Belay Zeleke Dilnesa - Eawag-Empa Library

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CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES The absorption band in the range between 3000 cm -1 and 3600 cm -1 is due to OH stretching vibrations resulting from the interlayer water. In the case of Fe-Mc the weak bands at 661 cm -1 and 960 cm -1 are attributed to FeO6 vibrations. Like the Al-analogues, ٧2-CO3 2- vibrations in Fe-Mc spectrum are found at about at 710 cm -1 and 875 cm -1 respectively. The sharp band at 1382 cm -1 is related to the vibration of ٧3-CO3 2- . The broad band between 2700 cm -1 and 3320 cm -1 is due to the vibration of OH bonds in the interlayer water of Fe-Mc. The bands at frequencies higher than 3600 cm -1 can be related to the vibrations of OH in the main layer [Ca2.Al/Fe(OH)12] + . The peaks between 3000 cm -1 and 3600 cm -1 are sharper for Al-Mc than Fe-Mc indicating more highly coordinated interlayer water in Al-Mc. Table 10 IR vibrations of Ca4[(AlxFe1-x)2(OH)12] . CO3 . nH2O. Al-Mc Fe-Mc Wavenumbers (cm -1 ) Vibrations Wavenumbers (cm -1 ) Vibrations 670 AlO6 661 FeO6 720 4-CO3 2- 710 4-CO3 2- 817 AlO6 880 2-CO3 2- 875 2-CO3 2- 952 AlO6 960 FeO6 1360 3-CO3 2- 1382 3-CO3 2- 1415 3-CO3 2- 1651 2-H2O 3007 1-H2O 3369 1-H2O 2700-3320 1-H2O 3518 OH - 3505 OH - 3616 OH -a 3668 OH -a 3653 OH -a a associated to the main layer 3.1.4. Mixed CaO.(AlxFe1-x)2O3.CaCO3.nH2O systems Variations of the Al/Fe ratio in the 3CaOAl2O3CaCO311H2O - 3CaOFe2O3CaCO312H2O system resulted in the formation of two separate stable 53
CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES phases (no systematic peak shifts) while no intermediate phase formed (Fig. 17). The intensity of the small intermediate peak at 11.39° 2θ was found to depend on the water content as it decreased upon drying. To index the reflections and to determine the layer thickness and the unit cell parameter a, a Le Bail fitting was performed. The results are shown in Fig. 18 and Fig. 19, respectively. No significant variation of both parameters with varying Al mole fraction was observed compared to end member values. These results clearly confirm the absence of a solid solution between Al-Mc and Fe-Mc, in contrast to the findings reported elsewhere [70]. Thus, comparison of the XRD pattern further corroborate that 3CaOAl2O3CaCO311H2O and 3CaOFe2O3CaCO312H2O have different structural symmetries, carbonate location and different amounts of water molecules in the interlayer. Intensity Intensity [arb. [arb. units] Fe-Mc * Al-Mc 1.0 0.7 0.5 10 11 12 2CuK 2CuK 13 0.3 0.0 14 Al/(Al+Fe) ratio Fig. 17 XRD pattern of the Al/Fe-Mc after 3 years hydration time at 20 °C * peak due to additional water in Mc. 54
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Fe-containing hydrates and their fa
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The measured composition of the liq
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ZUSAMMENFASSUNG Thermodynamische Mo
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konnten die Fe-haltigen Hydrate im
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I owe to thank all the laboratory t
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Table 19 Compositions of Al/Fe-mono
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LIST OF FIGURES Fig. 1 Calculated v
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Fig. 34 Calculated solubility produ
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Fig. 62 Calculated solubility produ
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Table of Contents TABLE OF CONTENTS
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TABLE OF CONTENTS 3. SYNTHETIC FE
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TABLE OF CONTENTS 3.5.4. Solid solu
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1 INTRODUCTION CHAPTER 1 INTRODUCTI
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Page 40 and 41: 3CaOAl2O3 + 6H2O → 3CaOAl2O36H2O
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CHAPTER 3 SYNTHETIC FE-CONTAINING H
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CHAPTER 4 FE-CONTAINING HYDRATES IN
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(Al+Fe)/Ca (Al+Fe)/Ca 0.8 0.6 0.4 0
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k 3 (k) CHAPTER 4 FE-CONTAINING HYD
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differentiated relative weight Weig
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Early reaction CHAPTER 4 FE-CONTAIN
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weight loss in % differentiated rel
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5. GENERAL CONCLUSION AND OUTLOOK a
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Speciation of iron(III) in hydrated
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5. GENERAL CONCLUSION AND OUTLOOK
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Techniques XRD X-ray diffraction TG
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APPENDIX APPENDIX Appendix A: Addit
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Intensity (arb. Units) P Fe 2O 3 R
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APPENDIX Appendix B7 XRD patterns o
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REFERENCES REFRENCES [1] H.F.W. Tay
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REFRENCES [29] M. Vespa, R. Dähn,
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REFRENCES [54] M. Balonis, B. Lothe
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REFRENCES [81] H.F.W. Taylor, Cryst
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REFRENCES [107] K. Kyritsis, N. Mel
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REFRENCES [134] M. Wilke, F. Farges
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CURRCULUM VITAE Curriculum Vitae Na
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