高比表面积介孔氧化镍制备及表征

摘要

Mesoporous nickel oxide(NiO)nanoparticles were synthesized by the thermal decomposition strategyof Ni(NO3)2·9H2O using oxalic acid dihydrate as the mesoporous template agent. The pore structure of nanocrystals could be controlled by the precursor to oxalic acid ratio,thermal decomposition temperature and thremal decomposition time. The texture and chemistry of nickel oxide nanocrytals were characterized by X-ray diffraction( XRD) ,Transmission electron microscopy( TEM) ,Scanning electron microscopy ( SEM) and N2 adsorption-desorption isotherms. The results showed that the most excellently mesoporous nickel oxide particles( m-Ni-1-4)with developed wormlike pores were prepared under the conditions of the mulled equimolar precursor and oxalic acid,cal-cined 4 h at 400℃. The specific surface area and pore volume of m-Ni-1-4 are 236 m2·g-1 and 0. 42 cm3·g-1 ,respectively.%采用硝酸镍和草酸为原料，采用固态热分解法制备得到高比表面积的介孔NiO纳米粒子，考察了原料的用量，热处理的温度，热处理的时间对孔结构的影响。用X射线衍射、透射电镜、扫描电镜和N2吸附-脱附技术对材料的物化性质进行了表征。结果表明：硝酸镍和草酸1∶1混合均匀、400℃灼烧4 h得到的介孔NiO粒子的孔结构为最发达的蠕虫状介孔结构，比表面积和孔容分别达到236 m2·g-1和0．42 cm3·g-1。