Characterization of arsenate adsorption on amor-phous Algels with Keggin structure by Fourier transformed infrared spect
Fourier transformed infrared spectrometry (FTIR) and 27Al Magic Angle spinning (MAS) nuclear mag-netic resonance spectroscopy were employed to characterize arsenate adsorption on amorphous AI gels with Keggin structure at pH=4-10. These studies have proven that: the surface complex species of arsenate show significant dif-ferences under acidic and alkaline conditions, which was deduced based on the As-O stretching vibration bands lo-cated respectively at 774 and 870 cm-1; poorly crystalline Al13 (or Al)-arsenate precipitation could be easily formed under acid medium condition and high loading level, which was supported by comparing the As-O vibration (at≈732 cm-1) of precipitation to adsorbed Al gels; arsenate (AsO43-) adsorption has no effect on the Keggin structure of Al gels with basicity (R) =2.6 and 3.0, even at high loading level, as evidenced by the signal at ≈63×10-6 of magic angle spinning (MAS)-27Al NMR. The adsorption envelope was determined by conventional batch experiments.
作 者： LIU Jing ZHAO Fenghua 作者单位： LIU Jing(The Key State Laboratory of Coal Resource & Mining Safety, China University of Mining and Technology, Beijing 100083, China)ZHAO Fenghua(Department of Resource and Earth Science, China University of Mining and Technology, Beijing 100083, China)
刊 名： 中国地球化学学报（英文版） 英文刊名： CHINESE JOURNAL OF GEOCHEMISTRY 年，卷(期)： 2009 28(1) 分类号： P59 关键词： FTIR 27Al-MAS NMR adsorption Keggin structure