Adsorptive Separation of Fructose and Glucose by Metal–Organic Frameworks: Equilibrium, Kinetic, Thermodynamic, and Adsorption Mechanism Studies

Abstract

In this work, seven metal–organic frameworks [ZIF-8, MIL-53­(Cr), MIL-96­(Al), MIL-100­(Cr), MIL-100­(Fe), MIL-101­(Cr), and UiO-66 ] were applied for adsorptive separation of fructose–glucose mixture. UiO-66 exhibited better performance in adsorption capacity and selective adsorption of fructose. The adsorptive process with UiO-66 was further investigated in detail including kinetic, isotherm, and adsorption mechanisms. The rate-determining step analysis based on film diffusion and intraparticle diffusion model suggested that the adsorption process was controlled by multiple steps, which fitted the pseudo-second-order model. The Freundlich model was fitting better than the Langmuir model, which indicated multilayer adsorption on heterogeneous surface. The thermodynamic parameters (ΔG, ΔH, and Δ S ) were calculated, indicating that adsorption process on UiO-66 was an endothermic and entropy increment process. UiO-66 can be a promising adsorbent for adsorptive separation of fructose and glucose.

Insights into efficient removal and mechanism for ammonium from aqueous solution on tricalcium aluminate

“…To further investigate the influence of temperature on the removal of NH 4 + , the thermodynamic parameters (the Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°)) were calculated from the isotherm data (Table S2 & Figure S3, Supporting Information). These values are evaluated by the following equations [45] :…”

Performance enhancement strategies for surface plasmon resonance sensors in direct glucose detection using pristine and modified UiO-66: effects of morphology, immobilization technique, and signal amplification

“…Zeng et al showed that the glucose adsorption process by UiO-66 involves the interaction of the hydroxyl functional group (O-H) in UiO-66 with that in glucose through hydrogen bonding. 23 The hydrogen bonding involves van der Waals forces and is inuenced by the attractive dipole-dipole interactions. 84 In this work, the dipoles are the O-H groups of glucose and UiO-66.…”

“…21,22 For instance, Zeng et al compared the performance of ZIF-8 (Zn), UiO-66 (Zr), MIL-100 (Fe), MIL-96 (Al), MIL-101 (Cr), MIL-100 (Cr), and MIL-53 (Cr) to separate fructose and glucose. 23 They demonstrated the higher adsorption ability and selectivity of UiO-66 compared to these other MOFs towards fructose and glucose due to the increased presence of active O-H groups that could bind to the O-H group in glucose. UiO-66 is a metalorganic framework (MOF), which is composed of Zr as the metal center and 1,4-benzenedicarboxylate as the organic linker.…”

Separation and Purification of 2,5-Dimethylfuran: Process Design and Comparative Technoeconomic and Sustainability Evaluation of Simulated Moving Bed Adsorption and Conventional Distillation

“…Adsorptive separation is promising as a material-based route for energy-efficient liquid phase separation processes in biorefineries. Several adsorption processes have been investigated and demonstrated for the separation of sugars, 16 furfural, 17 HMF, 18 alcohols, 19−21 and organic acids. 22,23 Although the above processes are effective in recovering organic chemicals from (usually) aqueous phases, the separation of the organic molecules from each other is more challenging due to close physical properties.…”

“…Adsorptive separation is promising as a material-based route for energy-efficient liquid phase separation processes in biorefineries. Several adsorption processes have been investigated and demonstrated for the separation of sugars, furfural, HMF, alcohols, − and organic acids. , Although the above processes are effective in recovering organic chemicals from (usually) aqueous phases, the separation of the organic molecules from each other is more challenging due to close physical properties. This is a key issue in DMF purification from the organic mixture from the biphasic conversion process and requires microporous adsorbents that increase selectivity for adsorption of the desired species through more specific adsorbent–adsorbate interactions in pore spaces, which are ∼1 nm or smaller in dimension.…”