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Metal–Organic Frameworks

Liang Zhao, Muhammad R Azhar, Xiaojie Li, Xiaoguang Duan, Hongqi Sun, Shaobin Wang, Xiangchen Fang
Cerium is an important rare earth element (REE), which can be used for many high-tech applications. From the industrial and environmental viewpoints, it is imperative to recover Ce3+ ions from aqueous solution. Herein, HKUST-1 metal-organic framework (MOF) was applied for adsorption and recovery of Ce3+ from aqueous solution. HKUST-1 showed a high adsorption efficiency and remarkable capacity of 353 mg/g at pH = 6. The isotherm, kinetics, effect of pH value and adsorption mechanism of the Ce3+ adsorption process were also studied...
January 31, 2019: Journal of Colloid and Interface Science
Junyi Wang, Yucheng Li, Zhimin Lv, Yi Xie, Junjie Shu, Ahmed Alsaedi, Tasawar Hayat, Changlun Chen
A novel composite of zeolitic imidazolate framework grown on graphene oxide (ZIF-8@GO) was successfully prepared and used for the adsorption of Pb(II) and 1-naphthylamine from aqueous solutions. The effects of contact time, pH, ionic strength and temperature on the adsorption performance of ZIF-8@GO was investigated by batch experiments. Compared to the bare ZIF-8 and GO, the ZIF-8@GO exhibited a significant increase in the adsorption for Pb(II) and 1-naphthylamine. The maximum adsorption capacities of ZIF-8@GO towards Pb(II) and 1-naphthylamine reached 356...
February 11, 2019: Journal of Colloid and Interface Science
Ibrahim Nasser Ahmed, Xiu-Li Yang, Amare Aregahegn Dubale, Rong Shao, Rong-Feng Guan, Xiangming Meng, Ming-Hua Xie
Metal-organic framework (MOF) assisted hydrothermal pretreatment and co-catalysis strategy based on UiO-66 MOF is developed for the first time. The Planetree exfoliating bark was pretreated with or without UiO-66 assisted hydrothermal method at a temperature ranging from 160 to 240 °C for 1-3 h residence. With the rise of pretreatment severity, the total reducing sugar (TRS) was increased till reached maximum, 180 mg g-1 , in the presence of UiO-66. The fitting models validate the optimal hydrothermal condition was at 180 °C and 1 h, which was characterized with high TRS and very low yield of furfural and HMF...
February 8, 2019: Bioresource Technology
Shuisheng Hu, Lin Zhu, Cheong Wing Lam, Longhua Guo, Zhenyu Lin, Bin Qiu, Kwok Yin Wong, Guonan Chen, Zhenhua Liu
A copper(II)-based two-dimensional metal-organic framework with nanosheet structure (CuBDC NS) that possesses peroxidase (POx) mimicking activity was prepared. In the presence of hydrogen peroxide, the system catalyses the oxidation of terephthalic acid to a blue-fluorescent product (excitation = 315 nm; emission = 425 nm). Pyrophosphate has a very strong affinity for Cu2+ ion and blocks the POx-mimicking activity of the CuBDC NS. If, however, inorganic pyrophosphatase is present, the POx mimicking activity is gradually restored because pyrophosphate is hydrolyzed...
February 15, 2019: Mikrochimica Acta
Baozhong Lü, Yifa Chen, Pengyu Li, Bo Wang, Klaus Müllen, Meizhen Yin
Radical anions of electron-deficient systems are widely used, but are easily reoxidized upon exposure to air. Therefore, the stabilization of radical anions under ambient conditions is of great significance, but still remains a scientific challenge. Herein, perylenediimide is employed to prepare a crystalline metal-organic framework for stabilizing radical anions without extensive chemical modification. The porous, three-dimensional framework of perylenediimide can trap electron donors such as amine vapors and produce radical anions in-situ through photo-induced electron transfer...
February 15, 2019: Nature Communications
Fernando Maya, Brett Paull
This review summarizes recent development made in the incorporation of functional materials into organic polymer monoliths, together with new monolithic forms and formats, which enhance their application as supports and stationary phase materials for sample preparation and chromatographic separations. While polymer monoliths are well known supports for the separation of large molecules, recent development have been made to improve their features for the separation of small molecules. The selectivity and performance of organic polymer monoliths has been improved by the incorporation of different materials, such as metal-organic frameworks, covalent organic frameworks, or other types of nanostructured materials (carbon nanohorns, nanodiamonds, polyoxometalates, layered double hydroxides, or attapulgite)...
February 15, 2019: Journal of Separation Science
Providencia González-Hernández, Ana B Lago, Jorge Pasán, Catalina Ruiz-Pérez, Juan H Ayala, Ana M Afonso, Verónica Pino
The pillared-layer Zn-triazolate metal-organic framework (CIM-81) was synthesized, characterized, and used for the first time as a sorbent in a dispersive micro-solid phase extraction method. The method involves the determination of a variety of personal care products in wastewaters, including four preservatives, four UV-filters, and one disinfectant, in combination with ultra-high performance liquid chromatography and UV detection. The CIM-81 MOF, constructed with an interesting mixed-ligand synthetic strategy, demonstrated a better extraction performance than other widely used MOFs in D-µSPE such as UiO-66, HKUST-1, and MIL-53(Al)...
