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metal-organic framework

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https://www.readbyqxmd.com/read/29331933/combined-effects-of-ag-and-uio-66-for-removal-of-elemental-mercury-from-flue-gas
#1
Songjian Zhao, Dongyao Chen, Haomiao Xu, Jian Mei, Zan Qu, Ping Liu, Yong Cui, Naiqiang Yan
The zirconium metal-organic framework material UiO-66 was doped with Ag nanoparticles and investigated for the removal of elemental mercury (Hg0) in flue gas. Physical and chemical characterization of the adsorbents showed that adding Ag did not change the crystal structure and morphology of the UiO-66. Ag doping can improve the redox activity of UiO-66, and the adsorbent exhibited high thermal stability and surface area. Hg0 removal experiments indicated that UiO-66 exhibited the higher performance compared with P25 and activated carbon, and the addition of Ag exhibited a significant synergistic effect with the UiO-66, which had highest Hg0 adsorption capacity (3...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331822/synthesis-of-uio-66-oh-zirconium-metal-organic-framework-and-its-application-for-selective-extraction-and-trace-determination-of-thorium-in-water-samples-by-spectrophotometry
#2
Zahra Safaei Moghaddam, Massoud Kaykhaii, Mostafa Khajeh, Ali Reza Oveisi
In this study, a zirconium-based metal-organic framework (Zr-MOF), named UiO-66-OH, was synthesized by the solvo-thermal method and characterized by Fourier transform-infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM). This Zr-MOF was then employed as a sorbent for selective extraction and preconcentration of thorium ions after their complexation with 2‑(2,4‑dihydroxyphenyl)‑3,5,7‑trihydroxychromen‑4‑one (morin) from environmental water samples prior to its spectrophotometrical determination...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29331094/solvent-impedes-co2-cycloaddition-on-metal-organic-frameworks
#3
Dan Shao, Jinbiao Shi, Jianling Zhang, Xiuniang Tan, Tian Luo, Xiuyan Cheng, Bingxing Zhang, Buxing Han
The catalytic performance of metal-organic frameworks (MOFs) for the synthesis of cyclic carbonate from carbon dioxide and epoxides has been explored in solvent and solvent-free conditions, respectively. It was found that MOF catalysts have significantly improved catalytic activities in solvent-free CO2 cycloaddition reactions than those in solvent. The mechanism was discussed from the competition of solvent with substrate to adhere MOF catalysts during reaction process.
January 13, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29330963/metal-organic-framework-based-in-syringe-solid-phase-extraction-for-the-on-site-sampling-of-polycyclic-aromatic-hydrocarbons-from-environmental-water-samples
#4
Xiaoqiong Zhang, Peiyi Wang, Qiang Han, Hengzhen Li, Tong Wang, Mingyu Ding
In-syringe solid-phase extraction is a promising sample pretreatment method for the on-site sampling of water samples because of its outstanding advantages of portability, simple operation, short extraction time and low cost. In this work, a novel in-syringe solid-phase extraction device using metal-organic frameworks as the adsorbent was fabricated for the on-site sampling of polycyclic aromatic hydrocarbons from environmental waters. Trace polycyclic aromatic hydrocarbons were effectively extracted through the self-made device followed by gas chromatography with mass spectrometry analysis...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29329711/colorimetric-logic-gate-for-alkaline-phosphatase-based-on-copper-ii-based-metal-organic-frameworks-with-peroxidase-like-activity
#5
Caihong Wang, Jie Gao, Yili Cao, Hongliang Tan
Nanozymes have been extensively exploited in the construction of colorimetric sensors in the past decade. However, as lack of specific recognition element, these sensors are mostly limited in the detection of hydrogen peroxide and its related agents. In this work, a colorimetric assay for the detection of alkaline phosphatase (ALP) activity was developed by employing copper (II)-based metal-organic frameworks (Cu-MOFs) as peroxidase mimic and pyrophosphate (PPi) as recognition element. Benefiting from its intrinsic porosity, Cu-MOFs built from one-step self-assembly showed a superior catalytic activity over horseradish peroxidase...
April 3, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29327755/reversible-three-equal-step-spin-crossover-in-an-iron-ii-hofmann-type-metal-organic-framework
#6
Fu-Ling Liu, Dong Li, Li-Jie Su, Jun Tao
A novel bent ligand-pillared three-dimensional Hofmann-type metal-organic framework, [FeII(Hbpt)Pt(CN)4]·1/2Hbpt·1/2CH3OH·5/2H2O [1, Hbpt = 4,4'-(1H-1,2,4-triazole-3,5-diyl) dipyridine], was synthesized and crystallographically and magnetically characterized, which showed incomplete three-step spin-crossover behavior with a reversible three equal-step sequence of HS1.00 ↔ HS0.75LS0.25 ↔ HS0.5LS0.5 ↔ HS0.25LS0.75.
