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PubMed Journals Articles About "Highly Water Stable Imidazole Based MOFs Sensing Water" RSS

03:14 EST 28th February 2020 | BioPortfolio

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Showing "Highly Water Stable Imidazole Based MOFs Sensing Water" PubMed Articles 1–25 of 48,000+

Two Highly Water-Stable Imidazole-Based Ln-MOFs for Sensing Fe,CrO/CrO in a Water Environment.

Developing highly stable materials for harmful ion detection in a water environment is of much importance and challenging. Here, two three-dimensional porous structures (termed as Eu-MOF and Tb-MOF) were successfully constructed by the strategy of anchoring Eu/Tb and rigid 1,2,4,5-benzenetetracarboxylic acid (HBTEC) imidazole units (HICA) onto its frameworks. The obtained Eu-MOF and Tb-MOF display high water stability and fluorescence stability up to 30 days. Furthermore, luminescent studies reveal that Eu-...


Water-stable adenine-based MOFs with polar pores for selective CO2 capture.

Here, we report two novel water-stable amine-functionalized MOFs, namely IISERP-MOF26 ([NH2(CH3)2][Cu2O(Ad)(BDC)]•(H2O)2(DMA), 1) and IISERP-MOF27 ([NH2(CH3)2]1/2[Zn4O(Ad)3(BDC)2]•(H2O)2(DMF)1/2, 2), which show selective CO2 capture capabilities. They are made by combining inexpensive and readily available terephthalic acid and N-rich adenine with Cu and Zn, respectively. They possess 1-D channels decorated by the free amine group from the adenine and the polarizing oxygen atoms from the terephthalate...

Selective capture of toxic oxoanions of Se(VI) and As(V) with a rare crystallographic insight by a water stable ionic MOF.

Selectively capturing toxic oxoanions of selenium (Se) and arsenic (As) is highly desired for the remediation of hazardous waste. Ionic metal-organic frameworks (iMOFs) especially cationic MOFs (iMOF-C) as ion-exchange materials, featuring aqueous phase stability, present a robust pathway for sequesteration of aforementioned anions due to no leaching associated with its inherent ionic nature. Owing to the scarcity of water stable cationic MOFs, capture of oxoanions of selenium and arsenic has been a major c...


Highly Stable Zinc-based Metal-Organic Frameworks and Corresponding Flexible Composites for Removal and Detection of Antibiotics in Water.

Antibiotic contamination of water bodies is a major environmental concern. Exposure to superfluous antibiotics is an ecological stressor correlated to the development of antibiotic resistance. Thus, it is imperative that effective methods are developed to simultaneously detect and remove such antibiotics so as to avoid inadvertent release. Herein, two flexible three-dimensional (3D) Zinc-based metal-organic frameworks (MOFs) {[Zn2(bcob)(OH)(H2O)]·DMA}n (ROD-Zn1) and {[Zn(Hbcob)]·(solvent)}n (ROD-Zn2) (H3b...

Short-Range Order and Transport Properties in Mixtures of the Protic Ionic Liquid CHImTFSI with Water or Imidazole.

In this study we investigate the effect of adding different molecular cosolvents, water or imidazole, to the protic ionic liquid 1-ethylimidazolium bis(trifluoromethanesulfonyl)-imide, i.e. [C2HIm][TFSI]. We explore how the added cosolvent distributes within the ionic liquid by means of molecular dynamics simulations and x-ray scattering. We also analyse the degree of short range heterogeneity in the resulting mixtures, finding that while imidazole easily mixes with the protic ionic liquid, water tends to f...

Metal-Organic Frameworks for the Removal of Emerging Organic Contaminants in Water.

Water is essential in all aspects of life, being the defining characteristic of our planet and even our body. Regrettably, water pollution is increasingly becoming a challenge due to novel anthropogenic pollutants. Of particular concern are emerging organic contaminants (EOCs), the term used not only to cover newly developed compounds but also compounds newly discovered as contaminants in the environment. Aside from anthropogenic contamination, higher temperature and more extreme and less predictable weathe...

Devising Chemically Robust and Cationic Ni(II)-MOF with Nitrogen-Rich Micropores for Moisture Tolerant CO Capture: Highly Regenerative and Ultra-Fast Colorimetric Sensor for TNP and Multiple Oxo-Anions in Water with Theoretical Revelation.

Metal-organic frameworks (MOFs) show distinctive superiority for carbon dioxide (CO) capture and luminescent sensing of toxic pollutants over other materials, where combination of both these properties together with improvement of hydrolytic stability and pore functionality is critical to environmental remediation applications. The Ni(II)-framework, [Ni(µ-OH)()()](NO)⋅6DMA⋅6MeOH () ( = 4,4',4''-(1H-imidazole-2,4,5-triyl)tripyridine, H = azobenzene-4,4'-dicarboxylic acid, DMA = Dimethylacetamide, CSMCRI...

Thiophenol detection using an AIE fluorescent probe through self-assembly with TPE-based glycoclusters.

