Dr. Bassem A. Al-Maythalony, a Research Scientist
III in the KACST-Technology Innovation Center on Carbon Capture and
Sequestration (KACST-TIC-CCS), has recently published an innovative work titled
“Tuning the Interplay between Selectivity and Permeability of ZIF‑7 Mixed Matrix
Membranes” in the ACS Applied Materials & Interfaces (Impact Factor 7.145),
ACS Publications. http://pubs.acs.org/doi/abs/10.1021/acsami.6b15803
The article reported the fabrication of a new
mixed-matrix membrane (MMM) made of nano- zeolitic imidazolate framework-7
(nZIF-7) or post-synthetically modified-nano-ZIF-7 (PSM-nZIF-7) blended within a
polyetherimide (PEI) matrix. This work demonstrated the power of tuning the pore
environments of MOF nanoparticles for drastically improving the permeability and
selectivity properties of the MMM towards different gas systems. It is noted
that the MMM fabricated from nZIF-7 exhibited the highest selectivities for
CO2/CH4, CO2/C2H6, and CO2/C3H8 gas pairs. Furthermore, the MMM made of
PSM-nZIF-7 displayed some of the highest permeabilities, which resulted in
H2/CH4, N2/CH4, and H2/CO2 permselectivities that are remarkably well-positioned
on the Robeson upper bound curves. This article considered a new insight for
achieving superior membrane designs with previously overlooked blends. Finally,
this work was a collaboration between Dr. Bassem’s team at KFUPM and Prof. Omar
M. Yaghi’s group at UC Berkeley. The success of this research was the direct
result of this collaboration, which has inspired further project development and
the promise for more impactful discoveries to come out in the near future.