An anionic zeolite-like metal–organic framework (AZMOF) with a Moravia network for organic dye absorption through cation-exchange

Abstract

An anionic zeolite-like metal–organic framework (AZMOF) with a twisted partially augmented the net, known as the “Moravia” net, [(CH₃)₂NH₂]₆[Sr₁₃(O)₃(BTTC)₈(OH)₂(H₂O)₁₆]·xS (Sr-BTTC, where S represents non-coordinated solvent molecules, and BTTC is the abbreviation of benzo-(1,2;3,4;5,6)-tris-(thiophene-2′-carboxylic acid)), has been solvothermally synthesized and characterized, which possesses an anionic framework and nano-sized sodalite cage. Through cation-exchange, Sr-BTTC is capable of uptaking large organic cationic dyes including Rhodamine B (RB), Basic Red 2 (BR2), Crystal Violet (CV) and Methylene Blue (MB), amongst which the adsorption capability for RB (up to 545 mg g⁻¹), and BR2 (up to 675 mg g⁻¹) is the highest for reported absorbants to date.