Fabrication of Zn(II) and Cu(II) supported metal-organic frameworks for removal of some 3d metals from aqueous solutions
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Remediation of copper(II) and zinc(II) ions with the aid of metal-organic frameworks (MOFs) from its respective aqueous media was carried out. The MOFs were prepared by a solvothermal synthesis procedure of copper and zinc with benzene 1,4-dicarboxylic acid (BDC). Resultant metal-organic frameworks characterization was done with the aid of X-ray diffraction (XRD), Fourier transform infrared spectrophotometry (FT-IR), energy-dispersive X-ray (EDS) spectroscopy, scanning electron microscopy (SEM), transmission electron micrograph (TEM) and pH point of zero charge (PZC). The adsorptive procedure employed to test the kinetics, equilibrium characters and thermodynamics was the batch process. Data obtained from the process were attested with the help of Temkin, Langmuir and Freundlich isotherm models; Langmuir model best fitted the data. Pseudo-first-order and pseudo-second-order rate equations were considered for kinetics. Results reveal that for copper; the metal-organic frameworks have an adsorptive capacity of 157.316 mg/g and 134.643 mg/g for Cu-BDC and Zn-BDC while the MOFs have an adsorption capacity of 145.144 mg/g and 138.158 mg/g for Cu-BDC and Zn-BDC when tested with zinc. The experimental data of the synthesized MOFs clearly indicates that they have great potential in remediating the subject metals in aqueous medium.
KeywordsAdsorption Copper Isotherm Kinetics Metal-organic frameworks Zinc
The authors, Dr. H. K. Okoro and Prof. J.C. Ngila, thank UJ Global Excellence and Stature Scholarship for the running cost paid through the Water Research Commission (WRC) Project No. K5/2365. They are also grateful to the Royal Society of Chemistry for awarding the 2015 research fund to them to facilitate the study. Dr. Caliphs Zvinowanda thanks NRF—SA/Egypt collaboration Grants No. 108685. The authors also thank the University of Ilorin, Ilorin, Nigeria, and the University of Johannesburg, South Africa, for making available their respective library database and laboratory facilities. Their acknowledgement also goes to Mr. Ismaila Jimoh, Psychometrics Department, JAMB, Nigeria, for the editorial assistance.
Compliance with ethical standards
Conflict of interest
All authors declare that they have no conflict of interest.
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