Titanium Metal Organic Framework Research Articles

Metal–Organic Framework-Templated Synthesis of Bifunctional N-Doped TiO2–Carbon Nanotablets via Solid-State Thermolysis

Porous nitrogen-doped TiO2–carbon hybrid nanotablets were prepared via one-step solid-state thermolysis of amino-functionalized titanium metal–organic framework NH2-MIL-125(Ti). Amorphous, anatase, rutile, or mixture phases of TiO2 were obtained controllably by manipulating pyrolysis temperature. The anionic N- in NH2-MIL-125(Ti)’s 3D structure formed as pyridinic nitrogen and pyrrolic nitrogen into the graphene layer. Meanwhile, a programmed evolution of the porous structure of the resultant composites, i.e., microporous, hierarchically micro/mesoporous, and mesoporous, was presented systematically. The morphology and specific nanoporous structure of the products are conferred by the metal–organic framework template. The resultant composites with hierarcical meso/miciroporous structures showed highly improved CO2 uptake ability compared with those of commercial P25 TiO2, g-C3N4, and 3D graphene. TiO2 nanoparticles are well dispersed in the porous nitrogen-doped carbon matrix, endowing the obtained compos...

Carbon-coated rutile titanium dioxide derived from titanium-metal organic framework with enhanced sodium storage behavior

Abstract Carbon-coated rutile titanium dioxide (CRT) was fabricated through an in-situ pyrolysis of titanium-based metal organic framework (Ti8O8(OH)4[O2CC6H4CO2]6) crystals. Benefiting from the Ti O C skeleton structure of titanium-based metal organic framework, the CRT possesses abundant channels and micro/mesopores with the diameters ranging from 1.06 to 4.14 nm, shows larger specific surface area (245 m2 g−1) and better electronic conductivity compared with pure titanium dioxide (12.8 m2 g−1). When applied as anode material for sodium-ion batteries, the CRT electrode exhibits a high cycling performance with a reversible capacity of ∼175 mAh g−1 at 0.5 C-rate after 200 cycles, and obtains an excellent rate capability of ∼70 mAh g−1 after 2000 cycles even at a specific current of 3360 mA g−1(20 C-rate). The outstanding rate capability can be attributed to the carbon-coated structure, which may effectively prevent aggregation of the titanium dioxide nanoparticles, accelerate the mass transfer of Na+ and speed up the charge transfer rate. Considering these advantages of this particular framework structure, the CRT can serve as an alternative anode material for the industrial application of SIBs.

Hierarchical Porous Anatase TiO2 Derived from a Titanium Metal-Organic Framework As Superior Anode Materials for Lithium Ion Batteries

Hierarchical meso-/macroporous anatase TiO2 (HPT) was synthesized from the hydrolysis of a titanium metal-organic framework precursor followed by calcination in air. The HPT possesses bimodal and hierarchical porosity: mesopores with pore diameters of 12, 16 and 28 nm along with macropores with pore diameters of up to 185 nm.This unique porous feature enables the superior rate capability and excellent cycling stability of anatase TiO2 as an anode for rechargeable lithium-ion batteries(LIBs). At a rate of 5 C, the specific discharge capacity of the HPT electrode is about 155 mA h g-1. After 200 cycles at 5 C charging/discharging rates, the capacity loss was only ~6.5 %. The superior rate capability and excellent cycling stability make HPT a promising anode material for fast rechargeable LIBs. Figure 1

MOF-derived mesoporous anatase TiO2 as anode material for lithium–ion batteries with high rate capability and long cycle stability

Mesoporous anatase TiO2 (MAT) with a disk-like morphology was prepared by direct pyrolysis of a titanium metal-organic framework [MIL-125(Ti)] in air. When employed as an anode material for lithium–ion batteries, the as-prepared MAT electrode exhibited superior lithium storage properties with negligible capacity loss at high discharge/charge rates. At 10C rate, the prepared electrode still delivered a high reversible capacity of 127 mA h g−1 after 1100 cycles. The superior battery performance could be attributed to the unique mesoporous structure that promoted Li+ diffusion and shortened the Li+ and e− transport length.

Porous anatase TiO2 derived from a titanium metal–organic framework as a multifunctional phospho-oriented nanoreactor integrating accelerated digestion of proteins and in situ enrichment

Hierarchical porous anatase TiO2 derived from a titanium MOF was synthesized and used as a multifunctional phospho-oriented nanoreactor.

A versatile synthetic route for the preparation of titanium metal-organic frameworks.

