ZHU Qiang, PAN Yu-guan, ZHANG Xiao-ke, CAI Yuan-feng*
(1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
2. State Key Laboratory of Mineral Deposits Research, Nanjing 210023, China)

Abstract: The structure changes between the Na-montmorillonite adsorbed Ni2+ and its product by thermal treatment of 500 ℃ were studied in this paper. The analytical techniques including X-ray fluorescence (XRF), powder X-ray diffraction (XRD), electron spin resonance (ESR), Fourier Transform infrared spectroscopy (FTIR), and extended X-ray absorption fine structure spectrometry (EXAFS) have been applied to study characteristics of solid products. The chemical compositions of the residue solutions, analyzed by using inductively coupled plasma atomic emission spectroscopy (ICP-AES), indicate that the Ni2+ content in residual solution is reduced significantly and a bit of Na+, Mg2+ in residual solution had been tested after the Ni2+ adsorption. XRD results also suggest that the Ni2+ replaced Na+ in the interlayer domain of montmorillonite. Both EXAFS and ESR results further suggest that Ni2+ is presented in form of [Ni(H2O)6]2+ in the interlayer domain of montmorillonite after the Ni2+ adsorption . The XRD and FTIR results suggest that there is talc phase in the product of Ni2+-montmorillonite calcined at 500 ℃.

Keywords: montmorillonite; nickel; thermal treatment; adsorption

ACTA MINERALOGICA SINICA Vol. 39, No.5, 2019, page 559-567