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29327748/four-new-metal-organic-frameworks-based-on-diverse-secondary-building-units-sensing-and-magnetic-properties
#7
Yang-Tian Yan, Wen-Yan Zhang, Fang Zhang, Feng Cao, Rui-Feng Yang, Yao-Yu Wang, Lei Hou
Four new metal-organic frameworks (MOFs), {[Zn3(L)(OH)(H2O)5]·NMP·2H2O}n (1), {[H2N(Me)2][Zn2(L)(H2O)]·DMF·H2O}n (2), {[Co5(L)2(H2O)11]·2H2O}n (3) and {[Mn5(L)2(H2O)12]·6H2O}n (4), were assembled employing a symmetrical V-shaped rigid multicarboxylic acid ligand H5L (H5L = 2,4-di(3',5'-dicarboxylphenyl)benzoic acid) with different metal ions, resulting in versatile frameworks as well as various types of coordination modes of H5L. 1 forms a three-dimensional (3D) 4-connected sra net based on trinuclear [Zn3(μ3-OH)(μ2-COO)(μ1-COO)4] clusters, while 2 displays a 3D (4,6)-connected net based on two types of binuclear [Zn2(μ2-COO)2(μ1-COO)4] and [Zn2(μ2-COO)4] clusters...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29327475/tuning-the-activity-of-carbon-for-electrocatalytic-hydrogen-evolution-via-an-iridium-cobalt-alloy-core-encapsulated-in-nitrogen-doped-carbon-cages
#8
Peng Jiang, Jitang Chen, Changlai Wang, Kang Yang, Shipeng Gong, Shuai Liu, Zhiyu Lin, Mengsi Li, Guoliang Xia, Yang Yang, Jianwei Su, Qianwang Chen
Graphene, a 2D material consisting of a single layer of sp2 -hybridized carbon, exhibits inert activity as an electrocatalyst, while the incorporation of heteroatoms (such as N) into the framework can tune its electronic properties. Because of the different electronegativity between N and C atoms, electrons will transfer from C to N in N-doped graphene nanosheets, changing inert C atoms adjacent to the N-dopants into active sites. Notwithstanding the achieved progress, its intrinsic activity in acidic media is still far from Pt/C...
January 12, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29326992/a-cu-ii-metal-organic-framework-with-significant-h2-and-co2-storage-capacity-and-heterogeneous-catalysis-for-the-aerobic-oxidative-amination-of-c-sp3-h-bonds-and-biginelli-reactions
#9
Anoop K Gupta, Dinesh De, Kapil Tomar, Parimal K Bharadwaj
A Cu(ii) metal-organic framework, {[Cu2(L)(H2O)2]·(5DMF)(4H2O)}n (1), has been synthesized using an angular tetracarboxylic acid ligand (H4L) incorporating both trifluoromethyl (-CF3) and amine (-NH2) groups. Notably, the framework possesses high water and thermal stability. At atmospheric pressure, the activated framework 1' exhibits substantially high amounts of CO2 (35.5 and 20.8 wt% at 273 and 298 K respectively) and H2 (1.72 wt% at 77 K) adsorption. Also, 1' exhibits excellent catalytic activity for the condensation-cyclization reaction between 2-benzoyl pyridine and different benzylamines via oxidative amination of the C(sp3)-H bond to form 1,3-diarylated imidazo[1,5-a]pyridines under mild aerobic conditions...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29326271/ordered-macro-microporous-metal-organic-framework-single-crystals
#10
Kui Shen, Lei Zhang, Xiaodong Chen, Lingmei Liu, Daliang Zhang, Yu Han, Junying Chen, Jilan Long, Rafael Luque, Yingwei Li, Banglin Chen
We constructed highly oriented and ordered macropores within metal-organic framework (MOF) single crystals, opening up the area of three-dimensional-ordered macro-microporous materials (that is, materials containing both macro- and micropores) in single-crystalline form. Our methodology relies on the strong shaping effects of a polystyrene nanosphere monolith template and a double-solvent-induced heterogeneous nucleation approach. This process synergistically enabled the in situ growth of MOFs within ordered voids, rendering a single crystal with oriented and ordered macro-microporous structure...
