多角金属纳米镍的化学液相制备、表征以及负载TiO2的光催化研究  

Synthesis,Characterization of Multiangular Nickel Nanoparticles and its Photocatalytic Properties after Loaded TiO_2

作　　者：胡方能[1] 陈玉萍[1] 朱俊杰[1,2] 

机构地区：[1]南京大学化学化工学院,生命分析化学教育部重点实验室,南京210093 [2]南京大学-金川公司金属化学联合实验室,南京210093

出　　处：《无机化学学报》2009年第1期81-86,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20635020);江苏自然科学基金(No.BK2006114)资助项目

摘　　要：用不同剂量的水合肼还原镍盐以制备金属镍纳米材料。通过调节添加剂(十六烷基三甲基溴化铵(CTAB),聚乙烯吡咯烷酮(PVP),聚乙二醇(PEG-20000))用量,pH值等来控制金属镍的形貌和尺寸。用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对所合成样品的物相结构及形貌进行了表征,结果表明:以CTAB为添加剂,pH控制在12.4时可得到具有特殊多角结构的立方相镍纳米颗粒,其内核直径为400～600nm,分散较均匀。采用表面吸附仪测定了样品的N2吸附脱附等温线,并由BET理论模型计算出样品的比表面积。通过层层组装的方法在其表面担载TiO2,制备了镍-二氧化钛复合材料,研究了复合材料在紫外光照射下降解亚甲基兰的性能。实验结果表明,复合材料具有良好光催化性能,利用镍的磁性,还能方便地实现从催化体系中的分离,以便回收利用。Nickel Nanoparticles were synthesized via the reduction reaction between NiSO4·6H2O and N2H4·H2O. The morphology and size of the nickel nanoparticles were controlled by adjusting the amount of cethyltrimethylammonium bromide（CTAB）, polyvinylpyrrolidone（PVP）, polyethylene glycol（PEG-20000） and the pH value. The product was characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and scanning electron microscopy（SEM）. The Nitrogen absorption-desorption isotherm of the samples was measured by volumetric absorption analyzer. The specific surface area and average particle diameter of the sample were calculated from the BET academic model. The experimental results indicated that the special muhiangular nickel nanoparticles with the core diameter of 400-600 nm could be obtained by adjusting the pH at 12.4 and the additive CTAB. TiO2 was loaded on the surface of nickel nanoparticles by a layer-by-layer technique. The TiO2-Ni composites showed the effect of photocatalytic degradation for methylene blue. Moreover, the composites could be magnetic separation due to the magnetism of Ni.

关 键 词：镍 复合材料 光催化 纳米材料 

分 类 号：O614.813[理学—无机化学]