Renewable Chemicals: Production or Purification by Adsorption Process

Abstract

Biomass and renewable raw materials have received considerable attention as alternatives to fossil resources for energy generation and as starting materials for industrial chemistry due to economic, political, and environmental concerns. The so-called sugar platforms where biomass are hydrolyzed into sugars, and then translated into various products such as functional food (fructooligosaccharide), biofuel (ethanol), and valuable platform chemical (5-hydroxymethylfurfural) are on the upgrade. The production and purification of these valuable materials are discussed heatedly recently. In this article, the recent progress of the adsorption technologies utilized in this area is reviewed.

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

“…All the seven MOFs exhibited good adsorption capacity toward two saccharides (Figure ). Specifically, ZIF-8, UiO-66, and MIL-100 (Fe) showed a fructose preference and exhibited higher selectivity factor than many previously reported adsorbents . Some of the reported adsorbents with good adsorption performance are shown in Table S1.…”

“…Although MIL-96­(Al) showed better selectivity between fructose and glucose, low adsorption capacity limited its application in industry. Even though separation factor of UiO-66 (3.5) is not as good as those of ZIF-8, MIL-100­(Fe), and MIL-96­(Al), it is clear that UiO-66 outperformed other materials by balancing high selectivity factor and adsorption capacity (25.5 mg·g –1 adsorption capacity on fructose) . In addition, 12-connected Zr-MOF UiO-66 has outstanding rigidity and stability, which makes UiO-66 promising for industrial application.…”

“…Specifically, ZIF-8, UiO-66, and MIL-100 (Fe) showed a fructose preference and exhibited higher selectivity factor than many previously reported adsorbents. 46 Some of the reported adsorbents with good adsorption performance are shown in Table S1. Even though an ion-exchange resin Dowex Monosphere 99/Ca has shown better adsorption capacity (289.7 mg•g −1 ), UiO-66 has higher selectivity factor 3.5, while selectivity factor of Dowex Monosphere 99/Ca is 2.14.…”

“…Even though separation factor of UiO-66 (3.5) is not as good as those of ZIF-8, MIL-100(Fe), and MIL-96(Al), it is clear that UiO-66 outperformed other materials by balancing high selectivity factor and adsorption capacity (25.5 mg•g −1 adsorption capacity on fructose). 46 In addition, 12-connected Zr-MOF UiO-66 has outstanding rigidity and stability, which makes UiO-66 promising for industrial application. According to this analysis, further studies on adsorption of fructose and glucose on UiO-66 were conducted including kinetics, isotherms, thermodynamics, and mechanism.…”