Fig. 4

PXRD spectra and SEM image of PET-derived H₂BDC precipitated by (a) C₆H₈O₇ (4.5 M) in 40 min; (b) by H₂SO₄ (4.5 M) in 40 min; (c) (C₆H₈O₇ 5 M/DMSO (1:1), 25 °C, 40 min); (d) ((C₆H₈O₇ 5 M/DMSO = 35/75 mL), 75 °C, 40 min)