Adsorption isotherms and kinetics of water vapor on novel adsorbents MIL-101(Cr)@GO with super-high capacity

Yan, Jia; Ying, Yu; Ma, Chao; Xiao, Jing; Xia, Qibin; Li, Yingwei; Li, Zhong

doi:10.1016/j.applthermaleng.2015.03.040

Cited by 139 publications

(103 citation statements)

References 46 publications

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“…A steep increase in N 2 adsorption at high relative pressures (P/P 0 > 0.9) was observed with large hysteresis loops for MOHC/GO composites as shown in Figure S3, which is probably originated from nanophase or presence of meso/macro pores due to interstitial voids between particles. It is believed that some meso pores can be generated at the interfaces between GO layers and MIL-101(Cr) cages30. Thus, the amount of meso pores depends on the amount of GO/AGO in the composites, which results in some changes in the pore size distributions with an increase in GO/AGO content as shown in Figure S4.…”

Section: Resultsmentioning

confidence: 99%

“…Specifically, MOF-5/graphite composites have shown a significant enhancement in the thermal conductivity up to 0.56 W.m −1 .K −1 compared with that of the intrinsic MOF-5 (0.10 W.m −1 .K −1 )2324. Due to these improved properties, MOF/GO composites have been synthesized by various methods and used for a wide range of applications including gas adsorption212526272829, water adsorption30, CO 2 /CH 4 separation31, catalysis32333435, electrochemical sensing36, liquid-phase adsorption3738, and energy storage3940. In our previous studies, stable MOHCs with neat MIL-101(Cr) nanoparticles have been easily synthesized using water by a simple hydrothermal method13.…”

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confidence: 99%

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Increased Thermal Conductivity in Metal-Organic Heat Carrier Nanofluids

Nandasiri

Liu

McGrail

et al. 2016

Sci Rep

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Metal-organic heat carriers (MOHCs) are recently developed nanofluids containing metal-organic framework (MOF) nanoparticles dispersed in various base fluids including refrigerants (R245Fa) and methanol. Here, we report the synthesis and characterization of MOHCs containing nanoMIL-101(Cr) and graphene oxide (GO) in an effort to improve the thermo-physical properties of various base fluids. MOHC/GO nanocomposites showed enhanced surface area, porosity, and nitrogen adsorption compared with the intrinsic nanoMIL-101(Cr) and the properties depended on the amount of GO added. MIL-101(Cr)/GO in methanol exhibited a significant increase in the thermal conductivity (by approximately 50%) relative to that of the intrinsic nanoMIL-101(Cr) in methanol. The thermal conductivity of the base fluid (methanol) was increased by about 20%. The increase in the thermal conductivity of nanoMIL-101(Cr) MOHCs due to GO functionalization is explained using a classical Maxwell model.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Increased Thermal Conductivity in Metal-Organic Heat Carrier Nanofluids

Nandasiri

Liu

McGrail

et al. 2016

Sci Rep

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“…A comparison between the water adsorption capacity of MIL-101(Cr) and a composite of MIL-101(Cr) and graphite oxide showed that the exceptional water uptake of 1.22 gH2O gads −1 was increased further to reach 1.58 gH2O gads −1 for the 6% GO composite [26]. However, these exceptional properties of MOFs come with the price of extremely low thermal conductivity due to their large pore sizes and high free volumes.…”

Section: Kumar Et Almentioning

confidence: 99%

“…This may be attributed to the fact that GrO is non-porous material and may cause pore blocking, and thus it will lower the accessible surface area and pore volume of the composites if more GrO is incorporated into MIL-101(Cr). As a result, it cannot improve the water vapour capacity of a composite any further [26].…”

Section: Nitrogen Adsorption Isotherms and Bet Surface Areamentioning

confidence: 99%

Development of MIL-101(Cr)/GrO composites for adsorption heat pump applications

Elsayed

Wang

Anderson

et al. 2017

Microporous and Mesoporous Materials

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Adsorption heat pumps can be used for generating heating, cooling, seasonal energy storage and water desalination applications. Metal-organic frameworks (MOFs) are hybrid porous materials with high surface area and superior adsorption characteristics compared to conventional adsorbents. MIL-101(Cr) has a large pore size with water vapour adsorption capacity up to 1.5 gH2O gads -1 and high cyclic stability thus has the potential to be used in adsorption heat pumps. This work investigates the enhancement of the thermal conductivity and water adsorption characteristics of MIL-101(Cr) using hydrophilic graphene oxide. Two methods have been used to develop MIL-101(Cr)/GrO composites. The first method was through physical mixing between MIL-101(Cr) and GrO while the other was through incorporating the GrO during the synthesis process of MIL-101(Cr). The composites and MIL-101(Cr) were characterized in terms of their structure, water adsorption uptake, BET surface area, particle size, thermal gravimetric analysis, SEM images and thermal conductivity measurements. Results showed that introducing low amounts of GrO (<2%) to the neat MIL-101(Cr) enhanced the water adsorption characteristics at high relative pressure but enhanced the heat transfer properties by 20-30% while using more than 2% of GrO reduced the water adsorption uptake but significantly enhanced the thermal conductivity by more than 2.5 times.

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“…On the other hand, although a few of MOFs such as MIL-101(Cr) with thermodynamically stable property has not only high moisture stability but also high CO 2 capacity [16,23], its high hydrophilicity resulted in sharp decrease in its CO 2 uptake in humid atmosphere [24]. The reason may be that the unsaturated metal centers (UMCs) of these MOFs like MOL-101(Cr) have strong selectivity for CO 2 in presence of other gases, and meanwhile, these UMCs are very hydrophilic [25][26][27], which would promote competitive adsorption of water vapor [24,28]. Therefore, developing novel adsorbents with high CO 2 capacity and moisture resistance performance or vapor-enhanced CO 2 adsorption function is crucial.…”

Section: Introductionmentioning

confidence: 98%