Effect of Mesoporous TiO2 in Facilitated Olefin Transport Membranes Containing Ag Nanoparticles

다국어 초록 (Multilingual Abstract)

Facilitated transport is considered to be a possible solution to simultaneously improve permeability and selectivity, which is challenging in normal polymeric membranes based on solution-diffusion transport only. We investigated the effect of adding mesoporous TiO2 (m-TiO2) upon the separation performance of facilitated olefin transport membranes comprising poly(vinyl pyrrolidone), Ag nanoparticles, and 7,7,8,8-tetracyanoquinodimethane as the polymer matrix, olefin carrier, and electron acceptor, respectively. In particular, m-TiO2 was prepared by means of a facile, mass-producible method using poly(vinyl chloride)-g-poly(oxyethylene methacrylate) graft copolymer as the template. The crystal phase of m-TiO2 consisted of an anatase/rutile mixture, of crystallite size approximately 16 nm as determined by X-ray diffraction. The introduction of m-TiO2 increased the membrane diffusivity, thereby increasing the mixed-gas permeance from 1.6 to 16.0 GPU (1 GPU = 10-6 cm3(STP)/(s × cm2 × cmHg), and slightly decreased the propylene/propane selectivity from 45 to 37.
However, both the mixed-gas permeance and selectivity of the membrane containing m-TiO2 rapidly decreased over time, whereas the membrane without m-TiO2 had more stable long-term performance. This difference might be attributed to specific chemical interactions between TiO2 and Ag nanoparticles, causing Ag to lose activity as an olefin carrier.

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