4-Aminoacetophenone Intercalated CoAl Layered Double Hydroxides: Synthesis, Characterization and Adsorptive Removal of Cd(II) ions from Water Samples
Abstract
In the present study, CoAl-NO3 Layered Double Hydroxides (CoAl-NO3-LDH) was synthesized
and an enolate anion of 4-Aminoacetophenone (AAP) was intercalated into LDH following the
reconstruction approach. The CoAl-NO3-LDH and CoAl-AAP-LDH were characterized by
Fourier-Transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron
microscope (SEM) and energy dispersive X-ray (EDX) analyses. CoAl-AAP-LDH worked well
for adsorption of Cd(II) ions from aqueous samples at optimum pH 7, adsorbent dosage 25 mg,
concentration of Cd(II) ions 25 mg L-1 and shaking time 20 min at 25 °C. Different isotherms such
as Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms fitted well to adsorption
data with correlation coefficient (R2) of 0.998, 0.982 and 0.992, respectively. Monolayered (Qm)
and multi-layered (KF) capacities of CoAl-AAP-LDH for adsorption of Cd(II) ions were
calculated and found to be 34.40 and 19.44 mg g-1, respectively. Sorption energy was calculated
and found to be 9.13 kJ mol-1, indicating chemisorption or ion exchange sorption mechanism. The
method worked well for the adsorption of Cd(II) ions from wastewater samples.
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