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Abstract NbO-type MOF nano/microcrystals were facilely achieved by tuning the volume ratio of DMF and H 2 O mixed solvent under solvothermal conditions. It was found that NOTT-102 rhombohedral sample obtained with DMF:H 2 O volume ratio of 15:5 has the largest BET surface area (3006 m2 g−1), compared to the samples with the DMF:H 2 O volume ratio of 12:8 (2263 m2 g−1) and 20:0 (1962 m2 g−1) as well as the bulk NOTT-102, namely [Cu 2 (QPTC)] (H 4 QPTC = [1,1':4′,1″:4″,1‴-quaterphenyl]-3,3‴,5,5‴-tetracarboxylic acid), crystals (2942 m2 g−1). Furthermore, dye adsorption results indicate that NOTT-102 rhombohedral sample exhibits superior adsorption capacity (850 mg g−1) and adsorption selectivity for methylene blue (MB) in contrast to methyl orange, rhodamine B, and acid chrome blue K dyes, which may be one of the promising candidates for potential application in removal of organic dyes from aqueous solution. Graphical abstract Image 1 Highlights • NbO-type MOF nano/microcrystals were facilely achieved by tuning the volume ratio of DMF and H 2 O. • NOTT-102 rhombohedral sample has the largest BET surface area compared to the other NOTT-102 nano/microcrystals. • NOTT-102 rhombohedral sample exhibits excellent adsorption capacity and selectivity for MB. [ABSTRACT FROM AUTHOR]

A facile and universal method was developed to evaluate the relative water stability of porous MOFs and morphological evolution was achieved by controlling the volume ratio of DMF and H2O. The relative water stability of the studied MOFs is in the order HKUST-1 ＞ MOF-505 ∼ UMCM-150 ＞ NOTT-101 ＞ DUT-23(Cu) ＞ [Zn2(BPnDC)2(DABCO)] ∼ [Cu3(TPTrC)2(DABCO)] ＞ MOF-5. In addition, DUT-23(Cu) [Cu6(BTB)4(BPY)3] (H3BTB = 4,4′,4′′-benzene-1,3,5-triyl-tribenzoic acid, BPY = 4,4′-bipyridine) nanoparticles obtained with a volume ratio of DMF and H2O of 18 : 2 show excellent adsorption capacity for methylene blue (MB) (814 mg g−1) with high selectivity compared with methyl orange, rhodamine B, and acid chrome blue K dyes due to the size and the electrostatic repulsion effects in aqueous solution. [ABSTRACT FROM AUTHOR]