Metal–organic framework with diamondoid structure constructed with precisely placed tetrahedral borate anions and copper(i) cations.
A study on As(III) removal using Fe(III) loaded pomegranate waste as an adsorbent is presented. The effects of initial metal ion concentration, contact time, adsorbent dose and pH of the solution on the removal of arsenic were investigated in a batch system. The optimum pH for As(III) adsorption using Fe(III)-loaded charred pomegranate waste [Fe-CPW] was found to be 9. The equilibrium has beenachieved in 2 hours. The maximum adsorption capacity (qmax) for the adsorption of As (III) was found tobe 50 mg/g. The experimental data fitted well with the Langmuir adsorption isotherm model.DOI: http://dx.doi.org/10.3126/jncs.v30i0.9332Journal of Nepal Chemical Society Vol. 30, 2012 Page: 29-36 Uploaded date: 12/16/2013
Charge-separated metal-organic frameworks (MOFs)a re au nique class of MOFs that can possess added properties originating from the exposed ionic species. A new charge-separated MOF,n amely,U NM-6 synthesized from atetrahedral borate ligand and Co 2 + cation is reported herein. UNM-6c rystalizes into the highly symmetric P43n space group with fourfold interpenetration, despite the stoichiometrici mbalance between the Ba nd Co atoms,w hich also leads to loosely bound NO 3 À anions within the crystal structure. These NO 3 À ions can be quantitatively exchangedw ith various other anions, leadingt o Lewis acid (Co 2 +)a nd Lewis base (anions) pairs within the pores and potentially cooperative catalytic activities.F or example, UNM-6-Br,t he MOF after anion exchange with Br À anions, displays high catalytic activity and stability in reactions of CO 2 chemical fixation into cyclic carbonates. The field of metal-organic framework (MOF) has expanded at an incredible rate with constantly emerging new MOF structures possessing tailor-designed surface areas and functionalities, pore sizes and shapes,a nd pore volumes for am yriado f promisinga pplications. [1-9] The majority of existing MOFs con
Metal–organic frameworks (MOFs) are an emerging class of microporous materials that have potential applications in a wide range of areas. As a subclass of MOFs, ionic MOFs, especially charge-separated MOFs, have been relatively less studied but possess unique features including strong host–guest interactions from the exposed charged centers. We report the synthesis and single-crystal structural characterization of five new charge-separated MOFs (UNM 1–5) based on two tetrapodal borate ligands: tetrakis(4-(4-pyridineethynyl)-2,3,5,6-tetrafluorophenyl)borate (T1) and tetrakis(4-(4-pyridyl)-2,3,5,6-tetrafluorophenyl)borate (T2) having rigid arms of different lengths and pyridine groups at the end of each arm. Coordination of these tetrapods with Cu(I), Cu(II), and Ag(I) ions under specific conditions led to a series of new charge-separated MOFs in single crystalline forms. UNM-1 and UNM-2/UNM-3, which crystallize respectively in tetragonal I4̅ space group and monoclinic C2/c space group, are derived from Cu(CH3CN)4BF4 and Cu(NO3)2 upon coordination with T1. On the other hand, coordination of T2 with Cu(CH3CN)4BF4 and AgBF4 respectively yielded UNM-4 and UNM-5 in the monoclinic I2/a space group. All these MOFs possess several degrees of interpenetration that are correlated with the arm lengths of ligands. Noticeably, UNM-1 is 4-fold interpenetrated, leading to the highest stability among all five MOFs, while still displaying an impressive Brunauer–Emmett–Teller (BET) surface area (SABET) of ca. 621 m2/g. Our findings highlight the versatility of tetrapodal borate ligands in engineering charge-separated MOFs with diverse structures and controlled functionality.
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