Facile water-stability evaluation of metal-organic frameworks and the property of selective removal of dyes from aqueous solution

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 45; no. 21; pp. 8753 - 8759
• Main Authors: Qi, Zhao-Peng, Yang, Ji-Min, Kang, Yan-Shang, Guo, Fan, Sun, Wei-Yin
• Format: Journal Article
• Language: English
• Published: England 01.01.2016
• Subjects: Aqueous solutions; Dyes; Electrostatics; Evolution; Metal-organic frameworks; Methylene blue; Nanoparticles; Water stability
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c6dt00886k

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 H 2 O. The relative water stability of the studied MOFs is in the order HKUST-1 > MOF-505 ∼ UMCM-150 > NOTT-101 > DUT-23(Cu) > [Zn 2 (BPnDC) 2 (DABCO)] ∼ [Cu 3 (TPTrC) 2 (DABCO)] > MOF-5. In addition, DUT-23(Cu) [Cu 6 (BTB) 4 (BPY) 3 ] (H 3 BTB = 4,4′,4′′-benzene-1,3,5-triyl-tribenzoic acid, BPY = 4,4′-bipyridine) nanoparticles obtained with a volume ratio of DMF and H 2 O 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. A facile method was developed to evaluate the relative water stability of MOFs by controlling the volume ratio of DMF and H 2 O.