We describe a novel green-emitting tetraphenylethylene-dicyanomethylene-4H-pyran (TPE-DCM) based fluorescent probe (TD-1). Conjugating TPE and DCM moieties allowed TD-1 to display high selectivity for thiophenol with excellent AIE properties in aqueous solution. Nevertheless, the poor water solubility of the hydrophobic structure resulted in a weak and unstable emission intensity. The non-covalent self-assembly of TD-1 with a TPE glycocluster (TPE2S) led to a largely improved water solubility producing a re...

Evaluation of organic migration and biomass formation on polymeric components in a point-of-use water dispenser.

To minimize the aesthetic and hygienic concerns regarding tap water (e.g., odor, taste, suspended solids, and microorganisms), point-of-use (POU) water dispensers and filters are used in households worldwide. However, the POU water dispenser itself can adversely impact water quality. This study investigated the bacterial growth through a POU water dispenser fed with chlorinated tap water; specifically, the heterotrophic plate count increased from 0.01 to 20.01 × 10 of colony-forming units per ml. The B...

Remote sensing and modeling fusion for investigating the ecosystem water-carbon coupling processes.

The water and carbon cycles are tightly linked and play a key role in the material and energy flows between terrestrial ecosystems and the atmosphere, but the interactions of water and carbon cycles are not quite clear. The global climate change and intensive human activities could also complicate the water and carbon coupling processes. Better understanding the coupled water-carbon cycles and their spatiotemporal evolution can inform management and decision-making efforts regarding carbon uptake, food prod...

Broad spectrum detection of veterinary drugs with a highly stable metal-organic framework.

The broad spectrum detection of veterinary drugs is very important for rapid and large-scale safe screen of animal-derived foods. Metal-organic frameworks (MOFs), as a kind of emerged functional porous materials are quite promising in the chemical sensing and molecular detection. In this work, we report the high-performance broad spectrum detection of 15 commonly-used veterinary drugs through the fluorescence quenching in a newly-designed chemically stable Al-based MOF, Al(μ-O)(OH)(HO)(PPTTA) (BUT-22). To ...

Assessing the impact of source water on tap water bacterial communities in 46 drinking water supply systems in China.

Drinking water purification and distribution processes shape the bacterial community in tap water; however, this study calls attention to the impact of source water on tap water bacterial community. Herein, paired source and tap water samples were collected from 46 drinking water supply systems in different watersheds across China, and high-throughput sequencing delineated that bacterial richness and diversity decreased and biogeographical distribution pattern weakened in tap water compared to source water....

Series of Water-Stable Lanthanide Metal-Organic Frameworks Based on Carboxylic Acid Imidazolium Chloride: Tunable Luminescent Emission and Sensing.

A series of isomorphic lanthanide metal-organic frameworks (Ln-MOFs), {[Ln(L)(HO)]·5HO} (, where Ln = Eu, Tb, Gd, and EuTb), have been synthesized by a rigid 1,3-bis(3,5-dicarboxyphenyl)imidazolium chloride (HLCl) ligand and Ln ions via a solvothermal method. Single-crystal X-ray diffraction indicated that exhibited similar three-dimensional porous frameworks with one-dimensional channels decorated by the uncoordinated carboxylate oxygen atoms. The luminescent sensing studies indicated that is an outstan...

Ultrahigh Proton Conduction in Two Highly Stable Ferrocenyl Carboxylate Frameworks.

Nowadays, although the research of proton conductive materials has been extended from traditional sulfonated polymers to novel crystalline solid materials such as MOFs, COFs, and HOFs, the research on crystalline ferrocene-based carboxylate materials is very limited. Herein, we selected two hydrogen-bonded and - interactions supported ferrocenyl carboxylate frameworks (FCFs), [FcCO(CH2)2COOH] (FCF 1) and [FcCOOH] (FCF 2) (Fc = (5-C5H5)Fe(5-C5H4)) to fully investigate their water-mediated proton ...

Cyclometalated Ir-Zr-MOFs as Recyclable Visible-Light Photocatalysts for Sulfide Oxidation into Sulfoxide in Water.

Aerobic photo-oxidation of sulfide into sulfoxide in water is of great interest in synthesis chemistry. In this study, three high stable Ir(III)-Zr(IV) metal-organic frameworks (Ir-Zr-MOFs), namely Zr6-Irbpy (bpy is 2,2'-bipyridine), Zr6-IrbpyOMe (bpyOMe is 4,4'-dimethoxy-2,2'-bipyridine), and Zr6-Irphen (phen is 1,10-phenanthroline), are constructed by using [Ir(pqc)2(L)2]Cl complexes (where pqc is 2-phenylquinoline-4-carboxylic acid, L is an ancillary ligand bpy, bpyOMe or phen) as linkers and Zr6 cluster...

Acceleration of chemical shift encoding-based water fat MRI for liver proton density fat fraction and T2* mapping using compressed sensing.

To evaluate proton density fat fraction (PDFF) and T2* measurements of the liver with combined parallel imaging (sensitivity encoding, SENSE) and compressed sensing (CS) accelerated chemical shift encoding-based water-fat separation.

Highly sensitive and selective fluorescent detection of phosphate in water environment by a functionalized coordination polymer.

