Abstract
Effects of process parameters such as concentrations of FeCl2, NaOH, and drying temperature on the formation mechanism and chemical characteristics of ferrihydrite-modified diatomite are studied by using X-ray absorption near-edge structure spectroscopy. The spectra were recorded in total electron yield mode and/or fluorescence yield mode to investigate the chemical nature of Fe and Si on the surface and/or in the bulk of ferrihydrite-modified diatomite, respectively. It was found that only the surface SiO2 was partially dissolved in the NaOH solution with stirring and heating, whereas the bulk of diatomite seemed to be preserved. The dissolved Si was incorporated into the structure of ferrihydrite to form the 2-line Si-containing ferrihydrite on the surface of diatomite. The crystalline degree of ferrihydrite increased with the increasing FeCl2 concentration and the Brunauer–Emmett–Teller specific surface area of ferrihydrite-modified diatomite decreased with the increasing FeCl2 concentration. The crystalline degree of ferrihydrite decreased with the increase of NaOH concentration. The high temperature calcination caused an energy shift in the Si L-edge spectra to the high energy side and a transformation of Si-containing ferrihydrite to crystallized hematite might occur when ferrihydrite-modified diatomite is calcined at 900°C. In this study, the optimal synthesis conditions for the ferrihydrite-modified diatomite with the least crystalline Si-containing ferrihydrite and the highest surface area were found to be as the follows: 0.5 M FeCl2 solution, 6 M NaOH solution and drying temperature of 50°C.
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Acknowledgments
This research project was supported through a discovery research grant from the Natural Sciences and Engineering Research Council of Canada and an international research grant from China. The authors are grateful to D. Fisher, technologist at the University of Saskatchewan, for his assistance in the environmental laboratory. We also would like to express our thanks to Drs. T. Regier and L. Zuin for their assistance at the Canadian Light Source Inc. where the XANES synchrotron experiments have been carried out.
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Xiong, W., Peng, J. & Hu, Y. Chemical analysis for optimal synthesis of ferrihydrite-modified diatomite using soft X-ray absorption near-edge structure spectroscopy. Phys Chem Minerals 36, 557–566 (2009). https://doi.org/10.1007/s00269-009-0301-7
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DOI: https://doi.org/10.1007/s00269-009-0301-7