Abstract
Cationic dye sorption by Zn-Al-layered double hydroxides (LDHs) modified with anionic surfactants was examined using methylene blue (MB) dye as a compound model in aqueous solutions. The modification of Zn-Al LDHs was performed by reconstruction method using dodecyl sulfate anion (DS) solutions. DS contained Zn-Al LDHs were characterized by XRD, FTIR, thermogravimetric, and SEM analysis. The reconstructed organo/Zn-Al LDHs comprise the crystalline phases (DS-intercalated LDHs, hydrotalcite), and the amorphous phase. The intercalation of DS ions into the interlayer galleries and DS adsorption on the surface of the LDHs occurred causing the MB adsorption on the external and its sorption in the internal surfaces of modified LDHs. The presence of DS greatly increased the affinity of organo/Zn-Al LDHs for MB due to hydrophobic interactions between the surfactants and the dye molecules. The optical properties of sorbed MB were studied.
Highlights
Facing the ever-growing demand for materials combining several properties, research is extensively devoted to the preparation of multifunctional assembly in which the different components may act in synergism
Characterization The XRD pattern of the as-synthesized ZnAl LDH contains the characteristic reflections of layered double hydroxides with the basal planes of (003), (006), and (009) peaks at low 2θ angles and the other peaks for (101), (015), (0012), (110), and (113) planes at high 2θ angles (Fig. 1)
The modification of ZnAl LDHs in dodecyl sulfate anion (DS) solutions by reconstruction method is the facile way of preparation of organo/LDH nanohybrids for the sorption of cationic dye methylene blue (MB) from the aqueous medium
Summary
Facing the ever-growing demand for materials combining several properties, research is extensively devoted to the preparation of multifunctional assembly in which the different components may act in synergism. In such approach, the layered compounds are of great interest [1], and some interesting multifunctionalities are reported such as drug delivery systems using lamellar nanocomposites with incorporated drug [2], the flexible solar cell using layered compound-metal particle composites [3], and flat-panel displays using graphene oxide liquid crystals [4].
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