,共6页Chemical Research and Application

基　　金：黑龙江省教育厅基金项目(12531776)资助

摘　　要：采用离子交换法制备了具有Keggin结构11-钨铬三元杂多阴离子层状材料LDH-[Cu(H2O)W11Cr O39]7-,并利用红外光谱(IR)、X-射线衍射(XRD)和扫描电子显微镜配合X-射线能量色散谱仪(SEM-EDS)对其组成和结构进行了表征。结果表明:三元杂多阴离子[Cu(H2O)W11Cr O39]7-取代了粘土板层中的NO3-离子,并且仍然保留了Keggin结构。利用合成的层状材料LDH-[Cu(H2O)W11Cr O39]7-为催化剂,对孔雀石绿进行了光催化降解实验,确定了光降解反应的最佳反应条件.在最佳反应条件下,孔雀石绿的脱色率可达98.01%。并将层状材料与杂多酸盐和粘土的光催化活性进行了比较,其光催化活性顺序为:LDH-[Cu(H2O)W11Cr O39]7->K7[Cu(H2O)W11Cr O39]>Zn2Al粘土。因此表明层状材料LDH-[Cu(H2O)W11Cr O39]7具有优异的光催化活性。The 11-tungstochromic ternary heteropoly-anion with Keggin structure layered materials LDH-[Cu（ H2O） W11 Cr O39]^7-were synthesized by ion-exchange method. Their composition and structure were characterized by infrared（ IR） spectrum,X-ray diffraction（ XRD） patterns and scanning eletron microscopy assisted X-ray enery dispersive spectroscopy（ SEM-EDS）. The results indicated that the ternary heteropoly-anions[Cu（ H2O） W11 Cr O39]^7-displacing the NO3-ions in the interlayer space of clay were still Keggin structure. The photocatalytic degradation activity of malachite green solution were studied by layered materials LDH-[Cu（ H2O） W11 Cr O39]^7-catalyst and the optimal reaction conditions of photocatalytic degradation were determined. The decolorizing efficiency of malachite green is 98. 01% under the optimal reaction conditions. The photocatalytic activity of layered materials were compared to that of heteropoly salt and clay and the order of photocatalytic activity is： LDH-[Cu（ H2O） W11 Cr O39]^7-K7[Cu（ H2O）W11Cr O39]Zn2Al clay,so layered materials LDH-[Cu（ H2O） W11 Cr O39]^7-is the good photocatalytic degradation catalyst.

关 键 词：KEGGIN结构 层状材料 孔雀石绿 光催化 

分 类 号：O611.4[理学—无机化学]