CO2 absorption enhancement by water-based nanofluids of CNT and SiO2 using hollow-fiber membrane contactor
| Autor: | Mashallah Rezakazemi, Mohammad Mesbah, Ebrahim Soroush, Mohammad Darabi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Molecular diffusion
Materials science Nanoparticle Filtration and Separation 02 engineering and technology 021001 nanoscience & nanotechnology Analytical Chemistry Nanofluid Adsorption 020401 chemical engineering Chemical engineering Hollow fiber membrane Mass transfer Tube (fluid conveyance) 0204 chemical engineering 0210 nano-technology Contactor |
| Zdroj: | Separation and Purification Technology. 210:920-926 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2018.09.005 |
| Popis: | In this study, CO2 absorption enhancement using nanofluids in a gas-liquid hollow fiber membrane contactor (HFMC) was conducted through a 2D mathematical model. The model was developed by considering molecular diffusion in radial and axial directions as well as non-wetting condition. CO2 absorption was conducted from a gas mixture, containing CO2 and air, which flows in the shell. Also, absorbents which are containing CNT and SiO2 nanoparticles flow in tube side counter-currently. The effect of nanoparticles was considered by taking two prominent mechanisms for mass transfer enhancement in nanofluids; i.e., Brownian motion and Grazing effect. Model predictions compared with experimental results and excellent agreement was found. The simulation results indicated that introducing 0.05 wt.% SiO2 nanoparticles enhanced absorption rate up to 16%. CNT because of high adsorption capacity and hydrophobicity showed much better performance than the SiO2 nanoparticles, so that introducing 0.05 wt.% CNT enhanced the absorption rate up to 34%. For better performance of nanoparticle in the absorbent, there is an optimal loading which is 0.03 and 0.04 wt.% for SiO2 and CNT, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect