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Morphology and structure of TBP-Hf and TBC-Hf. (a) PXRD patterns of TBP-Hf, TBC-Hf, and IDOi@TBC-Hf in comparison to MOF-545. TEM images of TBP-Hf (b,c), TBC-Hf (d,e), and TBC-Hf after incubation in Hank’s balanced salt solution for 24 h (f).