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Mesoporous Metal Organic Framework

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https://read.qxmd.com/read/30744163/tunable-synthesis-of-mesoporous-carbons-from-fe%C3%A2-o-bdc-%C3%A2-for-chloramphenicol-antibiotic-remediation
#1
Thuan Van Tran, Duyen Thi Cam Nguyen, Hanh T N Le, Long Giang Bach, Dai-Viet N Vo, Seong Soo Hong, Tri-Quang T Phan, Trinh Duy Nguyen
Chloramphenicol (CAP) is commonly employed in veterinary clinics, but illegal and uncontrollable consumption can result in its potential contamination in environmental soil, and aquatic matrix, and thereby, regenerating microbial resistance, and antibiotic-resistant genes. Adsorption by efficient, and recyclable adsorbents such as mesoporous carbons (MPCs) is commonly regarded as a "green and sustainable" approach. Herein, the MPCs were facilely synthesized via the pyrolysis of the metal⁻organic framework Fe₃O(BDC)₃ with calcination temperatures ( x °C) between 600 and 900 °C under nitrogen atmosphere...
February 10, 2019: Nanomaterials
https://read.qxmd.com/read/30711322/a-solid-phase-microextraction-arrow-with-zirconium-metal-organic-framework-molybdenum-disulfide-coating-coupled-with-gas-chromatography-mass-spectrometer-for-the-determination-of-polycyclic-aromatic-hydrocarbons-in-fish-samples
#2
Yongli Yuan, Xiaoting Lin, Tianhua Li, Tianyu Pang, Youren Dong, Rongjie Zhuo, Qiqin Wang, Yuting Cao, Ning Gan
Solid phase microextraction (SPME) Arrows with enlarged sorption phases and Arrow-shaped tips are good alternatives to classic SPME fibers. Developing SPME Arrows with functionalized coatings has become a growing area of SPME research. In this study, a zirconium metal organic framework/molybdenum disulfide (UiO-66/MoS2 ) composite coating modified SPME Arrow was developed and coupled with gas chromatography-mass spectrometry for the headspace extraction and detection of 16 polycyclic aromatic hydrocarbons (PAHs)...
January 24, 2019: Journal of Chromatography. A
https://read.qxmd.com/read/30707840/exploiting-%C3%AF-%C3%AF-interactions-to-design-an-efficient-sorbent-for-atrazine-removal-from-water
#3
Isil Akpinar, Riki J Drout, Timur Islamoglu, Satoshi Kato, Jiafei Lyu, Omar K Farha
The United States Environmental Protection Agency (EPA) recognizes atrazine, a commonly used herbicide, as an endocrine disrupting compound. Excessive use of this agrochemical results in contamination of surface and ground water supplies via agricultural runoff. Efficient removal of atrazine from contaminated water supplies is paramount. Here, the mechanism governing atrazine adsorption in Zr6 -based metal-organic frameworks (MOFs) has been thoroughly investigated by studying the effects of MOF linkers and topology on atrazine uptake capacity and uptake kinetics...
February 1, 2019: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30689379/tuning-the-ionicity-of-stable-metal-organic-frameworks-through-ionic-linker-installation
#4
Jiandong Pang, Shuai Yuan, Jun-Sheng Qin, Christina Lollar, Ning Huang, Jialuo Li, Qi Wang, Mingyan Wu, Daqiang Yuan, Maochun Hong, Hong-Cai Zhou
The predictable topologies and designable structures of metal-organic frameworks (MOFs) are the most important advantages for this emerging crystalline material compared to traditional porous materials. However, pore-environment engineering in MOF materials is still a huge challenge when it comes to the growing requirements of expanded applications. A useful method for the regulation of pore-environments, linker installation, has been developed and applied to a series of microporous MOFs. Herein, employing PCN-700 and PCN-608 as platforms, ionic linker installation was successfully implemented in both microporous and mesoporous Zr-based MOFs to afford a series of ionic frameworks...
January 28, 2019: Journal of the American Chemical Society
https://read.qxmd.com/read/30685611/amino-modified-metal-organic-frameworks-as-ph-responsive-nanoplatforms-for-safe-delivery-of-camptothecin
#5
Alejandro Cabrera-García, Elisa Checa-Chavarria, Eva Rivero-Buceta, Victoria Moreno, Eduardo Fernández, Pablo Botella
MIL-100(Fe) and MIL-101(Fe) metal-organic frameworks (MOFs) are excellent vehicles for drug delivery systems (DDSs) due to their high biocompatibility and stability in physiological fluids, as well as their pore diameter in the mesoporous range. Although they are appropriate for the internal diffusion of 20-(S)-camptothecin (CPT), a strongly cytotoxic molecule with excellent antitumor activity, no stable delivery system has been proposed so far for this drug based in MOFs. We here present novel DDSs based in amine functionalized MIL-100(Fe) and MIL-101(Fe) nanoMOFs with covalently bonded CPT...
