“…This means that all recent advances, including green energy technologies, are deficient for meeting the goal of net zero-carbon emission without the help of carbon capture and recycling technologies. 3–8 In fact, carbon is being continuously released in various natural processes and is not categorized as a pollutant class up to the scale of the earth's natural capacity to neutralize its impact. In imitation of this auto-neutralization by nature, some carbon dioxide recycling industries are being developed in parallel to incorporate its benefits in carbonated beverages, fire extinction, refrigerants, inert blankets for food items, decaffeination of coffee, and the production of urea, calcium carbonate, etc.…”
The rare earth doped oxides have been intensively promoted since last two decades to embrace the high-performance target of ceramic-carbonate composite CO2-separation membrane, with countless incidents of exsolution. Unfortunately, information...
“…This means that all recent advances, including green energy technologies, are deficient for meeting the goal of net zero-carbon emission without the help of carbon capture and recycling technologies. 3–8 In fact, carbon is being continuously released in various natural processes and is not categorized as a pollutant class up to the scale of the earth's natural capacity to neutralize its impact. In imitation of this auto-neutralization by nature, some carbon dioxide recycling industries are being developed in parallel to incorporate its benefits in carbonated beverages, fire extinction, refrigerants, inert blankets for food items, decaffeination of coffee, and the production of urea, calcium carbonate, etc.…”
The rare earth doped oxides have been intensively promoted since last two decades to embrace the high-performance target of ceramic-carbonate composite CO2-separation membrane, with countless incidents of exsolution. Unfortunately, information...
This study employed modified graphitic carbon nitride (g‐C3N4) nanosheets and polyether block amide (Pebax) to prepare mixed matrix membranes (MMMs) aiming to enhance CO2 separation efficiency. Through sulfonation and zinc ion (Zn2+) modification of g‐C3N4 nanosheets, high Zn2+ loaded nanofillers (SCN‐Zn2+) were synthesized. Compared to g‐C3N4, MMMs with SCN‐Zn2+ as nanofiller showed a CO2 permeance of 462 Barrer as well as the CO2/N2 selectivity of 47.5 at the feed gas pressure of 2 bar, which surpassed the 2008 Robeson upper bound. Additionally, the Pebax/SCN‐Zn2+(30) membrane was subjected to continuous gas permeability experiments for 70 h and showed good stability. The results showed that SCN‐Zn2+ nanosheets played an important role in enhancing the gas selectivity of the membranes. SEM confirmed that the SCN‐Zn2+ nanosheets had good compatibility with the Pebax substrate and the presence of hydrophilic sulfonic acid groups effectively suppressed the interfacial defects. The increase in the free volume fraction of the membranes as well as the solubility and diffusion coefficient suggested that the introduction of g‐C3N4 nanosheets led to more tortuous gas transport paths, which enhanced the permeability and selectivity of CO2.
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