Kinetic modeling of novel solid desiccant based on PVA-LiCl electrospun nanofibrous membrane |
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| Institution: | 1. Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China;2. Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China;1. LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, 4051381 Concepción, Chile;2. Department of Mechanical Engineering, University of the Basque Country, 48013 Bilbao, Spain;1. Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Professora Eloisa Mano (IMA/UFRJ), Rio de Janeiro, RJ, Brazil;2. Universidade do Estado do Rio de Janeiro, Instituto de Química (IQ/UERJ), Rio de Janeiro, RJ, Brazil;3. Centro de Tecnologia Mineral (CETEM), Rio de Janeiro, RJ, Brazil;4. Universidade do Estado do Rio de Janeiro, Instituto Politécnico do Rio de Janeiro (IPRJ/UERJ), Nova Friburgo, RJ, Brazil;5. Centro de Pesquisa e Desenvolvimento Leopoldo Américo Miguez de Mello - CENPES/PETROBRAS, Rio de Janeiro, RJ, Brazil;6. Universidade Federal do Rio Grande do Sul, Instituto de Química (IQ/UFRGS), Porto Alegre, Rio de Grande do Sul, Brazil;7. Universidade Federal do Rio de Janeiro, Programa de Engenharia Ambiental, Escola Politécnica (PEA/UFRJ), Rio de Janeiro, RJ, Brazil |
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| Abstract: | A new polymer-based composite desiccant, Polyvinyl alcohol-LiCl nanofibrous membrane (PVA-LiCl NFM), has been prepared by the electrospinning technique. The newly-developed desiccant membrane not only has large moisture adsorption capacity, fast moisture adsorption rate and favorable stability, but also is featured by its low regeneration temperature. In this work, adsorption and desorption kinetic models are explored for PVA-LiCl NFMs, which include the pseudo-first and the pseudo-second order model based on the rate law and a diffusion model based on the Fick's law. The results indicate that the moisture adsorption and desorption kinetics of the PVA-LiCl NFMs follow the pseudo-second-order law very well. As the key parameters in the diffusion model, the equilibrium adsorption capacity and the diffusion coefficient are focused on, and they can be well determined by the Brunauer–Emmett–Teller (BET) model and the radial-basis-functions artificial neural network (RBFANN) model, respectively. Finally, the adsorption and desorption activation energy of the PVA-LiCl NFM with a 0.15 mass ratio of LiCl to PVA are recognized as 24.36 and 26.52 kJ/mol, respectively. The work is of great importance to the better application of the newly-developed desiccant material (PVA-LiCl NFM). |
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| Keywords: | Diffusion model Electronspun Nanofibrous membrane (NFM) Polyvinyl alcohol-LiCl Pseudo-first order model Pseudo-second order model |
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