Synergistic effect of modified activated carbon and ionic liquid in the conversion of microcrystalline cellulose to 5-Hydroxymethyl Furfural

Tyagi, Uplabdhi; Anand, Neeru; Kumar, Dinesh

doi:10.1016/j.biortech.2018.07.035

Cited by 52 publications

(30 citation statements)

References 41 publications

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“…It is obvious that the qmax value of HNTs is much higher than kaolinite (6.99 mg/g), aluminum hydrous oxide (14.72 mg/g), and even modified coal fly ash (1.547 mg/g), but still lower than montmorillonite and bentonite. Moreover, this value is much lower than activated carbon and other modified adsorbents, because larger specific surface area and modification are favorable for improving the adsorption capacity [39,40]. Table S1 displays the q max values of HNTs and other clays toward CIP.…”

Section: Adsorption Characteristics Of Hnts Toward Cipmentioning

confidence: 99%

Halloysite Nanotubes as an Effective and Recyclable Adsorbent for Removal of Low-Concentration Antibiotics Ciprofloxacin

Cheng

Liu

et al. 2018

Minerals

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In this work, halloysite nanotubes (HNTs) without modification were used as an efficient adsorbent to explore its natural adsorption capability, which showed excellent adsorption ability for low-concentration ciprofloxacin (CIP). The physicochemical properties of HNTs before and after adsorption were investigated by several characterization techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), N 2 adsorption-desorption analysis, X-ray diffractometer (XRD), and zeta potential analysis. The influences of temperature, initial CIP concentration, adsorbent dosage, and pH value on CIP adsorption performance were also studied. The kinetics analysis revealed that CIP adsorption on HNTs was a kind of monolayer adsorption process and followed a pseudo-second-order rate equation. The zeta potential result indicated that electrostatic interaction between HNTs and CIP molecules was possibly responsible for the adsorption performance. Moreover, HNTs showed no apparent loss in CIP adsorption capability after five cycles, exhibiting potential applications in wastewater treatment. excellent adsorption characteristics is widely used as an adsorbent. However, its high cost restricts its commercial application. In contrast to active carbon, clays are considered to be promising adsorbent candidates because of their lost cost, wide availability, and high adsorption efficiency [14].Halloysite [Al 2 Si 2 O 5 (OH) 4 ·2H 2 O], a type of natural aluminosilicate clay mineral that is widely widespread in China [15], has a similar structure to kaolin, except that a monolayer of water molecules intercalates between the adjacent clay layers [16]. The sizes and polydispersity of halloysite depends on the specific geological deposit [17]. Halloysite nanotubes (HNTs) with negative charges on outer surface are a kind of outstanding hollow tubular material with an internal diameter of 20-30 nm and an external diameter from 30 to 70 nm [18,19], which exhibits excellent physical and chemical properties due to their large specific surface areas, abundant hydroxyl groups, porous structure, and great biocompatibility. HNTs are not toxic to humans [20,21], which represents a prerequisite for pharmaceutical and biomedical applications [22,23]. Most importantly, HNTs have been widely investigated as adsorbents for the removal of dyes and heavy metals in wastewater [24][25][26].Herein, we used HNTs without any modification as adsorbent to investigate its natural adsorption performance toward CIP. The effects of various experiment conditions on adsorption capacity were thoroughly investigated, and pH value played an important role in regulating the adsorption efficiency. Furthermore, the adsorption kinetics and adsorption characteristics were discussed. The pseudo-second-order kinetic model fitted the data well and the equilibrium adsorption data were well described by the Langmuir isotherm model. It was found that the structure and surface property of HNTs were the k...

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Section: Adsorption Characteristics Of Hnts Toward Cipmentioning

confidence: 99%

Halloysite Nanotubes as an Effective and Recyclable Adsorbent for Removal of Low-Concentration Antibiotics Ciprofloxacin

Cheng

Liu

et al. 2018

Minerals

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“…However, both studies produced low HMF yields: 10%, at 130 °C in 8 hours; and < 5%, at 125 °C in 3 hours, respectively. Meanwhile, Tyagi et al combined Brønsted and Lewis acid sites in the same carbon catalyst by impregnating metals into sulfuric acid-treated activated carbon [41]. These researchers were able to produce a 49% HMF yield using cellulose as feedstock and an ionic liquid as a reaction medium.…”

