Fast aging treatment for the synthesis of hydrocalumites using microwaves
Source abstract
Abstract
Abstract Friedel's salt [Ca 2 Al(OH) 6 ]Cl·2H 2 O, commonly known as hydrocalumite, was synthesized by co-precipitation following different aging treatments, using microwave irradiation or conventional heating and by refluxing or in autoclave, with the aim of decreasing the aging times (24 h) employed when aging by conventional heating or at room temperature. Hydrocalumites were characterized by XRPD, FT-IR, N 2 physisorption, ICP-OES, TEM, TEM-electron diffraction and TGA techniques. The use of microwaves favors a faster crystalline growth in the stacking direction whereas the use of autoclave improves the lamellar crystallinity. The highest crystallinity was found for the sample aged with microwave irradiation by autoclaving at 453 K for 1 h. This sample presented the highest crystallite size in the stacking direction (76 nm), the largest lamellar crystals (4000 nm) with R 3 c symmetry, and the highest dehydration- and dehydroxylation temperatures.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Layered Double Hydroxides Synthesis and Applications · Magnesium Oxide Properties and Applications · Zeolite Catalysis and Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
Show source-provided references
1. CuNi/Al hydrotalcites synthesized in presence of microwave irradiation10.1016/j.matlet.2011.03.004 ↗
2. Influence of microwave radiation on the textural properties of layered doublé hydroxides10.1016/j.micromeso.2006.03.038 ↗
3. Microwave effect during aging on the porosity and basic properties of hydrotalcites10.1016/j.micromeso.2006.11.033 ↗
4. Base catalysts derived from hydrocalumite for the transesterification of sunflower oil10.1021/ef9009394 ↗
5. Hydrotalcite-type anionic clays: preparation, properties and applications10.1016/0920-5861(91)80068-K ↗
6. New synthesis route of hydrocalumite-type materials and their application as basic catalysts for aldol condensation10.1016/j.clay.2010.09.019 ↗
7. Cullity · 2001
8. Layered double hydroxides and human health: an overview10.1016/j.clay.2006.06.010 ↗
9. Multiwavelength luminescence in lanthanide-doped hydrocalumite and mayenite10.1021/cm200408x ↗
10. Base catalysis in the synthesis of fine chemicals10.1023/B:TOCA.0000029802.75155.5a ↗
11. Synthesis and Raman spectroscopic characterisation of hydrotalcites based on the formula Ca6Al2(CO3)(OH)16·H2O10.1002/jrs.2827 ↗
12. Gay · 1972
13. Layered double hydroxide films: synthesis, properties and applications10.1039/c0cc00313a ↗
14. Synthetic hydrotalcite-type and hydrocalumite-type layered double hydroxides for arsenate uptake10.1016/j.clay.2010.03.017 ↗
15. A novel conversion process for waste slag: synthesis of a hydrotalcite-like compound and zeolite from blast furnace slag and evaluation of adsorption capacities10.1039/c0jm00518e ↗
16. Applications of layered double hydroxides. Layered double hydroxides10.1007/430_007 ↗
17. Exfoliating layered double hydroxides in formamide: a method to obtain positively charged nanosheets10.1039/b605422f ↗
18. The AFm phase in Portland cement10.1016/j.cemconres.2006.10.010 ↗
19. A new investigation of the Cl−–CO32− substitution in AFm phases10.1111/j.1551-2916.2010.04305.x ↗
20. Ca/Al mixed oxides as catalysts for the Meerwein–Ponndorf–Verley reaction10.1007/s10562-010-0329-9 ↗
21. Near- and mid-infrared spectroscopy study of synthetic hydrocalumites10.1016/j.solidstatesciences.2010.10.017 ↗
22. Moore · 1989
23. Mechanism of the anion exchange reactions of the layered double hydroxides (LDHs) of Ca and Mg with Al10.1016/j.solidstatesciences.2005.05.004 ↗
24. Cement and concrete nanoscience and nanotechnology10.3390/ma3020918 ↗
25. Layered double hydroxide-like materials: nanocomposites for use in concrete10.1016/j.cemconres.2004.05.012 ↗
26. Insights on the structural chemistry of hydrocalumite and hydrotalcite-like materials: investigation of the series Ca2M3+(OH)6Cl·2H2O (M3+: Al3+, Ga3+, Fe3+, and Sc3+) by X-ray powder diffraction10.1006/jssc.2002.9635 ↗
27. Use of delaminated hectorites as supports of copper catalysts for the hydrogenolysis of glycerol to 1,2-propanediol10.1016/j.cej.2011.11.011 ↗
28. Green synthesis of hydrocalumite-type compounds and their evaluation in the transesterification of castor bean oil and methanol
29. Oriented CoSAPO-5 membranes by microwave-enhanced growth on TiO2-coated porous alumina10.1002/anie.201108042 ↗
30. Catalysis by hydrotalcites and related materials10.1023/B:CATT.0000007166.65577.34 ↗
31. Microwave radiation and mechanical grinding as new ways for preparation of saponite-like materials10.1016/j.clay.2009.11.018 ↗
32. Microwave-assisted synthesis of saponite10.1016/j.clay.2009.11.020 ↗
33. Hydrocalumite and its polymer derivatives. 1. Reversible thermal behavior of Friedel's salt: a direct observation by means of high-temperature in situ powder X-ray diffraction10.1021/cm031069j ↗
34. A general and scalable formulation of pure CaAl-layered double hydroxide via an organic/water solution route10.1021/ie102135k ↗
35. Efficient and controllable phosphate removal on hydrocalumite by multi-step treatment based on pH-dependent precipitation10.1016/j.cej.2012.01.086 ↗