Flexible and mechanically-stable MIL-101(Cr)@PFs for efficient benzene vapor and CO<sub>2</sub>adsorption

Zhou, Zhenyu; Cheng, Baihua; Ma, Chao; Xu, Feng; Xiao, Jing; Xia, Qibin; Li, Zhong

doi:10.1039/c5ra17270e

Cited by 23 publications

(5 citation statements)

References 41 publications

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“…Figure compares the FTIR spectra for bare and amine-impregnated MIL-101 samples in both powder and monolith forms. The pristine MOF contains stretching vibrations at 3500, 1625, 1400, and 1100 cm –1 coinciding with literature band data. − The bands at 3500 and 1400 cm –1 are attributed to the O–H stretching vibration in the MOF’s hydrated Cr center whereas the peak at 1625 cm –1 is due to the C=C band in the terephthalate linker . The peak at 1100 cm –1 corresponds to the C–O bond in the MeOH used during the MOF activation process .…”

Section: Resultssupporting

confidence: 81%

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

et al. 2019

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Amine-functionalized metal−organic frameworks (MOFs) are facile adsorbents for CO 2 removal from enclosed environments. In this study, we prepared polyethylenimine (PEI) and tetraethylenepentamine (TEPA) impregnated MOFmonoliths using a 3D printing technique, through pre-and postfunctionalization approaches, and evaluated their CO 2 capture performances. For preimpregnation, the MIL-101 powder was impregnated with PEI or TEPA and printed to form the monoliths. Meanwhile, the postimpregnation technique directly printed the MOF powder and secondarily impregnated the monoliths with TEPA or PEI. The adsorption analysis results indicated that all impregnated monoliths showed improved CO 2 capacities from the pristine monolith at dilute concentrations, and preimpregnation yielded higher CO 2 uptakes than postimpregnation. Specifically, the preimpregnated TEPA and preimpregnated PEI monoliths, with 3.5 and 5.5 mmol N/g amine content, respectively, displayed a capture capacity of 1.6 and 1.4 mmol/g, respectively, at 3000 ppm and 25 °C. From CHN analysis, postimpregnation yielded ∼50 wt % less N content than preimpregnation which was attributed to reduced diffusion of aminopolymers into the MOF pores. This was further evidenced by the textural properties which showed nearly a 3fold increase in pore volume and a 2-fold increase in surface area for postimpregnation over preimpregnation. In turn, preimpregnated TEPA-MIL-101 exhibited the highest amine efficiency of 0.46 mmol CO 2 /mmol N. Furthermore, the TEPA grafting occurred during paste densification at 50 °C and resulted in the enhanced stability of TEPA-MIL-101 monoliths. Despite high adsorption capacity, the adsorptions kinetics were found to be relatively slow over 3D-printed amine-loaded MIL-101 monoliths, especially the preimpregnated monoliths, because the adsorption rate was limited by the CO 2 molecular diffusion into the monolith walls. Overall, this study establishes a route to formulate amine-MOF monoliths by a 3D printing technique; however, the monolith dimensions should be tuned to optimize adsorption kinetics.

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Section: Resultssupporting

confidence: 81%

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

et al. 2019

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“…The bands at 1630 cm -1 and 1398 cm -1 in MIL-101 and at 1632 cm -1 and 1394 cm -1 in CB6@MIL-101-Cl are attributed to the asymmetric ν as and symmetric ν s carboxylate (COO) stretching vibrations. 61,66 In both materials, after exposed once to SO 2 , the carboxylate ν as (COO) band is redshifted (Δ = -3 cm -1 ), and the ν s (COO) band is blue-shifted (Δ = 5 cm -1 for CB6@MIL-101-Cl and invariant within experimental error of 2 cm -1 for MIL-101).…”

Section: Nanoscale Accepted Manuscriptmentioning

confidence: 82%

Cucurbit[6]uril@MIL-101-Cl: loading polar porous cages in mesoporous stable host for enhanced SO₂ adsorption at low pressures

et al. 2021

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“…In order to increase the contact area between MOFs particles and gas molecules, Zhou et al. [ 114 ] fixed MIL‐101(Cr) on 100% virgin pulp fibers (PFs) to prepare MIL‐101(Cr)@PFs composite materials. The material shows excellent adsorption performance for benzene vapor, which can reach 10.29 mmol g –1 .…”

Section: Volatile Organic Compounds (Vocs)mentioning

confidence: 99%

“…Jhung et al [113] synthesized MIL-101 with a large specific surface area and a small pore size by microwave irradiation, this feature allows it to adsorb benzene quickly and in large quantities. In order to increase the contact area between MOFs particles and gas molecules, Zhou et al [114] fixed MIL-101(Cr) on 100% virgin pulp fibers (PFs) to prepare MIL-101(Cr)@PFs composite materials. The material shows excellent adsorption performance for benzene vapor, which can reach 10.29 mmol g -1 .…”