January 12, 2018: Science
https://www.readbyqxmd.com/read/29323487/nanocoating-of-hydrophobic-mesoporous-silica-around-mil-101cr-for-enhanced-catalytic-activity-and-stability
#11
Jie Ying, Annika Herbst, Yu-Xuan Xiao, Hao Wei, Ge Tian, Zhaofei Li, Xiao-Yu Yang, Bao-Lian Su, Christoph Janiak
The metal-organic framework (MOF) MIL-101Cr was readily encapsulated by a very thin shell (around 30 nm) of hydrophobic mesoporous silica, which replicates the irregular shape of the MOF nanocrystals. Such a silica shell facilitates the diffusion of hydrophobic reactants with enhancement of the catalytic activity of the MOF and significantly improved catalytic stability of the MOF in the oxidation of indene.
January 11, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29323480/tailoring-the-fluorescence-of-aie-active-metal-organic-frameworks-for-aqueous-sensing-of-metal-ions
#12
Qiyang Li, Xiuju Wu, Xiaoli Huang, Yangjun Deng, Nanjian Chen, Dandan Jiang, Lili Zhao, Zhihua Lin, Yonggang Zhao
A hydroxyl functionalized ligand was designed for the construction of MOF materials with aggregation-induced emission (AIE) feature, in which the fluorescence can be deliberately tailored: quenching the fluorescence to an "off" state by the decoration with heterocyclic auxiliary ligand 4,4'-bypyridine (Bpy) in the framework as quenching agent; triggering the enhanced fluorescence to an "on" state by removal of Bpy through the metal competitive coordination substitution strategy. Our study shows that the occurrence of exciton migration between the AIE linker and the conjugated auxiliary ligand Bpy cause the fluorescence quenching...
January 11, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29323458/metal-organic-framework-encapsulation-for-the-preservation-and-photothermal-enhancement-of-enzyme-activity
#13
Sirimuvva Tadepalli, Jieun Yim, Sisi Cao, Zheyu Wang, Rajesh R Naik, Srikanth Singamaneni
Interfacing biomolecules with functional materials is a key strategy toward achieving externally-triggered biological function. The rational integration of functional proteins, such as enzymes, with plasmonic nanostructures that exhibit unique optical properties such as photothermal effect provides a means to externally control the enzyme activity. However, due to the labile nature of enzymes, the photothermal effect of plasmonic nanostructures is mostly utilized for the enhancement of the biocatalytic activity of thermophilic enzymes...
January 11, 2018: Small
https://www.readbyqxmd.com/read/29323390/bimetal-organic-frameworks-for-functionality-optimization-mnfe-mof-74-as-a-stable-and-efficient-catalyst-for-the-epoxidation-of-alkenes-with-h2o2
#14
Kuo Yuan, Tianqun Song, Dawei Wang, Ye Zou, Jinfeng Li, Xiaotao Zhang, Zhiyong Tang, Wenping Hu
In this work, we synthesized a series of microcrystalline MnxN100-x-MOF-74 (N = Fe, Co and Ni) materials by a one-pot reaction. Powder X-ray diffraction (PXRD) patterns of MnxN100-x-MOF-74 matched well with those of single-metal MOF-74, and the scanning electron microscopy (SEM) images exhibited homogeneous nanocrystallites aggregated together. The amounts and dispersion of metals were analyzed by using inductively coupled plasma (ICP) and energy-dispersive X-ray spectroscopy (EDS), separately. MnxN100-x-MOF-74 could remain crystalline and efficiently catalyze the epoxidation of alkenes in DMF with NaHCO3 and 30% H2O2...
January 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/29323380/aldehyde-functionalized-metal-organic-frameworks-for-selective-sensing-of-homocysteine-over-cys-gsh-and-other-natural-amino-acids
#15
Jian Wang, Yanhong Liu, Min Jiang, Yang Li, Lingling Xia, Pengyan Wu
A novel aldehyde-functionalized porous metal-organic framework (MOF) material has been constructed that can act as the first example of MOF-implicated sensors for discriminating Hcy from natural amino acids and even thiol-related peptides (GSH) with high sensitivity (LOD = 40 nM). The sensing mechanism is also discussed.
January 11, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29323375/confinement-of-polysulfides-within-bi-functional-metal-organic-frameworks-for-high-performance-lithium-sulfur-batteries
#16
Xu-Jia Hong, Tian-Xiong Tan, Yu-Kai Guo, Xue-Ying Tang, Jian-Yi Wang, Wei Qin, Yue-Peng Cai
A lithium-sulfur (Li-S) battery is regarded as the most promising candidate for next generation energy storage systems, because of its high theoretical specific capacity (1675 mA h g-1) and specific energy (2500 W h kg-1), as well as the abundance, low cost and environmental benignity of sulfur. However, the soluble polysulfides Li2Sx (4 ≤ x ≤ 8) produced during the discharge process can cause the so-called "shuttle effect" and lead to low coulombic efficiency and rapid capacity fading of the batteries, which seriously restrict their practical application...
