Equilibrium and Kinetic Study of l- and d-Valine Adsorption in Supramolecular-Templated Chiral Mesoporous Materials

Abstract

Adsorption kinetic studies are conducted to investigate the potential to use chiral mesoporous materials nanoporous guanosine monophosphate material-1 (NGM-1) and nanoporous folic acid material-1 (NFM-1) for the enantiomeric separation of l- and d-valine. A pseudo-second-order (PSO) kinetic model is applied to test the experimental adsorption equilibrium isotherms, according to both the Langmuir and Freundlich models and the characteristic parameters for each model are determined. The calcined versions of both NGM-1 and NFM-1 fit the Langmuir model with maximum sorption capacities of 0.36 and 0.26 g/g for the preferred adsorption enantiomers, d-valine and l-valine, respectively. Experimental results and the analysis of adsorption models suggest a strong adsorbate–adsorbent interaction, and the formation of a monolayer of tightly packed amino acid on the internal mesopore surface for the preferred enantiomers.

Two step synthesis and application of porous carbon for removal of copper (II) from wastewater: Statistical optimization and equilibrium isotherm analysis

“…The suitability of the model was checked by estimating the values of R 2 along with some model constants. An adsorption system is better represented by a model; with an R 2 value near to unity (Adebesi et al 2017b;Huang and Garcia-Bennett 2021).…”

Wireless Hollow Miniaturized Objects for Electroassisted Chiral Resolution

“…For example, microfluidic systems or photoinduced methods have been used for the physical separation of chiral substances. , Furthermore, Naaman et al evaluated the influence of an external magnetic field on the chiral resolution of oligopeptides, oligonucleotides, and amino acids, , which is based on the enantiospecific differences in the adsorption rates of the antipodes on the surface of a ferromagnetic material, as a function of the magnetic field orientation . Alternatively, several efforts have been made to design new enantioselective materials, such as mesostructured heteromembranes, − functionalized graphene sheets, , or two-dimensional porous metal–organic frameworks, − allowing the propagation of only one enantiomer through the pores. More recently, electroassisted enantioselective separation has been achieved by using imprinted metallic surfaces and metallic organic frameworks encoded with chiral information. , In both cases, the enantioaffinities of these so-called chiral surfaces are modulated by imposing an electric potential.…”