Abstract
Microscopic structures of Zn(II) adsorbed on anatase TiO2 surface with different densities were studied using extended X-ray absorption fine structure (EXAFS) spectroscopy and density functional theory (DFT) calculation. Quantitative analysis of the EXAFS spectra showed that microscopic structures of Zn(II) were fourfold coordinated complexes, and different microscopic structures were present of the solid surface. Three modes of corner–corner/sharing-corner/sharing-edge adsorptions on anatase (101) face cluster were calculated by the DFT method. The results from DFT method were consistent with the EXAFS fittings. The optimized Zn–O average distance of the Zn–O tetrahedron was determined as about 2.00 Å. The Zn–Ti distance was 3.69 Å for the corner–corner adsorption, 3.35 Å for the sharing-corner adsorption, and 3.02 Å for the sharing-edge adsorption. According to the adsorption energies calculated by the DFT method, the microscopic structure of corner–corner adsorption was less stable than those of the other adsorption modes. With the increasing adsorption density, the corner–corner adsorption mode would be enhanced more intensively than the other adsorption modes.
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Acknowledgments
The authors thank the institute of high energy physics Chinese academy of sciences for the EXAFS spectrum unscrambling and soft support, and thank the supercomputing center of Chinese academy of sciences for the DFT soft. This work was financially supported by NNSF of China (Grant No. 21107054).
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Yang, Y., Chen, H. & Ye, C. EXAFS and DFT studies of microscopic structure with different density upon Zn(II) adsorption on anatase TiO2 . Adsorption 19, 1019–1025 (2013). https://doi.org/10.1007/s10450-013-9510-y
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DOI: https://doi.org/10.1007/s10450-013-9510-y