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. 2024 Dec 30;15:10861. doi: 10.1038/s41467-024-55163-4

Fig. 6. Microenvironmental pH increase of Zr-MOFs through poly(ethylene imine) confinement for hydrolytic activity improvement.

Fig. 6

a Scheme of structures of Zr-MOF and Zr-MOF@PEI/PEGDE with increased microenvironmental hydroxide ions, and enhanced catalytic hydrolysis of substrate pNPP. SEM images of (b) MOF-808 NPs and (c) MOF-808@PEI/PEGDE NPs taken from one batch of NPs. UV–vis spectra of pNPP solutions before and after 20-min incubation with (d) MOF-808 NPs, and (e) MOF-808@PEI/PEGDE NPs. f Absorbance changes at 407 nm (∆A407 nm) of pNPP before and after 20-min incubation with Zr-MOF NPs and Zr-MOF@PEI/PEGDE NPs including MOF-808 NPs, UiO-66 NPs, NH2-UiO-66 NPs, UiO-67 NPs, and NU-1000 NPs. Data in (f) are expressed as mean values ± SEM, n = 3.