A high surface area Zr(IV)-based metal-organic framework showing stepwise gas adsorption and selective dye uptake

Exploitation of new metal-organic framework (MOF) materials with high surface areas has been attracting great attention in related research communities due to their broad potential applications. In this work, a new Zr(IV)-based MOF, [Zr6O4(OH)(4)(eddb)(6)] (BUT-30, H(2)eddb=4,4'-(ethyne-1,2-diyl)dibenzoic acid) has been solvothermally synthesized, characterized, and explored for gases and dyes adsorptions. Single-crystal X-ray diffraction analysis demonstrates a three-dimensional cubic framework structure of this MOF, in which each Zr6O4(OH)(4) building unit is linked by 12 linear eddb ligands BUT-30 has been found stable up to 400 degrees C and has a Brunauer-Emmett-Teller (BET) surface area as high as 3940.6 m(2) g(-1) (based on the N-2 adsorption at 77 K) and total pore volume of 1.55 cm(3) g(-1). It is more interesting that this MOF exhibits stepwise adsorption behaviors for Ar, N-2, and CO2 at low temperatures, and selective uptakes towards different ionic dyes. (C) 2014 Elsevier Inc. All rights reserved.