A5033980585- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Covalent Organic Framework Applications
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Carbon Dioxide Capture Technologies
- Crystal Structures and Properties
- Carbon dioxide utilization in catalysis
- Polyoxometalates: Synthesis and Applications
- Zeolite Catalysis and Synthesis
- Membrane Separation and Gas Transport
- Catalytic Processes in Materials Science
- Advanced Condensed Matter Physics
- Phase Equilibria and Thermodynamics
- Solid-state spectroscopy and crystallography
- Advanced Photocatalysis Techniques
- Nanomaterials for catalytic reactions
- Extraction and Separation Processes
- Chemical Synthesis and Reactions
- Nanocluster Synthesis and Applications
- Adsorption and biosorption for pollutant removal
- Advanced NMR Techniques and Applications
- Catalysis and Hydrodesulfurization Studies
- Enhanced Oil Recovery Techniques
École Polytechnique Fédérale de Lausanne
2016-2025
HES-SO Valais-Wallis
2019-2025
Institute of Molecular Functional Materials
2025
Swiss Federal Laboratories for Materials Science and Technology
2024
Hôpital de Sion
2018-2020
Institut de Chimie
2015-2018
Lawrence Berkeley National Laboratory
2012-2017
Berkeley College
2015-2017
National Institute of Standards and Technology
2010-2015
NIST Center for Neutron Research
2010-2015
Water adsorption in porous materials is important for many applications such as dehumidification, thermal batteries, and delivery of drinking water remote areas. In this study, we have identified three criteria achieving high performing adsorption. These deal with condensation pressure the pores, uptake capacity, recyclability stability material. search an excellently material, studied compared properties 23 materials, 20 which are metal–organic frameworks (MOFs). Among MOFs 10 zirconium(IV)...
An Iron Separator Petroleum processing initially yields a mixture of saturated and unsaturated hydrocarbons—the feedstocks for fuels, plastics, pharmaceuticals, wide range other commercial products. At present, distillation is the primary means separating components this mixture. A sorbent or membrane-based approach to separation could reap substantial energy savings. Bloch et al. (p. 1606 ) found that an iron-based metal organic framework material shows promise very efficient sorption-based...
The air-free reaction between FeCl(2) and H(4)dobdc (dobdc(4-) = 2,5-dioxido-1,4-benzenedicarboxylate) in a mixture of N,N-dimethylformamide (DMF) methanol affords Fe(2)(dobdc)·4DMF, metal-organic framework adopting the MOF-74 (or CPO-27) structure type. desolvated form this material displays Brunauer-Emmett-Teller (BET) surface area 1360 m(2)/g features hexagonal array one-dimensional channels lined with coordinatively unsaturated Fe(II) centers. Gas adsorption isotherms at 298 K indicate...
A significant reduction in the energy costs associated with cryogenic separation of ethylene–ethane and propylene–propane mixtures could potentially be realized through use selective solid adsorbents that operate at higher temperatures. The metal–organic frameworks M2(dobdc) (M = Mg, Mn, Fe, Co, Ni, Zn; dobdc4− 2,5-dioxido-1,4-benzenedicarboxylate) are particular interest for this application, owing to their high density coordinatively unsaturated M2+ cation sites can selectively interact...
Low-pressure adsorption of carbon dioxide and nitrogen was studied in both acidic copper-exchanged forms SSZ-13, a zeolite containing an 8-ring window. Under ideal conditions for industrial separations CO(2) from N(2), the adsorbed solution theory selectivity is >70 each compound. For low gas coverage, isosteric heat found to be 33.1 34.0 kJ/mol Cu- H-SSZ-13, respectively. From situ neutron powder diffraction measurements, we ascribe over N(2) differences binding sites two gases, where...
Analysis of the CO2 adsorption properties a well-known series metal–organic frameworks M2(dobdc) (dobdc4− = 2,5-dioxido-1,4-benzenedicarboxylate; M Mg, Mn, Fe, Co, Ni, Cu, and Zn) is carried out in tandem with situ structural studies to identify host–guest interactions that lead significant differences isosteric heats adsorption. Neutron X-ray powder diffraction single crystal experiments are used unveil site-specific binding within many these materials while systematically varying both...
Drinking water contamination with heavy metals, particularly lead, is a persistent problem worldwide grave public health consequences. Existing purification methods often cannot address this quickly and economically. Here we report cheap, stable metal-organic framework/polymer composite, Fe-BTC/PDA, that exhibits rapid, selective removal of large quantities such as Pb2+ Hg2+, from real world samples. In work, Fe-BTC treated dopamine, which undergoes spontaneous polymerization to polydopamine...
A series of zeolite adsorbents has been evaluated for potential application in post-combustion CO2 capture using a new high-throughput gas adsorption instrument capable measuring 28 samples parallel. Among the zeolites tested, Ca-A exhibits highest uptake (3.72 mmol g−1 and 5.63 cm−3) together with an excellent selectivity over N2 under conditions relevant to from dry flue stream coal-fired power plant. The large initial isosteric heat −58 kJ mol−1 indicates presence strong interactions...
Using high-throughput instrumentation to screen conditions, the reaction between FeCl2 and H3BTT·2HCl (BTT3− = 1,3,5-benzenetristetrazolate) in a mixture of DMF DMSO was found afford Fe3[(Fe4Cl)3(BTT)8]2·22DMF·32DMSO·11H2O. This compound adopts porous three-dimensional framework structure consisting square [Fe4Cl]7+ units linked via triangular BTT3− bridging ligands give an anionic 3,8-net. Mössbauer spectroscopy carried out on DMF-solvated version material indicated contain high-spin Fe2+...
