Zhang Yude, Liu Qinfu, Xiang Jingjing, Zhang Shilong, Frost Ray L
Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, PR China; School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, PR China.
J Colloid Interface Sci. 2014 Jul 15;426:99-106. doi: 10.1016/j.jcis.2014.03.057. Epub 2014 Apr 5.
The particle size, morphology, crystallinity order and structural defects of four kaolinite samples are characterized by the techniques including particle size analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR) and magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR). The particle size of four kaolinite samples gradually increases. Four samples all belong to the ordered kaolinite and show a decrease in structural order with the increase of kaolinite particle size. The changes of structural defect are proved by the increase of the band splitting in Raman spectroscopy, the decrease of the intensity of absorption bands in infrared spectroscopy, and the decrease of equivalent silicon atom and the increase of non-equivalent aluminum atom in MAS NMR spectroscopy. The differences in morphology and structural defect are attributed to the broken bonds of Al-O-Si, Al-O-Al and Si-O-Si and the Al substitution for Si in tetrahedral sheets.
采用粒度分析、扫描电子显微镜（SEM）、X射线衍射（XRD）、拉曼光谱、傅里叶变换红外光谱（FTIR）和魔角旋转核磁共振光谱（MAS NMR）等技术对四个高岭土样品的粒度、形态、结晶度顺序和结构缺陷进行了表征。四个高岭土样品的粒度逐渐增大。四个样品均属于有序高岭土，且随着高岭土粒度的增加，结构有序度降低。拉曼光谱中谱带分裂的增加、红外光谱中吸收带强度的降低以及MAS NMR光谱中等价硅原子的减少和非等价铝原子的增加证明了结构缺陷的变化。形态和结构缺陷的差异归因于Al-O-Si、Al-O-Al和Si-O-Si的断键以及四面体片中Al对Si的取代。
