title: Effects of ammonium hydroxide on the structure and gas adsorption of nanosized Zr-MOFs (UiO-66).
abstract: Several zirconium-based metal-organic frameworks (Zr-MOFs) have been synthesized using ammonium hydroxide as an additive in the synthesis process. Their physicochemical properties have been characterized by N(2) adsorption/desorption, XRD, SEM, FTIR, and TGA, and their application in CO(2) adsorption was evaluated. It was found that addition of ammonium hydroxide produced some effects on the structure and adsorption behavior of Zr-MOFs. The pore size and pore volume of Zr-MOFs were enhanced with the additive, however, specific surface area of Zr-MOFs was reduced. Using an ammonium hydroxide additive, the crystal size of Zr-MOF was reduced with increasing amount of the additive. All the samples presented strong thermal stability. Adsorption tests showed that capacity of CO(2) adsorption on the Zr-MOFs under standard conditions was reduced due to decreased micropore fractions. However, modified Zr-MOFs had significantly lower adsorption heat. The adsorption capacity of carbon dioxide was increased at high pressure, reaching 8.63 mmol g(-1) at 987 kPa for Zr-MOF-NH(4)-2.
authors.affiliation: Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
authors.forename: Hussein Rasool
authors.initials: HR
authors.lastname: Abid
authors.forename: Ha Ming
authors.initials: HM
authors.lastname: Ang
authors.forename: Shaobin
authors.initials: S
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D064753:Ammonium Hydroxide; D002245:Carbon Dioxide / Q000737:chemistry; D005740:Gases / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
chemical_list: D005740:Gases; D006878:Hydroxides; D002245:Carbon Dioxide; D064753:Ammonium Hydroxide; D015040:Zirconium