January 17, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30672555/polarity-assisted-formation-of-hollow-frame-sheathed-nitrogen-doped-nanofibrous-carbon-for-supercapacitors
#6
Yujiao Gong, Ruyi Chen, Hai Xu, Chenyang Yu, Xi Zhao, Yue Sun, Zengyu Hui, Jinyuan Zhou, Jianing An, Zhuzhu Du, Gengzhi Sun, Wei Huang
Heteroatom-doped carbon nanostructures with uniform size and morphology, well-designed architectures, and minimized interfacial resistance have been recognized as promising electrode materials for energy storage, but remain a crucial challenge. Herein, we develop a general approach of polarity-induced decoration of a monolayer sheath of metal-organic framework (MOF) particles with excellent uniformity in size and morphology on electrospun polymer nanofibers. These hybrid nanofibers are facilely converted into nitrogen-doped nanofibrous carbon (denoted as N-NFC) during pyrolysis...
January 23, 2019: Nanoscale
https://read.qxmd.com/read/30672537/unraveling-the-relationship-between-the-morphologies-of-metal-organic-frameworks-and-the-properties-of-their-derived-carbon-materials
#7
Qiao Wu, Jun Liang, Jun-Dong Yi, Dong-Li Meng, Peng-Chao Shi, Yuan-Biao Huang, Rong Cao
Metal-organic framework (MOF) derived carbon materials are promising for energy storage and conversion as they could inherit the advantages of MOF precursors, such as high porosity, large surface area and uniform heteroatom doping. Although the morphologies of MOF precursors have a significant effect on the properties of the resulting materials, up to now, there has been no systematic study on the relationship of the morphologies of MOFs and the properties of their pyrolized carbonaceous materials. Herein, three isomorphous imidazolate-based ZIF-7 materials with different morphologies (sphere, polyhedron and rod shape) have been selected as precursors and carbonized to obtain porous N-doped carbon materials with a tunable morphology, pore features and surface areas...
January 23, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/30648784/needs-and-gaps-for-catalysis-in-addressing-transitions-in-chemistry-and-energy-from-a-sustainability-perspective
#8
REVIEW
Gabriele Centi, Jiří Čejka
Catalysis is undergoing a major transition resulting from significant changes in chemical and energy production. To honor the 50th anniversary of establishing the Jerzy Haber Institute of Catalysis and Surface Chemistry, this Essay discusses, from a forward-looking, personal and somewhat provocative perspective, the needs and gaps of catalysis to address the ongoing transition in chemistry and energy from a sustainability perspective. The focus is on a few selected aspects identified as crucial: i) The precise synthesis of catalytic materials, particularly focusing on mesoporous molecular sieves, metal-organic frameworks, and zeolites (particularly two-dimensional type); ii) advanced catalyst characterization methods; iii) new concepts and approaches needed in catalysis to meet the demands of a field of energy and chemistry in transition...
January 16, 2019: ChemSusChem
https://read.qxmd.com/read/30640459/direct-imaging-of-isolated-single-molecule-magnets-in-metal-organic-frameworks
#9
Darpandeep Aulakh, Lingmei Liu, Juby R Varghese, Haomiao Xie, Timur Islamoglu, Kyle Duell, Chung-Wei Kung, Chia-En Hsiung, Yuxin Zhang, Riki J Drout, Omar K Farha, Kim R Dunbar, Yu Han, Mario Wriedt
Practical applications involving the magnetic bistability of single-molecule magnets (SMMs) for next-generation computer technologies require nanostructuring, organization and protection of nanoscale materials in two- or three-dimensional networks, to enable read-and-write processes. Owing to their porous nature and structural long-range order, metal-organic frameworks (MOFs) have been proposed as hosts to facilitate these efforts. Although probing the channels of MOF composites using indirect methods is well established, the use of direct methods to elucidate fundamental structural information is still lacking...
January 14, 2019: Journal of the American Chemical Society
https://read.qxmd.com/read/30637791/zno-nanosheets-abundant-in-oxygen-vacancies-derived-from-metal-organic-frameworks-for-ppb-level-gas-sensing
#10
Hongye Yuan, Saif Abdulla Ali Alateeqi Aljneibi, Jiaren Yuan, Yuxiang Wang, Hui Liu, Jie Fang, Chunhua Tang, Xiaohong Yan, Hong Cai, Yuandong Gu, Stephen John Pennycook, Jifang Tao, Dan Zhao
Surmounting the inhomogeniety issue of gas sensors and realizing their reproducible ppb-level gas sensing are highly desirable for widespread deployments of sensors to build networks in applications of industrial safety and indoor/outdoor air quality monitoring. Herein, a strategy is proposed to substantially improve the surface homogeneity of sensing materials and gas sensing performance via chip-level pyrolysis of as-grown ZIF-L (ZIF stands for zeolitic imidazolate framework) films to porous and hierarchical zinc oxide (ZnO) nanosheets...
