A review of polymeric composite membranes for gas separation and energy production

Volatile organic compounds (VOCs) are a crucial kind of pollutants in the environment due to their obvious features of severe toxicity, high volatility, and poor degradability. It is particularly urgent to control the emission of VOCs due to the persistent increase of concentration and the stringent regulations. In China, clear directions and requirements for reduction of VOCs have been given in the "national plan on environmental improvement for the 13th Five-Year Plan period". Therefore, the development of efficient technologies for removal and recovery of VOCs is of great significance. Recovery technologies are favored by researchers due to their advantages in both recycling VOCs and reducing carbon emissions. Among them, adsorption and membrane separation processes have been extensively studied due to their remarkable industrial prospects. This overview was to provide an up-to-date progress of adsorption and membrane separation for removal and recovery of VOCs. Firstly, adsorption and membrane separation were found to be the research hotspots through bibliometric analysis. Then, a comprehensive understanding of their mechanisms, factors, and current application statuses was discussed. Finally, the challenges and perspectives in this emerging field were briefly highlighted. 

Adsorption and membrane separation for removal and recovery of volatile organic compounds.

Antifouling polyimide membrane with grafted silver nanoparticles and zwitterion

A novel strategy to design a high-performance composite membrane for CO2 capture via coating a thin layer of water-swellable polymers (WSPs) onto a porous support with enriched CO2-philic groups is demonstrated in this study. First, by employing a versatile platform technique combining nonsolvent-induced phase separation and surface segregation, porous support membranes with abundant CO2-philic ethylene oxide (EO) groups at the surface are successfully prepared. Second, a thin selective layer composed of Pebax MH 1657 is deposited onto the support membranes via dip coating. Because of the water-swellable characteristic of Pebax and the enriched EO groups at the interface, the composite membranes exhibit high CO2 permeance above 1000 GPU with CO2/N-2 selectivity above 40 at a humidified state (25 degrees C and 3 bar). By tuning the content of the PEO segment at the interface, the composite membranes can show either high CO2 permeance up to 2420 GPU with moderate selectivity of 46.0 or high selectivity up to 109.6 with fairly good CO2 permeance of 1275 GPU. Moreover, enrichment of the PEO segment at the interface significantly improves interfacial adhesion, as revealed by the T-peel test and positron annihilation spectroscopy measurement. In this way, the feasibility of designing WSP-based composite membranes by enriching CO2-philic groups at the interface is validated. We hope our findings may pave a generic way to fabricate high-performance composite membranes for CO2 capture using cost-effective materials and facile methods.

High-Performance Composite Membrane with Enriched CO2-philic Groups and Improved Adhesion at the Interface

Impregnated electrospun nanofibrous membranes for water vapour transport applications

Biomaterials with exceptional biocompatibility and bioactivity are now pushing the boundaries of bone tissue engineering. In this study, natural Arabic gum biopolymer incorporating titanium dioxide nanoparticles (NAG+TiO2NP) nanocomposite film was fabricated. The FTIR and XRD analysis show the presence of functional groups assigned to NAG biopolymers and highly crystalline anatase TiO2NP. Well dispersed TiO2NP can be seen from SEM micrograph suggesting good interaction between TiO2NP filler and NAG biopolymer matrix to enhance the mechanical characteristics of nanocomposite film. The NAG+TiO2NP nanocomposite film exhibited strong bioactivity to form bone-like apatite and promoted the proliferation of MG-63 cells attributed to their excellent biocompatibility and non-toxicity. The NAG+TiO2NP nanocomposite film also displays high antibacterial activity with (36.33 ± 1.53) mm and (27.00 ± 2.00) mm inhibition zone were recorded against Staphylococcus Aureus and Escherichia Coli. The findings indicate that the NAG+TiO2NP nanocomposite film, with its improved mechanical properties, high swelling capacity, biodegradability, and non-toxicity, shows promise as a viable option for bone tissue regeneration materials. 

Non-cytotoxic and bioactive nanocomposite film of natural Arabic gum incorporating TiO2 nanoparticles for bone tissue regeneration

A novel method for the direct detection of light stabilizer Tinuvin 622 in polymer additives by gel permeation chromatography combined with multi-angle laser light scattering.

Substrate resistance in composite membranes for organic vapour/gas separations

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Non-cytotoxic and bioactive nanocomposite film of natural Arabic gum incorporating TiO2 nanoparticles for bone tissue regeneration

A novel method for the direct detection of light stabilizer Tinuvin 622 in polymer additives by gel permeation chromatography combined with multi-angle laser light scattering.

Substrate resistance in composite membranes for organic vapour/gas separations