4-Aminoacetophenone Intercalated CoAl Layered Double Hydroxides: Synthesis, Characterization and Adsorptive Removal of Cd(II) Ions from Water Samples | [Pakistan Journal of Analytical & Environmental Chemistry • 2021]

Author(s):

1. Abdul Rafay Bhatti: Institute of Chemistry, University of Sindh, Jamshoro, Pakistan.

2. Ali Nawaz Siyal: Institute of Chemistry, University of Sindh, Jamshoro, Pakistan.

3. Qadeer Khan Panhwar: Institute of Chemistry, University of Sindh, Jamshoro, Pakistan.

4. Abdul Majid Channa: Institute of Chemistry, University of Sindh, Jamshoro, Pakistan.

5. Muhammad Hassan Agheem: Centre for Pure & Applied Geology, Sindh, Jamshoro 76080, Pakistan

6. Adnan Ahmed: Centre for Environmental Science, University of Sindh, Jamshoro, Pakistan

7. Muhammad Yar Khuhawar: Institute of Chemistry, University of Sindh, Jamshoro, Pakistan

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.

Page(s): 140-149

DOI: DOI not available

Published: Journal: Pakistan Journal of Analytical & Environmental Chemistry, Volume: 22, Issue: 1, Year: 2021

Keywords:

Adsorption , isotherms , CdII ions , Enolate ions , Intercalation , Layered Double Hydroxides

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