Pore size and interactions effect on removal of dyes with two lead(II) metal-organic frameworks

• Published in: Materials letters Vol. 175; pp. 1 - 4
• Main Authors: Hu, Mao-Lin, Hashemi, Lida, Morsali, Ali
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-07-2016
• Subjects: Adsorption; Anionic dye; Cationic; Cationic dye; Desorption; Dye elimination; Dyes; Metal-organic frameworks; Methyl alcohol; Pore size; Porosity; Porous material; Spectroscopy; Spectroscopy; Cationic dye; Anionic dye; Porous material; Dye elimination
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2016.03.100

Two typical highly porous metal-organic framework (MOF) materials based on lead(II), [Pb(4-bpdh)(NO3)2(H2O)]n (TMU-1) and [Pb(4-bpdh)(NO3)2]n (TMU-2) have been used for the removal of harmful dyes (anionic dye methyl orange (MO) and cationic dye methylene blue (MB)) from contaminated water via adsorption. The adsorption capacities of TMU-1 and TMU-2 are much higher than those of an activated carbon. Our results show that the difference between MO and MB adsorption in TMU-1 and TMU-2 could be relate to pore size and coordinated H2O interactions. Dye elimination has also been studied by the use of adsorption/desorption process. The delivery of dyes from compounds in methanol at room temperature was determined by UV/vis spectroscopy.
•Stable MOFs (TMU-1) and (TMU-2) with rigid empty pores have been used for the removal of harmful dyes.•The adsorption capacities of TMU-1 and TMU-2 are much higher than those of an activated carbon.•Difference between MO and MB adsorption in TMU-1 and TMU-2 could be relate to pore size and coordinated H2O interactions.•Dye elimination rate conforms from this relation: MO@TMU-2>MB@TMU-2>MB@TMU-1>MO@TMU-1.