January 13, 2019: Advanced Materials
https://read.qxmd.com/read/30625415/merging-metal-organic-framework-with-hollow-organosilica-nanoparticles-as-a-versatile-nanoplatform-for-cancer-theranostics
#11
Liang Chen, Jiulong Zhang, Xiaojun Zhou, Shuguang Yang, Qianqian Zhang, Weizhong Wang, Zhengwei You, Chen Peng, Chuanglong He
With great potential in nanomedicine, the integration of a metal organic framework (MOF) with a nanocarrier for smart and versatile cancer theranostics still seeks to expand. In this study, MOF was successfully merged with hollow mesoporous organosilica nanoparticles (HMONs) with a polydopamine (PDA) interlayer to form molecularly organic/inorganic hybridized nanocomposites (HMONs-PMOF). The well-defined nanostructure and favorable biocompatibility of HMONs-PMOF were demonstrated first. Doxorubicin hydrochloride (DOX) and indocyanine green (ICG) were separately loaded into the interior cavity of HMONs and the outer porous shell of MOF with high loading efficacy, respectively...
January 6, 2019: Acta Biomaterialia
https://read.qxmd.com/read/30614680/controlled-manipulation-of-mofs-layers-to-nanometer-precision-inside-large-meso-channels-of-ordered-mesoporous-silica-for-enhanced-removal-of-bisphenol-a-from-water
#12
Junyu Peng, Yun Li, Xiaoli Sun, Chaonan Huang, Jing Jin, Jincheng Wang, Jiping Chen
Considerable attention has been endeavored on the design of hierarchical porous metal-organic framework (MOF) composites, which not only enhances the performance but also broadens the applications of MOFs. So far, controlled manipulation of nanometer-thick MOF layers in ordered meso-channels while retaining their respective intrinsic properties is still a main challenge, due to the difficulty of growing MOFs in confined space. Herein, using a step-by-step coordination method, the formation of a hierarchical micro-mesoporous hybrid with wall (channel wall and coating layer) thickness up to 8...
January 7, 2019: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30574965/a-mesoporous-nnn-pincer-based-metal-organic-framework-scaffold-for-the-preparation-of-noble-metal-free-catalysts
#13
Yingmu Zhang, Jialuo Li, Xinyu Yang, Peng Zhang, Jiandong Pang, Bao Li, Hong-Cai Zhou
Through topology-guided synthesis, a Zr-based mesoporous MOF was successfully constructed, adopting a β-cristobalite-type structure. The MOF is embedded with well-arranged terpyridine coordination sites for facile post-synthetic metalation, and can be effectively used as a general scaffold for the preparation of noble-metal-free catalysts. For instance, the scaffolded metal@MOF material exhibits highly efficient catalytic activity for alkene epoxidation and arene borylation.
December 21, 2018: Chemical Communications: Chem Comm
https://read.qxmd.com/read/30567645/bimetallic-cerium-copper-organic-framework-derived-cerium-and-copper-oxides-embedded-by-mesoporous-carbon-label-free-aptasensor-for-ultrasensitive-tobramycin-detection
#14
Shijun Wang, Zhenzhen Li, Fenghe Duan, Bin Hu, Linghao He, Minghua Wang, Nan Zhou, Qiaojuan Jia, Zhihong Zhang
We reported a novel bimetallic cerium/copper-based metal organic framework (Ce/Cu-MOF) and its derivatives pyrolyzed at different temperatures, followed by exploiting them as the scaffold of electrochemical aptamer sensors for extremely sensitive detection of trace tobramycin (TOB) in human serum and milk. After the calcination at high temperature, the meal coordination centers (Ce and Cu) were transferred to metal oxides containing various chemical valences, such as Ce(III), Ce(IV), Cu(II) and Cu(0), which were embedded within the mesoporous carbon network originated from the organic ligands (represented by CeO2 /CuOx @mC)...
January 24, 2019: Analytica Chimica Acta
https://read.qxmd.com/read/30543212/customized-mesoporous-metal-organic-frameworks-engender-stable-enzymatic-nanoreactors
#15
Liwen Zhang, Walaa Baslyman, Peng Yang, Niveen M Khashab
Here, the porosity of a metal organic framework (MIL-101) is tailored by the choice of the solvent occupying the pores in a template free acid etching process. Employing a slightly basic solvent such as DMF afforded big pores around 30 nm (BP-MIL-101). Catalase (CAT), which is a large protein (6 × 10 nm), was successfully encapsulated by a diffusion-based method with a high capacity of 12.5%. BP-MIL-101 could successfully protect CAT from both digestion and denaturation while maintaining its catalytic activity...