Phosphate, due to its somatotrophic effect on organisms, can cause severe eutrophication with excessive content in water. Conventional methods for phosphate detection, which are based on complicated instruments, are time-consuming. Here we report a luminescent lanthanide functionalized coordination polymer (Eu@BUC-14) by doping Eu cations to BUC-14 nanocrystals. This Eu functionalized hybrid (Eu@BUC-14) presents excellent luminescence features of Eu ion that originated from efficient energy transfer from th...

Facile Bottom-up Preparation of WS-Based Water-Soluble Quantum Dots as Luminescent Probes for Hydrogen Peroxide and Glucose.

Photoluminescent zero-dimensional (0D) quantum dots (QDs) derived from transition metal dichalcogenides, particularly molybdenum disulfide, are presently in the spotlight for their advantageous characteristics for optoelectronics, imaging, and sensors. Nevertheless, up to now, little work has been done to synthesize and explore photoluminescent 0D WS QDs, especially by a bottom-up strategy without using usual toxic organic solvents. In this work, we report a facile bottom-up strategy to synthesize high-qual...

Detection of humic acid in water using flat-sheet and folded-rod viscous alkaline glucose syrups.

The utility of a low-cost biocompatible material for the detection of pollutants in water is highly essential to ensure safety and economic efficiency. In this paper, solutions of two viscous alkaline glucose syrups (AGS@22-sheet and AGS@60-rod), obtained under two different temperature conditions (22 °C and 60 °C) were used to detect low levels of humic acid (HA), a carcinogen pro-molecule and metal-complexing agent in an aqueous solution. The AGS materials were characterized using ultraviolet-visible sp...

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range.

The huge amount of moisture in the air is an unexplored and overlooked water resource in nature, which can be useful to solve the worldwide water shortage. However, direct water condensation from natural or even hazy air is always inefficient and inevitably contaminated by numerous impurities of dust, toxic gas, and microorganisms. In this regard, a drinkable and clean water harvester from complex contaminated air with a wide humidity range based on porous sodium polyacrylate/graphene framework (PGF), which...

Enhanced proton conduction of imidazole localized in one-dimensional Ni-metal-organic framework nanofibers.

Metal-organic frameworks (MOFs) show possibilities to be potential candidates for proton exchange membranes (PEMs). However, the poor flexibility and processability of MOFs due to their crystalline nature limit their applications significantly. An efficient approach to overcome this limitation is to combine MOFs with polymers. In this work, novel lightweight and flexible Ni-MOFs/polyacrylonitrile nanofibers were fabricated by electrospinning. The nanofibers consisted of one-dimensional proton conduction cha...

Nanoscale Dynamics and Transport in Highly-Ordered Low Dimensional Water.

Highly ordered and highly cooperative water with properties of both solid and liquid states has been observed by means of neutron scattering in hydrophobic one-dimensional channels with van der Waals diameter of 0.78 nm. We have found that in initial stages of adsorption water molecules occupy niches close to pore walls, followed later by the filling of the central pore area. Intensified by confinement intermolecular water interactions lead to the formation of well-ordered hydrogen-bonded water chains and t...

A Hybrid Organic-Inorganic Gel Electrocatalyst for Stable Acidic Water Oxidation.

Water oxidation catalysts (WOCs) are essential to electrochemical hydrogen production, but (electro)chemical instability remains a critical issue for WOCs especially under acidic conditions. Here we present a hybrid organic-inorganic polymeric dual network gel (DN gel) electrocatalyst based on earth-abundant elements via in-situ oxidative polymerization of polypyrrole and simultaneous cyano-polymerization for efficient acidic water oxidation. X-ray absorption and X-ray photoelectron spectra reveal a synergi...

Self-Supportive Mesoporous Ni/Co/Fe Phosphosulfide Nanorods Derived from Novel Hydrothermal Electrodeposition as a Highly Efficient Electrocatalyst for Overall Water Splitting.

Low cost and highly efficient bifuctional catalysts for overall water electrolysis have drawn considerable interests over the past several decades. Here, rationally synthesized mesoporous nanorods of nickel-cobalt-iron-sulfur-phosphorus composites are tightly self-supported on Ni foam as a high-performance, low cost, and stable bifunctional electrocatalyst for water electrolysis. The targeted designing and rational fabrication give rise to the nanorod-like morphology with large surface area and excellent co...

A pure-supramolecular-linker approach to highly connected metal-organic frameworks for CO2 capture.

A pure-supramolecular-linker (PSL) approach for the formation of MOFs was initially given, which was demonstrated by syntheses of two highly connected and isostructural MOFs, {Fe3O(TPBTM6-)(Cl)(H2O)2}∞ (TPBTM = N,N',N''-tris(isophthalyl)-1,3,5-benzenetricarboxamide) (NJU-Bai52, NJU-Bai for Nanjing University Bai group) and {Sc3O(TPBTM6-)(OH)(H2O)2}∞ (NJU-Bai53). Very interestingly, they exhibit exceptional thermal stability, water stability and highly selective CO2 capture properties. In particular, NJU...


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