Polyethyleneimine-Modified UiO-66-NH<sub>2</sub>(Zr) Metal-Organic Frameworks: Preparation and Enhanced CO<sub>2</sub> Selective Adsorption.

ACS Omega · 2019 · PMC6648867 · PMID 31459536

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an increasing trendno p-value reported

44 After PEI modification, the multiple broad proton signals of −CH 2 in PEI and glutaraldehyde appeared at 2.3–2.6 ppm. The peak intensity shows an increasing trend while the PEI loading increased.

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