December 13, 2018: Chemical Communications: Chem Comm
https://read.qxmd.com/read/30525403/isolated-%C3%AF-interaction-sites-in-mesoporous-mof-backbone-for-repetitive-and-reversible-dynamics-in-water
#16
Xiaohui Xu, Shenhui Li, Qi Liu, Zhiyu Liu, Wei Yan, Ligong Zhao, Wenhao Zhang, Liang Zhang, Feng Deng, Hengjiang Cong, Hexiang Deng
We reported the introduction of π-interaction sites into a series of chemically robust metal-organic frameworks (MOFs), MOF-526, -527 and -528 with progressively increased pore size, 1.9 nm to 3.7 nm, and the inclusion and release of large organic molecules in water. The mesopores in these MOFs leads to fast adsorption kinetics, while the π-interaction between isolated porphyrin units in MOF backbone and polycyclic structure of the organic guests provides excellent reversibility. Specifically, seven large organic dyes are quantitatively captured by the porphyrin units of these MOFs in a 2:1 molar ratio, and exhibiting unprecedented kinetics for MOFs [e...
December 10, 2018: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30513441/adsorption-desorption-kinetics-and-breakthrough-of-gaseous-toluene-for-modified-microporous-mesoporous-uio-66-metal-organic-framework
#17
Xiaodong Zhang, Yang Yang, Xutian Lv, Yuxin Wang, Ning Liu, Dan Chen, Lifeng Cui
In this work, micro-mesoporous UiO-66 was successfully prepared with P123 (EO20 PO70 EO20 ) as structure-directing agent by a simple solvothermal method. Adsorption/desorption kinetics of gaseous toluene over pristine UiO-66 and micro-mesoporous UiO-66 were investigated by breakthrough experiments, toluene vapor adsorption isotherm measurements and temperature programmed desorption (TPD) experiments. The interactions between toluene and UiO-66 samples were assessed through the Henry's law constant (KH ) and the isosteric adsorption heat (ΔHads )...
November 26, 2018: Journal of Hazardous Materials
https://read.qxmd.com/read/30474024/encapsulation-of-metal-nanoparticle-catalysts-within-mesoporous-zeolites-and-their-enhanced-catalytic-performances-a-review
#18
REVIEW
Dongdong Xu, Hao Lv, Ben Liu
Metal nanoparticles (NPs) exhibit desired activities in various catalytic reactions. However, the aggregation and sintering of metal NPs usually cause the loss of catalytic performance in practical reaction processes. Encapsulation of catalytically active metal NPs on/within a high-surface-area inorganic support partially resolve such concerns. Microporous zeolites, owing to their rigid frameworks and porous structural features, have been considered as one of ideal inorganic supports. Metal NPs can be easily encapsulated and stabilized within zeolitic frameworks to prevent unwished aggregation during the catalysis...
2018: Frontiers in Chemistry
https://read.qxmd.com/read/30457707/gated-materials-installing-macrocyclic-arenes-based-supramolecular-nanovalves-on-porous-nanomaterials-for-controlled-cargo-release
#19
REVIEW
Xin-Yue Lou, Yu-Peng Li, Ying-Wei Yang
Supramolecular nanovalves are an emerging class of important elements that are functionalized on the surfaces of inorganic or hybrid nanocarriers in the constructions of smart cargo delivery systems. Taking advantage of the pseudorotaxane structure via host-guest complexation and the dynamic nature of supramolecular interactions, macrocyclic arene-based supramolecular nanovalves have shown great promise in the applications of drug delivery and controlled release. Careful selection of diverse external stimuli, such as pH variations, temperature changes, redox, enzymes, light irradiation and competitive binding, can activate the opening and closing of the nanovalves by altering the supramolecular structure or binding affinities...
November 20, 2018: Biotechnology Journal
https://read.qxmd.com/read/30449084/mesoporous-cages-in-chemically-robust-mofs-created-by-a-large-number-of-vertices-with-reduced-connectivity
#20
Qi Liu, Yinyin Song, Yanhang Ma, Yi Zhou, Hengjiang Cong, Chao Wang, Jorryn Wu, Gaoli Hu, Michael O'Keeffe, Hexiang Deng
We report the design and synthesis of two metal-organic frameworks (MOFs) with permanent porosity, MOF-818 and MOF-919, us-ing a small di-topic organic linker, 1H-pyrazole-4-carboxylic acid (H2PyC), 0.4 nm in length. Three mesoporous cages of unprecedent-ed polyhedra are identified in these MOFs, wuh cage in MOF-818, yys and liu cages in MOF-919, with the diameter of 3.8, 4.9 and 6.0 nm, respectively. The di-topic H2PyC linker functions as the edge in the structure, while two types of metal-containing second building units (SBUs) function as the vertices...
November 19, 2018: Journal of the American Chemical Society
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