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Enhancement of CO₂ Desorption from a Novel Absorbent (Dimethyl Carbonate) by Using a PDMS/TiO₂ Pervaporation Membrane

Ataeivarjovi, Ebrahim, Tang, Zhigang, Chen, Jian, Zhao, Zhijun, Dong, Guo
ACS sustainable chemistry & engineering 2019 v.7 no.14 pp. 12125-12137
absorbents, absorption, carbon, carbon dioxide, carbonates, climate change, desorption, emissions, energy, models, nanocomposites, nanoparticles, operating costs, pervaporation, polydimethylsiloxane, solvents, temperature, titanium dioxide
Currently, there is strong interest in carbon capture and absorption as a means of reducing carbon dioxide emissions and combating climate change. Unfortunately, the current and traditional methods to achieve such goals are not economical, because they require a huge absorption–desorption plant with high investment and operating costs and high recycle rates of chemical absorbers. In this paper, we propose a novel CO₂ capture method combining dimethyl carbonate as a physical solvent and polydimethylsiloxane (PDMS)/TiO₂ nanocomposite as a desorption membrane. The effects of TiO₂ concentration, feed temperature, and permeate pressure on the pervaporation process for CO₂ capture were studied. Results showed that the addition of TiO₂ nanoparticles (up to 5 wt %) resulted in 3.61 kg/m²·h flux and 44.68 selectivity of the membrane. The presence of TiO₂ nanoparticles in the PDMS membrane not only increased the performance of membrane’s but also reduced (about 72%) energy consumption. To corroborate our experimental findings, a simple simulation was conducted by Gaussian 09. The modeling results demonstrated that the incorporation of TiO₂ nanoparticles to the PDMS led to favorable absorption of CO₂ compared with the composite one. These results indicate a novel and promising method to capture CO₂ effectively and economically for industrial purposes.