Synthesis of hierarchical flower-like Mg 2 Al-Cl layered double hydroxide in a surfactant-free reverse microemulsion
Hierarchical flower-like Mg Al-Cl LDH microspheres were synthesized using a reverse surfactant-free microemulsion (SFME) route at a low temperature (∼25°C), and characterized by XRD, TEM, SEM, FT-IR, TG, N adsorption/desorption, and elemental analyses. The SFME used consists of n-hexane, isopropanol...
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Published in | Journal of colloid and interface science Vol. 505; p. 816 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.11.2017
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Subjects | |
Online Access | Get full text |
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Summary: | Hierarchical flower-like Mg
Al-Cl LDH microspheres were synthesized using a reverse surfactant-free microemulsion (SFME) route at a low temperature (∼25°C), and characterized by XRD, TEM, SEM, FT-IR, TG, N
adsorption/desorption, and elemental analyses. The SFME used consists of n-hexane, isopropanol, and water. The so-obtained flower-like microspheres are constructed with LDH nanosheets with ∼10nm thickness. After destroyed by calcination, their crystal structure and flower-like morphology can be reconstructed by rehydration. The flower-like LDH and its calcined product (CLDH) have large specific surface areas being ∼84.3 and 163.9m
g
, respectively. The sorption of methyl orange (MO) on the LDH and CLDH were determined, showing high MO sorption capacities of ∼559 and 1112gg
, respectively, which are obviously higher than those reported for conventional LDHs and CLDHs. Possible mechanisms for the flower-like microsphere formation and the MO sorption are discussed. Our results demonstrate that, like traditional surfactant-based microemulsions, SFMEs as microreactors or templates can be used to synthesize nanomaterials. The hierarchical flower-like LDH microspheres and their calcined product have potential applications such as in the treatment of organic waste water. |
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ISSN: | 1095-7103 |