FTIR Spectroscopic Analysis of Cu2+ Adsorption on Hematite and Bayerite
WANG Shuai1,2, WANG Nan3, LI Cui-lan1, ZHANG Jin-jing1*, DOU Sen1
1. College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, China 2. Popularization Center of Agricultural Technology of Jilin City, Jilin 132013, China 3. Jilin Agriculture Science and Technology College, Jilin 132101, China
Abstract：The changes in surface hydroxyl structures and their absorption peaks after the adsorption of Cu2+ on the hematite and bayerite were studied by FTIR spectroscopy under the different pH values and Cu2+ concentrations. The result indicated that: (1) with the increase of Cu2+ concentrations, the H—O—H and OH deformation vibration of the hematite participated in the adsorption and Cu2+ combined with the Fe—O structure strongly, then Fe—O—(Cu) had been formed on the hematite surface. (2) In acid conditions, H+ in the solution destroyed the O—H structure of hematite surface and the existence of NO-3 prompted the production of a new peak (1 131 cm-1). With pH value increasing, the hydroxy structure of hematite surface changed gradually from stretching vibration to deformation vibration, then the structures of Fe—OH and Fe3+—O2- constantly changed. (3) The adsorption of Cu2+ on the bayerite happened in the high wave position. With the Cu2+ concentration increasing, the free OH bending vibration, the OH- stretching vibration and its H—O—H bending vibration were all involved in the adsorption, and at the same time, Al3+ of Al—O was gradually replaced by Cu2+, which enhanced the vibration intensity of the low waves position. (4) With the increase in pH, the Al—OH bending vibration and Al—O stretching vibration changed gradually, which indicated that AlOCu+ and AlOCuOH structure had been formed on the bayerite surface after the adsorption.
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