Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems
Employing adsorption technology, metal organic frameworks (MOFs) are found promising to generate cooling, heating, and desalinated water with zero or negligible carbon footprint. In this article, we present various functional groups namely hydroxyl (-OH), amino (-NH2), nitro (-NO2), bromo (-Br) and...
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sg-ntu-dr.10356-1617692022-09-19T08:03:13Z Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems Han, Bo Chakraborty, Anutosh School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Adsorption Isotherms and Kinetics Employing adsorption technology, metal organic frameworks (MOFs) are found promising to generate cooling, heating, and desalinated water with zero or negligible carbon footprint. In this article, we present various functional groups namely hydroxyl (-OH), amino (-NH2), nitro (-NO2), bromo (-Br) and pyridine (-C5H5N) assisted MIL-125 (Ti) MOFs to control water adsorption/ desorption capacity under the working domain of adsorption heat transformation (A-HT) process. The MOFs are at first synthesized, and later these are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermo-gravimetric analyzer (TGA) and nitrogen (N2) adsorption techniques. The water adsorption isotherms and kinetics are measured by gravimetric methods. Using isotherms data in pressure-temperature coordinate system, the isosteric adsorption-heat (Qst) is evaluated. The experimental results show that the functional group not only influences the hydrophobic and hydrophilic behaviors of MIL-125 (Ti) MOFs but also controls the water transfer per adsorption-desorption cycle with variable uptake/offtake rates (kinetics). Employing isotherms and kinetics data of functionalized (MOFs + water) systems plus the thermodynamic modeling of A-HT cycle, the performance parameters such as cooling, heating and desalination capacities are estimated for various cycle times and heat inputs. The mass and heat transfer processes involved in each component of A-HT system are presented. It is found that OH-MIL-125 (Ti) provides 3 times faster kinetics as compared with the parent MIL-125 (Ti) MOFs. Hence the cooling/heating and water production of A-HT are improved significantly with the addition of functional group, and NH2-MIL-125 (Ti) shows the best cooling and water production performances. Ministry of Education (MOE) The authors acknowledge the financing support from Ministry of Education (MOE), Singapore (grant reference no. RG 98/17). 2022-09-19T08:03:13Z 2022-09-19T08:03:13Z 2022 Journal Article Han, B. & Chakraborty, A. (2022). Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems. International Journal of Heat and Mass Transfer, 186, 122473-. https://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.122473 0017-9310 https://hdl.handle.net/10356/161769 10.1016/j.ijheatmasstransfer.2021.122473 2-s2.0-85122494932 186 122473 en RG 98/17 International Journal of Heat and Mass Transfer © 2021 Elsevier Ltd. All rights reserved. |
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Engineering::Mechanical engineering Adsorption Isotherms and Kinetics Han, Bo Chakraborty, Anutosh Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems |
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Employing adsorption technology, metal organic frameworks (MOFs) are found promising to generate cooling, heating, and desalinated water with zero or negligible carbon footprint. In this article, we present various functional groups namely hydroxyl (-OH), amino (-NH2), nitro (-NO2), bromo (-Br) and pyridine (-C5H5N) assisted MIL-125 (Ti) MOFs to control water adsorption/ desorption capacity under the working domain of adsorption heat transformation (A-HT) process. The MOFs are at first synthesized, and later these are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermo-gravimetric analyzer (TGA) and nitrogen (N2) adsorption techniques. The water adsorption isotherms and kinetics are measured by gravimetric methods. Using isotherms data in pressure-temperature coordinate system, the isosteric adsorption-heat (Qst) is evaluated. The experimental results show that the functional group not only influences the hydrophobic and hydrophilic behaviors of MIL-125 (Ti) MOFs but also controls the water transfer per adsorption-desorption cycle with variable uptake/offtake rates (kinetics). Employing isotherms and kinetics data of functionalized (MOFs + water) systems plus the thermodynamic modeling of A-HT cycle, the performance parameters such as cooling, heating and desalination capacities are estimated for various cycle times and heat inputs. The mass and heat transfer processes involved in each component of A-HT system are presented. It is found that OH-MIL-125 (Ti) provides 3 times faster kinetics as compared with the parent MIL-125 (Ti) MOFs. Hence the cooling/heating and water production of A-HT are improved significantly with the addition of functional group, and NH2-MIL-125 (Ti) shows the best cooling and water production performances. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Han, Bo Chakraborty, Anutosh |
format |
Article |
author |
Han, Bo Chakraborty, Anutosh |
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Han, Bo |
title |
Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems |
title_short |
Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems |
title_full |
Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems |
title_fullStr |
Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems |
title_full_unstemmed |
Experimental investigation for water adsorption characteristics on functionalized MIL-125 (Ti) MOFs: enhanced water transfer and kinetics for heat transformation systems |
title_sort |
experimental investigation for water adsorption characteristics on functionalized mil-125 (ti) mofs: enhanced water transfer and kinetics for heat transformation systems |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/161769 |
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1745574630130712576 |