三维花状复合材料Fe_3O_4-ZnO的制备与性能研究  

Preparation and Properties of Three-dimensional Flower-like Fe_3O_4-ZnO Composites

作　　者：宋伟明[1] 孙晶晶[1] 孙立[1] 马帅[1] 刘鹏[1] 王斐[1] 

机构地区：[1]齐齐哈尔大学化学与化学工程学院,齐齐哈尔161001

出　　处：《人工晶体学报》2015年第6期1630-1636,共7页Journal of Synthetic Crystals

基　　金：黑龙江省自然科学基金(B201010);黑龙江省教育厅面上项目(12511595)

摘　　要：以FeCl3、Zn(Ac)2、NH3·H2O等为原料,采用水热法制备了三维花状Fe3O4-ZnO磁性复合材料。通过SEM、XRD、XPS、ICP、UV-VisDRS及VSM等对样品组成、结构等进行了表征,并以亚甲基蓝为目标降解物,考察了不同Fe/Zn摩尔比复合材料在紫外光照下的光催化活性。结果表明,n(Fe/Zn)为0.36时,Fe3O4-ZnO复合材料表现出较优异的光催化活性,在180min内对亚甲基蓝的降解率达到99.3%。SEM分析表明Fe3O4-ZnO复合材料由六棱柱纳米棒自组装而成,与纯ZnO相比,该Fe3O4-ZnO复合材料紫外线吸收发生红移,拓展了ZnO的可见光响应。此外,该复合材料具有较强磁性(饱和磁化强度是24.91emu/g),可通过外加磁场将其分离回收,重复使用四次后对亚甲基蓝的降解率仍达到95.5%。Three-dimensional flower-like Fe3O4-ZnO composites were fabricated via the hydrothermal reaction using Fe Cl3,Zn（ Ac）2as raw materials and NH3·H2O as a structure directing agent. The composites was characterized by means of SEM, XRD, XPS、ICP、UV-Vis DRS and VSM. The photocatalytic property of the composites with different n（ Fe / Zn） was also studied for decolorization of methylene blue under ultraviolet irradiation. The experimental results show that the Fe3O4-ZnO composites has excellent photocatalytic activity（ n（ Fe / Zn） = 0. 36） and the degradation percentage of the dye（ methylene blue） can be up to 99. 3% after 180 min. Fe3O4-ZnO composites consist of hexagonal prisms nanorods self-assembly. Remarkably,compared with pure ZnO,the composites are red-shifted of the ultra-violet absorption edge,expanding the response to visible light. Notably, the as-prepared materials has good magnetic（ saturation magnetization intensity was 24. 91 emu / g）, facilitating separation and recycle of catalyst materials through additional magnetic field. The photocatalyst can be reused four times without considerable loss of activity and the photocatalyst still has a degradation rate of95. 5%.

关 键 词：水热法 Fe3O4-ZnO 光催化 饱和磁化强度 

分 类 号：O643[理学—物理化学]