Preparation of nanostructured microspheres of Zn–Mg–Al layered double hydroxides with high adsorption property

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 415; pp. 195 - 201
• Main Authors: Zheng, Yun-Min, Li, Na, Zhang, Wei-De
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.12.2012
• Subjects: Adsorption; colloids; crystal structure; Hydrotalcite-like compounds; hydroxides; Layered double hydroxides; Methyl orange; sorption isotherms; surface area; Hydrotalcite-like compounds; Adsorption; Methyl orange; Layered double hydroxides
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2012.10.014

The hierarchical nano/micro-structured Zn–Mg–Al layered double hydroxides show high adsorption property for removing organic pollutants. [Display omitted] ► Hierarchical nano/micro-structured Zn–Mg–Al layered double hydroxides were prepared. ► The ZnMgAl-LDHs can effectively adsorb methyl orange. ► The adsorption kinetics of methyl orange follows the pseudo-second-order kinetic model. ► The adsorption isotherm of methyl orange can be depicted by Langmuir equation. In this paper, hierarchical nano/micro-structured Zn–Mg–Al layered double hydroxides (ZnMgAl-LDHs) were successfully synthesized by a one-step urea-method. The morphology, structure, surface area, and adsorption properties of the prepared samples were characterized. The results show that the ZnMgAl-LDHs are of high crystallinity with large surface area, which is favorable for the adsorption. The optimum pH value for the adsorption of methyl orange onto the ZnMgAl-LDHs is 3.0. The adsorption process can be well described by the pseudo-second-order kinetic model. The adsorption isotherm of methyl orange onto the ZnMgAl-LDHs can be depicted by both Freundlich and Langmuir equations, but the latter model matches the results much better than the former one.