Selective Liquid Phase Adsorption of Biogenic HMF on Hydrophobic Spherical Activated Carbons

Schute, Kai; Louven, Yannik; Detoni, Chaline; Rose, Marcus

doi:10.1002/cite.201500133

Cited by 17 publications

(6 citation statements)

References 24 publications

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“…In the adsorption breakthrough experiment, MAF-5 shows strong adsorption selectivity with Fur/5-HMF, prompting us to adopt a suitable method to desorb and recover Fur. After the adsorption breakthrough experiment, we injected ethanol into the packed column at 40 °C at a flow rate of 0.05 mL min –1 to recover Fur. , In the desorption curves of MAF-6, a sharp roll-up of 5-HMF was observed. In the desorption curves of MAF-5, 5-HMF was hardly detected and the recovery rate of Fur reached 93.5%, demonstrating the excellent performance of MAF-5 for the recovery of Fur from dilute binary-component Fur and 5-HMF aqueous solutions.…”

Section: Results and Discussionmentioning

confidence: 99%

Adsorptive Separation of Furfural/5-Hydroxymethylfurfural in MAF-5 with Ellipsoidal Pores

Zhao

Wang

et al. 2020

Ind. Eng. Chem. Res.

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The objective of this work is to study the adsorptive separation of the biomass-derived furfural (Fur) and 5-hydroxymethylfurfural (5-HMF). Because Fur and 5-HMF have similar ellipsoidal shapes, the diffusion of the larger 5-HMF may be blocked by the elliptical window of adsorbents. Thus, two zeolitic imidazolate framework (ZIF) materials with the identical chemical composition, MAF-6 and MAF-5, were used as spherical and ellipsoidal pore adsorbents, respectively. In the dynamic column adsorption of a binary-component system (Fur/5-HMF, 5/5 wt %) in an aqueous solution, the adsorption amounts of Fur on MAF-6 display a 13% decrease compared with the single-component system, whereas the adsorption amounts of Fur on MAF-5 are identical to those obtained in the single-component system and the amounts of adsorbed 5-HMF are almost negligible. Thus, the Fur/5-HMF selectivity is only 6.4 for MAF-6, whereas the selectivity reached 115.8 for MAF-5. The results show that the narrow elliptical window/ellipsoidal tile of MAF-5 enhanced separation selectivity compared with the larger circular window/spherical cage of MAF-6. In addition, the general rate model and density functional theory calculations further verify that the elliptical window of MAF-5 exhibits a strong mass-transfer barrier that must be overcome for the diffusion of the larger 5-HMF molecules.

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Section: Results and Discussionmentioning

confidence: 99%

Adsorptive Separation of Furfural/5-Hydroxymethylfurfural in MAF-5 with Ellipsoidal Pores

Zhao

Wang

et al. 2020

Ind. Eng. Chem. Res.

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“…The order of magnitude of this observed adsorption enthalpy is typical for physisorption (permanent dipoles, induced dipoles, hydrogen bonds) . Although the temperature dependency can be very pronounced, there are a limited number of systematic investigations for pesticides, pharmaceuticals, personal care products, and other organics. − ,,,,− The number is probably limited because of the relatively high experimental, analytical, and temporal effort for noncalorimetric measurements. The reported and recalculated (using equation S18) adsorption enthalpies Δ H 0 range from −52 to 117 kJ mol –1 with the majority (57 of 83) being of exothermic and thus “TSA-feasible” nature.…”

Section: Resultsmentioning

confidence: 99%

“…Apparently endothermic adsorption may arise from enthalpic 52 and entropic contributions 64 in the interplay of compound, solvent, and adsorbent. Also steric hindrance 52 and incomplete wetting 55 have been suggested. At this stage, it remains to elucidate the dominant influencing factors and basic structural properties.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Aqueous-Phase Temperature Swing Adsorption for Pesticide Removal

Aumeier

Dang

Ohs

et al. 2018

Environ. Sci. Technol.

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Recently, activated carbon adsorption for water treatment regained substantial attention due to the emerging task to remove trace organic compounds such as pesticides. In many applications, especially in decentralized water treatment, one major drawback of adsorbents is their limited recyclability due to inadequate logistics or uneconomical reactivation. In this lab-scale study, we present the temperature swing adsorption in the aqueous phase that allows the in situ regeneration of fixed-bed adsorbers, and prove its technical feasibility. Complying with circular water economy principles, we eliminated the pivotal need for regular replacement and consumables by employing only clean water instead of dedicated regeneration solutions. Adsorption of the herbicide amitrole in aqueous solution on granular activated carbon was exothermic (ΔH = −14.4 ± 3.2 kJ mol −1 for T = 20− 94 °C) and followed the Freundlich model. The proposed method consisting of a short counterflow flush with liquid water at 125 °C effectively regenerated the adsorbent. Hence, we obtained a cyclic steady state operation with breakthrough after 122 ± 14 bed volumes (at c out /c in = 0.2), cycle-average rejection of 90 ± 1%, and water recovery of up to 78 ± 4%. No thermal aging of adsorbent was observed over the investigated 17 cycles.

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“…They possess high specific surface areas exceeding 2000 m 2 g −1 , high porosity with a broad pore size distribution and a very non‐polar surface. One example comprehends the adsorption of 5‐hydroxymethylfurfural from aqueous streams containing fructose together with levulinic and formic acid according to a reaction solution resulting from fructose dehydration , . A high adsorption capacity in combination with an improved selectivity for the adsorption of HMF versus fructose became evident for HCP compared to conventional adsorbents such as zeolites and activated carbons.…”

Section: Biomass As Renewable Resourcementioning

confidence: 99%

Sustainable Carbon Sources and Renewable Energy: Challenges and Opportunities at the Interface of Catalysis and Reaction Engineering

Palkovits

2018

Chemie Ingenieur Technik

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Limited fossil resources and the need to reduce greenhouse gas emissions require the development of environmentally benign production processes. Economic, energy and carbon‐efficient value chains based on lignocellulosic biomass are essential for a sustainable and potentially CO2‐neutral chemical industry. Biomass presents a concentrated renewable carbon source for base and fine chemicals, polymers and liquid fuels of high energy density. Research studies have highlighted the need for novel process concepts to account for the high degree of functionality of lignocellulosic biomass. Major challenges include selective deoxygenation of the highly functionalized starting materials, energy‐intensive separation and processes bridging chemo‐catalysis, biotechnology and electro‐catalysis. In the following, these challenges are exemplarily discussed. The showcases are selected to illustrate concepts and not meant to provide a comprehensive overview of the field.

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Selective Liquid Phase Adsorption of Biogenic HMF on Hydrophobic Spherical Activated Carbons

Cited by 17 publications

References 24 publications

Adsorptive Separation of Furfural/5-Hydroxymethylfurfural in MAF-5 with Ellipsoidal Pores

Adsorptive Separation of Furfural/5-Hydroxymethylfurfural in MAF-5 with Ellipsoidal Pores

Aqueous-Phase Temperature Swing Adsorption for Pesticide Removal

Sustainable Carbon Sources and Renewable Energy: Challenges and Opportunities at the Interface of Catalysis and Reaction Engineering

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