Postsynthetic Modification of Metal Organic Frameworks with Substituted Layered Double Hydroxides for Adsorption of Lead Ions
DOI: 10.23977/compne.2022.010101 | Downloads: 12 | Views: 450
C.Y. Abasi 1, E. B. AttahDaniel 2,3, F.M. Mtunzi 3, E.D. Dikio 1
1 Department of Chemical Sciences, Niger Delta University, Bayelsa State, Nigeria
2 Department of Chemical Sciences, Federal University Wukari, Taraba State, Nigeria
3 Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, P. O. Box X021, Vanderbijlpark, South Africa
Corresponding AuthorC.Y. Abasi
The effect of a two-pot postsynthetic modification of MOF with a modified LDH on the adsorption of Pb ions was investigated. Co-MOF was postsynthetically modified with an amino- silane substituted LDH and applied for the adsorption of Pb from aqueous solution. Synthetic and postsynthetic products were characterized by FTIR, PXRD and TGA/DTA. Blueshifts and redshifts of existing FT-IR bands in the PSM product in relation to that of the precursors confirmed the modification. PSM product was stable at temperatures up to 400ºC after a slight loss of surface water at low temperatures Adsorption capacity with respect to time at equilibrium was 34.58 mg/g, representing 87% of adsorbate uptake by the PSM Co-MOF. Equilibrium sorption data was better correlated by the Temkin model with a heat of sorption at 33.72 J/mol. Kinetic modelling was most favoured by the pseudo second order, and diffusion by film diffusion model.
KEYWORDSPostsynthetic, modification, adsorption, ex situ, characterisation, layered double hydroxide, metal organic framework, isotherms
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C.Y. Abasi, E. B. AttahDaniel, F.M. Mtunzi, E.D. Dikio, Postsynthetic Modification of Metal Organic Frameworks with Substituted Layered Double Hydroxides for Adsorption of Lead Ions. Composites and Nano Engineering (2022) Vol. 1: 1-15. DOI: http://dx.doi.org/10.23977/compne.2022.010101.
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