Abstract
Layered double hydroxides (LDHs) are also known as hydrotalcite-like compounds or anionic clays. In this work, ZnAl-LDH films were prepared on aluminium (Al) plates by a hydrothermal technique using zinc nitrate solution as the precursors. ZnAl-LDHs films were characterized by SEM, EDX, XRD and FT-IR. The SEM analysis revealed that the ZnAl-LDH films with hierarchical nanoarchitectures on the surface of Al plates. EDX mapping and elemental analysis also showed that Zn, Al, and O dispersed uniformly on the aluminium substrates. XRD results were used to confirm the presence of ZnAl-LDH films as they appeared purely with the typical (003) and (006) peaks of LDH diffraction. The characteristic bands of bending vibrations due to the intercalating water, stretching vibration due to the overlapping signal of carbonate anion and nitrate anion were measured by FT-IR spectroscopy. The brucite structure also exhibited the OH-stretching vibration as well as the ZnO lattice vibration in the spectra. These ZnAl-LDH forms were evaluated for their removal performance against orange II dye solutions.
Highlights
Synthetic dyes are widely used in the textile industry
Preparation and characterizations of ZnAl-Layered double hydroxides (LDHs) In this work, the ZnAl-LDHs films were successfully synthesized on the aluminum plate by hydrothermal method at various temperatures ranging from 120, 150, 200 and 250 oC to study the effect of temperature on the preparation of ZnAl-LDHs films
ZnAl-LDH films were successfully prepared by the hydrothermal technique
Summary
The release of liquid effluent pollutants from the coloring process leads to high quantities of dye wastewater [1, 2] These colored effluents contain aromatic pollutants, making them non-biodegradable and carcinogenic for humans and the environment [3]. Various approaches have been developed to remove these pollutants in wastewater such as adsorption [4, 5], coagulation [6] and photocatalysis [7, 8]. Among these methods, adsorption is a suitable method to remove dye from the aqueous solution because it is an easy, fast, cheap and pollutantfree technique. Zinc-aluminum layer double hydroxide thin films (ZnAl-LDHs) grown on an aluminum plate were prepared via the hydrothermal method.
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