February 15, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Arezou Taghvimi, Ahad Bavili Tabrizi, Siavoush Dastmalchi, Yousef Javadzadeh
Carboxylated carbon porous adsorbent was derived from zeolite imidazole framework (ZIF-8) via carbonization of ZIF-8 under a nitrogen atmosphere. The synthesized carboxylated adsorbent was fully characterized by various techniques including Fourier transform spectroscopy (FTIR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and zeta potential analysis. The carboxylated adsorbent was applied as dispersive solid phase extraction (DSPE) adsorbent for efficient extraction of methamphetamine (MET) from biological urine samples...
February 7, 2019: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Yang Liu, Zhijie Chen, Gongping Liu, Youssef Belmabkhout, Karim Adil, Mohamed Eddaoudi, William Koros
Membrane-based separation is poised to reduce the operation cost of propylene/propane separation; however, identifying a suitable molecular sieve for membrane development is still an ongoing challenge. Here, the successful identification and use of a metal-organic framework (MOF) material as fillers, namely, the Zr-fum-fcu-MOF possessing an optimal contracted triangular pore-aperture driving the efficient diffusive separation of propylene from propane in mixed-matrix membranes are reported. It is demonstrated that the fabricated hybrid membranes display a high propylene/propane separation performance, far beyond the current trade-off limit of polymer membranes with excellent properties under industrial conditions...
February 15, 2019: Advanced Materials
Vasudeva Rao Bakuru, Marilyn DMello, Suresh Babu Kalidindi
Hydrogen is in limelight as an environmental benign alternative to fossil fuels from few decades. To bring the concept of hydrogen economy from academic labs to real world certain challenges needs to be addressed in the areas of hydrogen production, storage and its use in fuel cells. Crystalline metal-organic frameworks (MOFs) with unprecedented surface areas are considered as potential materials for addressing the challenges in all these three fronts. MOFs combine the diverse chemistry of molecular linkers with their ability to co-ordinate to metal ions and clusters...
February 15, 2019: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Xiaonan Gao, Ai-Yun Fu, Bo Liu, Jun-Cheng Jin, Long-Tao Dou, Li-Xia Chen
The reactions of 2-(4-pyridyl) thiazole-4-carboxylic acid (Hptca) and CuCl2 ·6H2 O have led to a novel 3D mixed-valence, four-copper-center, metal-organic framework (MOF) [Cu8 Cl2 (ptca)10 ·17H2 O] n (1). The topology analysis using ToposPro software package for 1 resulted in three chain-based topology types of sra (42 , 63 , 8), pcu (412 , 63 ), and dia (66 ) via choosing corresponding connection atoms as central atoms. The study indicates that connection atoms associated directly with multiple coordination centers are applicable to act as central atoms...
February 15, 2019: Inorganic Chemistry
Qiao-Guo Tan, Shunhua Lu, Rong Chen, Jinghe Peng
Salinity has considerable effects on the toxicity of metals in estuarine waters. The effects of salinity are manifold, making it difficult to summarize for risk assessments. In this study, we separated and quantified the multiple effects of salinity on cadmium (Cd) in a toxicokinetic-toxicodynamic framework. The estuarine clam, Potamocorbula laevis, was used as a model organism. Cd bioaccumulation was measured using a stable-isotope-tracer technique; in parallel, toxicity tests were conducted. With the increase of salinity from 5 to 30, Cd uptake decreased monotonically...
February 15, 2019: Environmental Science & Technology
Cong Wang, Yang-Hui Luo, Xiao-Tong He, Dan-Li Hong, Jia-Ying Wang, Fang-Hui Chen, Chen Chen, Bai-Wang Sun
The design and preparation of a porous high-valence metal-organic framework (MOF) featuring open coordination sites are of utmost importance for the development of adsorbent materials. Here in this work, the three-dimensional (3D) high-valence MOF [Er(dcbp)3/2 (DMF)(H2 O)2 ]·2H2 O (HV-MOF-1; H2 dcbp = 4,4'-dicarboxy-2,2'-bipyridine, DMF = N,N-dimethylformamide), which possesses permanent porosity and two open coordination sites, has been prepared and characterized. In the 3D framework, the dcbp molecules display two different bridging styles, resulting in ordered diamondlike pores with bared carboxyl oxygen and pyridine nitrogen atoms on dcbp exposed directly to the pores, generating hydrophilic characteristics and high water affinity...
February 15, 2019: Inorganic Chemistry
Sarah L Griffin, Claire Wilson, Ross S Forgan
Metal-organic frameworks (MOFs)-network structures built from metal ions or clusters and connecting organic ligands-are typically synthesized by solvothermal self-assembly. For transition metal based MOFs, structural predictability is facilitated by control over coordination geometries and linker connectivity under the principles of isoreticular synthesis. For rare earth (RE) MOFs, coordination behavior is dominated by steric and electronic factors, leading to unpredictable structures, and poor control over self-assembly...
