Abstract
This study explored the adsorption capacity of Mg/Al layered double hydroxide (LDH) for the removal of Cu2+ from aqueous solutions after synthesis and characterization. The effect of various operational parameters such as concentration, temperature and sorption time on the adsorption of Cu2+ was investigated using batch adsorption process experiments. It was found that layered double hydroxide (LDH) can be used as adsorbent for the removal of copper ions in aqueous solution containing low concentration of the metal salt. The average values of activation energy, isosteric heat of adsorption, entropy and enthalpy were 1.447, 12.9, 0.0137 and ?4.8390 kJ/mol, respectively. This shows that the adsorption of the metal ion on the adsorbent follows a physical adsorption mechanism. The kinetic results conform to pseudo-second order model (R2 = 0.9959) and second order kinetic model (R2 = 0.9952) while the adsorption characteristics of the adsorbent followed both Langmuir and Freundlich adsorption isotherm models.
Highlights
This study explored the adsorption capacity of Mg/Al layered double hydroxide (LDH) for the removal of Cu2+ from aqueous solutions after synthesis and characterization
The structure of LDH forms two-dimensional crystals consisting of thin crystalline layers stacked by van der Waals and/or weak electrostatic interaction; various guest anions can be inserted into the LDH interlayer galleries [17]
The powdered layered double hydroxide was characterized by Powder X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR) and EDX/TEM analysis
Summary
Layered nanomaterials are getting lots of attention due to their unique structural flexibility, which is useful for the development of new hybrid materials with controlled functionality [11]. The x value is the charge density for the mole ratio M3+/(M2++M3+) [19] The monovalent anions such as NO3– and Cl– within the interlayer gallery space can be replaced by desired anions [20]. The structure of LDH forms two-dimensional crystals consisting of thin crystalline layers stacked by van der Waals and/or weak electrostatic interaction; various guest anions can be inserted into the LDH interlayer galleries [17]. This material is two dimensional type layered structure consisting of thin crystalline layers with a thickness of a few nanometers [21]. This work investigated the direct application of the LDH for the removal of Cu2+ without further intercalation
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