Section: Introductionmentioning

confidence: 99%

Catalytic conversion of glucose to 5-hydroxymethylfurfural over biomass-based activated carbon catalyst

et al. 2020

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Highlights  Biomass-based activated carbon catalysts modified with Lewis or Brønsted acid sites were prepared  Catalysts were used to convert glucose to HMF in biphasic water:THF system  51% HMF yield was obtained with catalytic mixture containing both Lewis and Brønsted acid sites  The water phase containing the catalyst was recycled successfully Abstract Selective and efficient dehydration of glucose to 5-hydroxymethylfurfural (HMF) has been widely explored research problem recently, especially from the perspective of more sustainable heterogeneous catalysts. In this study, activated carbon was first produced from a lignocellulosic waste material, birch sawdust. Novel heterogeneous catalysts were then prepared from activated carbon by adding Lewis or Brønsted acid sites on the carbon surface. Prepared catalysts were used to convert glucose to HMF in biphasic water:THF system at 160 °C. The highest HMF yield and selectivity, 51% and 78%, respectively, were obtained in 8 hours with a catalytic mixture containing both Lewis and Brønsted acid sites. Also, preliminary recycling experiments were performed. Based on this study, biomass-based activated carbon catalysts show promise for the conversion of glucose to HMF.

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“…The observed exponential growth of worldwide energy demands and concurrent depleting of fossil fuel reserves has spurred worldwide research efforts towards the energy effective and environmentally friendly production of chemicals. According to the U.S. Department of Energy, 5‐hydroxymethylfurfural (5‐HMF) is one of the top 10 most valuable biomass‐derived feedstocks, and is used as a versatile intermediate for the synthesis of a wide range of value‐added compounds such as 2,5‐furandicarboxylic acid, 2,5‐dimethylfuran, 2,5‐hydroxymethyl‐furan, levulinic acid, caprolactam and caprolactone . Generally, various polysaccharides and monosaccharides are used as the starting materials, for the synthesis of 5‐HMF.…”

Section: Introductionmentioning

confidence: 99%

“…According to the U.S. Department of Energy, [1][2][3] 5-hydroxymethylfurfural (5-HMF) is one of the top 10 most valuable biomass-derived feedstocks, and is used as a versatile intermediate for the synthesis of a wide range of value-added compounds such as 2,5-furandicarboxylic acid, 2,5-dimethylfuran, 2,5-hydroxymethyl-furan, levulinic acid, caprolactam and caprolactone. [4][5][6][7][8][9][10] Generally, various polysaccharides and monosaccharides are used as the starting materials [11,12] for the synthesis of 5-HMF. Environmental and safety considerations highlight the requirement of replacing the mineral acids by environmentally-benign solid acid catalysts.…”

Section: Introductionmentioning

confidence: 99%

Self‐Organization of Ionic Liquid‐Modified Organosilica Hollow Nanospheres and Heteropolyacids: Efficient Preparation of 5‐HMF Under Mild Conditions

Wang

Miras

et al. 2019

ChemCatChem

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As a biomass‐derived platform molecule, 5‐hydroxymethylfurfural (5‐HMF) is a highly desirable feedstock for manufacturing of high value‐added chemicals ranging from starting materials for polyesters to biofuels. In this work, we reported the fabrication of a series of multicomponent solid acid catalysts based on heteropolyacids immobilized ILs‐modified organosilica hollow nanospheres (denoted as PW12‐ILs‐Cn‐HNS), in which PW12 (PW12=H3PW12O40 ⋅ xH2O) provides Brønsted acid site, ILs show strong electrostatic interactions with PW12, Cn (Cn=alkyl chain) is attached for hydrophobicity and HNS represents organosilica hollow nanospheres. When applied for catalytic dehydration of fructose to 5‐HMF, the PW12‐ILs‐C4‐HNS catalyst with 15.2 % PW12 loading exhibited the best dehydration activity to 5‐HMF with 93.7 % yield in DMSO at 100 °C in 2 h. Compared with 2D hexagonal and 3D interconnected structures, the excellent porosity properties of hollow nanospherical structure can provide a high population of the PW12 sites and enough confined nanospace for the dehydration of fructose. Moreover, the PW12‐ILs‐Cn‐HNS catalyst showed excellent stability over six catalytic cycles without obvious loss of activity. Most importantly, careful identification of the observed intermediates revealed crucial information for the dehydration process of fructose to 5‐HMF. As such, the proposed heterogeneous catalysts show great potential in biomass conversion processes.

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Synergistic effect of modified activated carbon and ionic liquid in the conversion of microcrystalline cellulose to 5-Hydroxymethyl Furfural

Cited by 52 publications

References 41 publications

Halloysite Nanotubes as an Effective and Recyclable Adsorbent for Removal of Low-Concentration Antibiotics Ciprofloxacin

Halloysite Nanotubes as an Effective and Recyclable Adsorbent for Removal of Low-Concentration Antibiotics Ciprofloxacin

Catalytic conversion of glucose to 5-hydroxymethylfurfural over biomass-based activated carbon catalyst

Self‐Organization of Ionic Liquid‐Modified Organosilica Hollow Nanospheres and Heteropolyacids: Efficient Preparation of 5‐HMF Under Mild Conditions

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