2019: Frontiers in Chemistry
Yuanzhi He, Wei Zhang, Tao Guo, Guoqing Zhang, Wei Qin, Liu Zhang, Caifen Wang, Weifeng Zhu, Ming Yang, Xiaoxiao Hu, Vikramjeet Singh, Li Wu, Ruxandra Gref, Jiwen Zhang
Tremendous efforts have been devoted to the enhancement of drug solubility using nanotechnologies, but few of them are capable to produce drug particles with sizes less than a few nanometers. This challenge has been addressed here by using biocompatible versatile γ -cyclodextrin ( γ -CD) metal-organic framework (CD-MOF) large molecular cages in which azilsartan (AZL) was successfully confined producing clusters in the nanometer range. This strategy allowed to improve the bioavailability of AZL in Sprague-Dawley rats by 9...
January 2019: Acta Pharmaceutica Sinica. B
Xu-Jia Hong, Chun-Lei Song, Yan Yang, Hao-Chong Tang, Guo-Hui Li, Yue-Peng Cai, Hongxia Wang
In this work, we demonstrate cerium (Ce) based metal-organic-frameworks (MOFs) combined with carbon nanotubes (CNTs) to form Ce-MOF/CNT composites as separator coating material in Li-S battery system, which showed excellent electrochemical performance even under high sulfur loading, and much better capacity retention. At the sulfur loading of 2.5 mg/cm2, initial specific capacity of 1021.8 mAh/g at 1C was achieved in the Li-S cell with the Ce-MOF-2/CNT coated separator, which was slowly reduced to 838.8 mAh/g after 800 cycles with a decay rate of only 0...
February 14, 2019: ACS Nano
Darren M Driscoll, Diego Troya, Pavel M Usov, Andrew J Maynes, Amanda J Morris, John R Morris
The metal-organic framework (MOF), UiO-66, contains Brønsted acidic and Lewis acidic sites that play an important role in sorption, separation, and potential catalytic processes involving small gaseous molecules. As such, studies into the sequestration and separation of CO within UiO-66 provides a fundamental understanding of small gas molecule adsorption within a highly porous, tunable and environmentally stable MOF. Infrared spectroscopic measurements, in combination with density functional theory, were employed to characterize the binding energetics between bridging hydroxyl groups at MOF nodes and the adsorbate, CO...
February 14, 2019: Physical Chemistry Chemical Physics: PCCP
Shing Bo Peh, Youdong Cheng, Jian Zhang, Yuxiang Wang, Ger Hui Chan, Jian Wang, Dan Zhao
The synthesis of chemically stable metal-organic frameworks (MOFs) in benign solvents is a key step towards their scalable production and commercialization. Extending the modulated hydrothermal (MHT) synthesis approach for zirconium (Zr) MOFs, we herein demonstrate cluster nuclearity control over the secondary building units (SBUs) to target Zr6-based and Zr12-based phases for the Zr terephthalate (Zr-BDC) system. Different functional groups (-NH2, -NO2, -Br, -F4) can be incorporated into Zr12-BDC, providing an avenue to further tune the chemical properties of these promising MOFs...
February 14, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Gao-Peng Li, Kun Zhang, Peng-Feng Zhang, Wei-Ni Liu, Wen-Quan Tong, Lei Hou, Yao-Yu Wang
Owing to the rapid increase of Hg(II) ions in water resources, the design and development of new adsorbents for Hg(II) removal are becoming a significant challenge in environmental protection. Herein, a thiol-functionalized metal-organic framework (SH-MiL-68(In)) was successfully prepared through a post-synthesis modification procedure, and the framework intactness and porosity were well maintained after this process. SH-MiL-68(In) exhibited selective adsorption performance for Hg(II) ions in water. Meanwhile, SH-MiL-68(In) also shows a high adsorption capacity (450 mg g-1 ), large adsorption rate (rate constant k2 = 1...
February 14, 2019: Inorganic Chemistry
Abebu A Kassie, Pu Duan, Eric T McClure, Klaus Schmidt-Rohr, Patrick M Woodward, Casey R Wade
A Zr metal-organic framework (MOF) 1-CoCl3 has been synthesized by solvothermal reaction of ZrCl4 with a carboxylic acid-functionalized CoIII -PN NN P pincer complex H4 (L-CoCl3 ) ([L-CoCl3 ]4- = [(2,6-(NHPAr2 )2 C6 H3 )CoCl3 ]4- , Ar = p-C6 H4 CO2 - ). The structure of 1-CoCl3 has been determined by X-ray powder diffraction and exhibits a csq topology that differs from previously reported ftw-net Zr MOFs assembled from related PdII - and PtII -PN NN P pincer complexes. The Co-PN NN P pincer species readily demetallate upon reduction of CoIII to CoII , allowing for transmetalation with late second and third row transition metals in both the homogeneous complex and 1-CoCl3 ...
February 14, 2019: Inorganic Chemistry
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