Synthesis and crystal structure of Cd-based metal-organic framework for removal of methyl-orange from aqueous solution
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Date
2017-07-21
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
A novel [Cd(INA)2(H2O)]. ISB (1) (INA = isonicotinate; ISB = isobutanol) was synthesized through the reaction
between the isonicotinic acid ligand and cadmium (II) salt and characterized by elemental analysis, FTIR and
UV–Visible spectroscopies, SEM and Single crystal X-ray diffraction. The crystal is orthorhombic, space group
Pbca, a = 12.24(10) Å, b = 15.4646(13) Å, c = 18.8445(17) Å, V = 3569(3) Å3, Z = 8. The pentagonal bipyramid
(seven coordinate) around the cadmium (II) ion is of the form CdN2O5 coordinating to four oxygen atoms from
carboxylates, one oxygen atom from water molecule and two nitrogen atoms of pyridine. The structure of
compound is stabilized by two hydrogen bonds namely intermolecular (O-H–O) and intramolecular type C-H–
O accounting for polymeric nature of the metal-organic frameworks. 1 was studied for adsorptive removal of
methyl orange (MO) from aqueous solution. Equilibrium isotherm study reveals that Langmuir model gave a
better fitting result than the Freundlich model. The pseudo-second order model could be used to interpret
adsorption kinetics. The maximum adsorption capacity calculated by Langmuir was 166 mg/g at 300 K. These
results indicate the adsorption of MO on 1 is partly due to electrostatic interaction between methyl orange and
the adsorbent. 1 could be used as adsorbent to remove methyl orange from aqueous solution.
Description
Staff Publication
Keywords
MOFs, Adsorption, Methyl orange, X-ray crystallography
Citation
Tella, A. C., Olawale, M. D., Neuburger, M., & Obaleye, J. A. (2017). Synthesis and crystal structure of Cd-based metal-organic framework for removal of methyl-orange from aqueous solution. Journal of Solid State Chemistry, 255, 157–166. doi:10.1016/j.jssc.2017.07.019