Fig. 3

FESEM image of the synthesized (a) NTP-MOF, (b) NATP-MOF, (c) GCN, (d) NTP/GCN, (e) NATP/GCN composites, (f)–(i) EDS elemental mapping images of NATP/GCN composite, (j), (k) TEM image of NATP/GCN composites, and (l) EDS elemental spectrum of NATP/GCN composite.