January 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/29322772/stable-aluminum-metal-organic-frameworks-al-mofs-for-balanced-co2-and-water-selectivity
#17
Haiwei Li, Xiao Feng, Dou Ma, Mengxi Zhang, Yuanyuan Zhang, Yi Liu, Jinwei Zhang, Bo Wang
Three new Al-MOFs in the formation of [Al4(OH)2(OCH3)4(OH-BDC)3]·xH2O (BIT-72), [Al4(OH)2(OCH3)4(CH3-BDC)3]·xH2O (BIT-73) and {Al4(OH)2(OCH3)4[(CH3)2-BDC]3}·xH2O (BIT-74) have been synthesized by assembling Al3+ ion with terephthalic acid ions decorated with monohydroxyl, monomethyl or dimethyl groups, respectively. All of these three MOFs exhibit high stability in boiling water and acidic conditions. Among them, BIT-72 shows the highest surface area of 1618 m2·g-1 and IAST CO2/N2 selectivity of 48, while BIT-73 and BIT-74 present moderate IAST CO2/N2 selectivity and much lower H2O capacity below P/P0 = 0...
January 11, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29320156/highly-stable-copper-i-based-metal-organic-framework-assembled-with-resorcin-4-arene-and-polyoxometalate-for-efficient-heterogeneous-catalysis-of-azide-alkyne-click-reaction
#18
Bing-Bing Lu, Jin Yang, Guang-Bo Che, Wen-Yuan Pei, Jian-Fang Ma
A new highly stable copper(I)-based metal-organic framework (MOF), namely, [CuI4(SiW12O40)(L)]·6H2O·2DMF (1), was synthesized by incorporating Keggin-type polyoxometalate (POM) anions and a functionalized wheel-like resorcin[4]arene-based ligand (L) under sovothermal condition. 1 exhibits a charming 3D supramolecular architecture sandwiched by the POM anions. Noticeably, 1 has exceptional chemical stability, especially in organic solvents or aqueous solutions with a wide range of pH values. Considering the catalytically active Cu(I) sites in 1, the azide-alkyne cycloaddition (AAC) reaction was studied by employing 1 as the heterogeneous catalyst...
January 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29319311/chiral-silver-lanthanide-metal-organic-frameworks-comprised-of-one-dimensional-triple-right-handed-helical-chains-based-on-ln7-%C3%AE-3-oh-8-13-clusters
#19
Yan Guo, Lijuan Zhang, Nadeem Muhammad, Yan Xu, Yunshan Zhou, Fang Tang, Shaowei Yang
Three new isostructural chiral silver-lanthanide heterometal-organic frameworks [Ag3Ln7(μ3-OH)8(bpdc)6(NO3)3(H2O)6](NO3)·2H2O [Ln = Eu (1), Tb (2, Sm (3); H2bpdc = 2,2'-bipyridine-3,3'-dicarboxylic acid] based on heptanuclear lanthanide clusters [Ln7(μ3-OH)8]13+ comprised of one-dimensional triple right-handed helical chains were hydrothermally synthesized. Various means such as UV-vis spectroscopy, IR spectroscopy, elemental analysis, powder X-ray diffraction, and thermogravimetric/differential thermal analysis were used to characterize the compounds, wherein compound 3 was crystallographically characterized...
January 10, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29319098/ceo2-x-c-rgo-nanocomposites-derived-from-ce-mof-and-graphene-oxide-as-a-robust-platform-for-highly-sensitive-uric-acid-detection
#20
Bangguo Peng, Jiewu Cui, Yan Wang, Jiaqin Liu, Hongmei Zheng, Li Jin, Xinyi Zhang, Yong Zhang, Yucheng Wu
Developing suitable substrate materials is of significance in constructing electrochemical biosensors for fast and reliable quantification of molecules of chemical and biomedical interest. For practical applications, biosensors working at low negative potentials have the advantage of high selectivity and sensitivity. In this work, CeO2-x/C/rGO nanocomposites have been synthesized through the pyrolysis of metal organic frameworks with graphene oxide. The CeO2-x/C/rGO nanocomposites exhibit excellent catalytic properties towards H2O2, which is one of the uricase catalyzed intermediates at low working potentials due to the coexistence of Ce3+ and reduced graphene oxide (rGO)...
January 10, 2018: Nanoscale
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