With the ever-increasing production of electronics, there is an ensuing need for gold extraction from sources other than virgin mines. Currently, are no technologies reported to date that can effectively and selectively concentrate ultratrace amounts liquid sources. Here, we provide a blueprint design several highly porous composites made up metal–organic framework (MOF) template redox active, polymeric building blocks. One such composite, Fe-BTC/PpPDA, shown rapidly extract trace complex...
Six metal-organic frameworks of the M2(dobdc) (M = Mg, Mn, Fe, Co, Ni, Zn; dobdc(4-) 2,5-dioxido-1,4-benzenedicarboxylate) structure type are demonstrated to bind carbon monoxide reversibly and at high capacity. Infrared spectra indicate that, upon coordination CO divalent metal cations lining pores within these frameworks, C-O stretching frequency is blue-shifted, consistent with nonclassical metal-CO interactions. Structure determinations reveal M-CO distances ranging from 2.09(2) Å for M...
Hybrid polymer/inorganic membranes with dual transport pathways exhibit exceptional separation performance for carbon capture and non-classical gas behavior upon formation of a percolative network.
The hydrogen storage properties of a new family isostructural metal–organic frameworks are reported. M2(dobpdc) (M = Mg, Mn, Fe, Co, Ni, Zn; dobpdc4– 4,4′-dioxidobiphenyl-3,3′-dicarboxylate) analogous to the widely studied M2(dobdc) Cu, dobdc4– 2,5-dioxido-1,4-benzenedicarboxylate) materials, featuring same weak-field oxo-based ligand environment for M2+ metal centers, but with larger pore volume resulting from extended length linker. Hydrogen gas adsorption isotherms measured at 77 and 87 K...
Metal-organic frameworks (MOFs) offer great promise in a variety of gas- and liquid-phase separations. However, the excellent performance on lab scale hardly translates into pilot- or industrial-scale applications due to microcrystalline nature MOFs. Therefore, structuring MOFs pellets beads is highly solicited timely requirement. In this work, general method developed for preparing MOF-polymer composite based an easy polymerization strategy. This adopts biocompatible, biodegradable...
In this contribution, recent advances in the construction of MOF-polymer composites and their corresponding applications are briefly reviewed. The appearance such architectures is becoming prominent literature, due to fact that union these two dissimilar components can give rise a number desirable properties not necessarily achieved by individual components. For instance, while MOFs already boast unprecedented internal surface areas highly tunable pore structures, they often suffer from...
Metal-organic frameworks are of interest in a number host-guest applications. However, their weak coordination bonding often leads to instability aqueous environments, particularly at extreme pH, and hence, is challenging topic the field. In this work, two-step, post-synthetic polymerization method used create series highly hydrophobic, stable MOF composites. The MOFs first coated with thin layers polydopamine from free-base dopamine under mild oxygen atmosphere, which then undergoes Michael...
With the fast-growing accumulation of electronic waste and rising demand for rare metals, it is compelling to develop technologies that can promotionally recover targeted like gold, from waste, a process referred as urban mining. Thus, there increasing interest in design materials achieve rapid, selective gold capture while maintaining high adsorption capacity, especially complex aqueous-based matrices. Here, highly porous metal-organic framework (MOF)–polymer composite, BUT-33–poly( para...
Detailed neutron powder diffraction (NPD) experiments were carried out on the parent and CO2 adsorbed Mg-MOF-74 (MOF: metal–organic framework). Data collected at low temperature revealed two adsorption sites pore surface multiple changes in framework as a function of loading. Upon heating samples to room temperature, data minimal expansivity upon up 0.94 CO2/Mg (≈ 25% mass fraction). Further, temperature-dependent bare reveals net zero thermal expansion between 10 475 K.
Abstract A chromium(II)‐based metal–organic framework Cr 3 [(Cr 4 Cl) (BTT) 8 ] 2 (Cr‐BTT; BTT 3− =1,3,5‐benzenetristetrazolate), featuring coordinatively unsaturated, redox‐active 2+ cation sites, was synthesized and investigated for potential applications in H storage O production. Low‐pressure adsorption neutron powder diffraction experiments reveal moderately strong Cr–H interactions, line with results from previously reported M‐BTT frameworks. Notably, gas measurements also excellent /N...
Metal–organic frameworks (MOFs) are versatile nanoporous materials that have gained significant interest as low heat capacity, high selectivity sorbents for CO2 capture applications. Large-scale atomistic simulations identifying high-performance MOFs possible, but limited to systems which existing molecular mechanics force fields describe the interactions between guest and framework atoms with sufficient accuracy. However, standard not applicable cases involving coordinatively unsaturated...
An iron(II)-based metal-organic framework featuring coordinatively unsaturated redox-active metal cation sites, Fe2(dobdc) (dobdc(4-) = 2,5-dioxido-1,4-benzenedicarboxylate), is shown to strongly bind nitric oxide at 298 K. Adsorption isotherms indicate an adsorption capacity greater than 16 wt %, corresponding the of one NO molecule per iron center. Infrared, UV-vis, and Mössbauer spectroscopies, together with magnetic susceptibility data, confirm strong binding a result electron transfer...
High internal surface areas, an asset that is highly sought after in material design, has brought metal–organic frameworks (MOFs) to the forefront of materials research. In fact, a major focus field on creating innovative ways maximize MOF areas. Despite this, large-pore MOFs, particularly those with mesopores, continue face problems pore collapse upon activation. Herein, we demonstrate easy method inhibit this problem via introduction small quantities polymer. For several mesoporous,...
Herein, a novel integrated adsorption–photoreduction system, which captures highly mobile and toxic hexavalent chromium (Cr(<sc>vi</sc>)) from real-world water samples reduces it to less benign Cr(<sc>iii</sc>) species, was designed.