Section: Adsorption Analysis and Sensing Optimization Of Vocsmentioning

confidence: 99%

Metal–Organic Frameworks Materials for Capacitive Gas Sensors

Zhai

Zhang

Hao

et al. 2021

Adv Materials Technologies

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Table 1 summarizes the application of MOS and metal-organic frameworks (MOFs) materials to gas sensors. Although the method based on GC is accurate, it is costly, not easy to miniaturize, and involves a complicated sampling process. The nondispersive infrared gas sensor also has the shortcomings of high-test cost, long test cycle, and not easy to miniaturize. Therefore, it is necessary to study a new type of gas sensor, which can not only be miniaturized but also run at room temperature to reduce power consumption.Capacitive gas sensor as an electrical sensor achieves the sensing effect by changing the dielectric constant [4][5][6] or dielectric layer thickness [7] after absorbing the target molecule. The capacitance value of a capacitive sensor is generally independent of the electrode material, and some materials with a lower temperature coefficient can be selected as the electrode, so its temperature stability is superb. At the same time, capacitive sensors have the advantages of simple structure, easy manufacturing, high measurement accuracy, and miniaturization. [8][9][10][11] Therefore, capacitive sensors have fantastic advantages when applied to gas sensing. The materials used in capacitive gas sensors mainly include zeolites, [12,13] metal oxides, [14] and carbon nanotubes, [15] but some shortcomings including high working temperature, high cost, and difficult process also limit their further development. [16,17] Therefore, a material with higher selectivity is needed for capacitive gas sensors.MOFs are an emerging class of microporous/mesoporous crystal material that assembled by metal ions/clusters and organic ligands through coordination bonds. MOFs materials have ultrahigh porosity, large surface-to-volume ratio and flexible skeleton, widely explored in gas storage, [18,19] separation, [20] catalysis, [21,22] magnetism, [23] and sensor. [24,25] According to the different structures of MOF materials, it can be divided into the following categories: MIL series, ZIF series, UiO series, HKUST series, IRMOF series, and PCN series, etc. Among them, the MIL series, ZIF series, and UiO series are widely used in the field of gas sensing.The MIL series mainly composed of transition metals (Cr, Fe, V) or lanthanide metals, and the ligands are mainly dicarboxylic acids (terephthalic acid, succinic acid). The MIL series generally have excellent stability and ultra-high specific surface area, which has a positive effect on gas adsorption and sensing. The ZIF series has a 3D network structure similar to zeolite, Gas sensors have been widely used in detection of industrial gas leak, air quality detection, and medical diagnosis. Although some chemical sensors have been commercialized, there are still some challenges such as sensitivity, cycle stability, and high power consumption. Metal-organic frameworks (MOFs) have high specific surface area, rich porosity, and excellent reversible/selective adsorption ability for various gases. Therefore, MOFs has been considered as an ideal sensing material. Metal active sites and...

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Flexible and mechanically-stable MIL-101(Cr)@PFs for efficient benzene vapor and CO₂adsorption

Abstract: Novel MIL-101(Cr)@PF sheets with high uptakes for benzene and CO2(10.29 and 2.13 mmol g−1at 298 K, respectively) and excellent flexibility/mechanical stability were prepared by immobilizing MIL-101(Cr) crystals onto the modified pulp fibers (PFs).

Cited by 23 publications

References 41 publications

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

Cucurbit[6]uril@MIL-101-Cl: loading polar porous cages in mesoporous stable host for enhanced SO₂ adsorption at low pressures

Metal–Organic Frameworks Materials for Capacitive Gas Sensors

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Flexible and mechanically-stable MIL-101(Cr)@PFs for efficient benzene vapor and CO2adsorption

Abstract: Novel MIL-101(Cr)@PF sheets with high uptakes for benzene and CO2(10.29 and 2.13 mmol g−1at 298 K, respectively) and excellent flexibility/mechanical stability were prepared by immobilizing MIL-101(Cr) crystals onto the modified pulp fibers (PFs).

Cited by 23 publications

References 41 publications

Amine-Functionalized MIL-101 Monoliths for CO2 Removal from Enclosed Environments

Amine-Functionalized MIL-101 Monoliths for CO2 Removal from Enclosed Environments

Cucurbit[6]uril@MIL-101-Cl: loading polar porous cages in mesoporous stable host for enhanced SO2 adsorption at low pressures

Metal–Organic Frameworks Materials for Capacitive Gas Sensors

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Product

Resources

About

Flexible and mechanically-stable MIL-101(Cr)@PFs for efficient benzene vapor and CO₂adsorption

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

Cucurbit[6]uril@MIL-101-Cl: loading polar porous cages in mesoporous stable host for enhanced SO₂ adsorption at low pressures