Exploitation of new titanium metal-organic frameworks (Ti-MOFs) with high crystallinity has been attracting great attention due to their vast application potential in photocatalysis. Herein a versatile synthetic strategy, namely, High Valence Metathesis and Oxidation (HVMO), is developed to synthesize a series of Ti-MOFs with predesigned topologies and structures. The crystallinity of these Ti-MOFs was well maintained throughout, as confirmed by powder X-ray diffraction and gas adsorption measurements. Significantly, there were only a few examples of Ti-MOFs, not to mention a general synthetic strategy for various kinds of Ti-MOFs in the literature. This contribution also illustrates the intriguing potential of Ti-MOF platforms in photocatalysis.

Photosensitive titanium and zirconium Metal Organic Frameworks: Current research and future possibilities

The sustainable production and storage of energy is one of the most important scientific and technological challenges to ensure the energy availability for the near future. For that matter, light-driven photochemical reactions, such as water splitting and CO2 reduction with water, can transform sunlight energy into chemical energy. Designing an efficient porous organic/inorganic hybrid material (known as Metal-Organic Frameworks (MOFs)) that features molecular functional components for light harvesting and catalysis can address the challenges of the field and create a technological breakthrough to convert sunlight into solar fuels. The latest achievements in MOFs for artificial photosynthesis and photocatalysis are presented with emphasis on bulk MOFs and thin film MOFs deposition. This review is focused on robust Zr and Ti MOFs for water splitting reactions and CO2 reduction, which are the most promising materials for this purpose. New directions are evaluated and the challenges for photocatalytic MOF are also discussed.

A clean and general strategy to decorate a titanium metal-organic framework with noble-metal nanoparticles for versatile photocatalytic applications.

We demonstrate a facile and general approach for the fabrication of highly dispersed Au, Pd, and Pt nanoparticles (NPs) on MIL-125(Ti) without using extra reducing and capping agents. Noble-metal NP formation is directed by an in situ redox reaction between the reductive MIL-125(Ti) with Ti(3+) and oxidative metal salt precursors. The resulting composites function as efficient photocatalysts.

Hierarchical porous anatase TiO2 derived from a titanium metal-organic framework as a superior anode material for lithium ion batteries.

Hierarchical meso-/macroporous anatase TiO2 was synthesized by the hydrolysis of a titanium metal-organic framework precursor followed by calcination in air. This unique porous feature enables the superior rate capability and excellent cycling stability of anatase TiO2 as an anode for rechargeable lithium-ion batteries.

Photodeposition of metal sulfides on titanium metal–organic frameworks for excellent visible-light-driven photocatalytic Cr(vi) reduction

A series of metal sulfides has been used to sensitize titanium metal–organic frameworks to form heterostructures through a facile photodeposition strategy.

Facile synthesis of amino-functionalized titanium metal-organic frameworks and their superior visible-light photocatalytic activity for Cr(VI) reduction

Porous metal-organic frameworks (MOFs) have been arousing a great interest in exploring the application of MOFs as photocatalyst in environment remediation. In this work, two different MOFs, Ti-benzenedicarboxylate (MIL-125(Ti)) and amino-functionalized Ti-benzenedicarboxylate (NH2-MIL-125(Ti)) were successfully synthesized via a facile solvothermal method. The MIL-125(Ti) and NH2-MIL-125(Ti) were well characterized by XRD, SEM, XPS, N2 adsorption–desorption measurements, thermogravimetric analysis and UV–vis diffuse reflectance spectra (DRS). It is revealed that the NH2-MIL-125(Ti) has well crystalline lattice, large surface area and mesoporous structure, chemical and thermal stability, and enhanced visible-light absorption up to 520nm, which was associated with the chromophore (amino group) in the organic linker. Compared with MIL-125(Ti), NH2-MIL-125(Ti) exhibited more efficient photocatalytic activity for Cr(VI) reduction from aqueous solution under visible-light irradiation. The addition of hole scavenger, the hole scavenger concentration and the pH value of the reaction solution played important roles in the photo-catalytic reduction of Cr(VI). The presence of Ti3+–Ti4+ intervalence electron transfer was the main reason for photo-excited electrons transportation from titanium-oxo clusters to Cr(VI), facilitating the Cr(VI) reduction under the acid condition. It was demonstrated that amino-functionalized Ti(IV)-based MOFs could be promising visible-light photocatalysts for the treatment of Cr(VI)-contained wastewater.

Enhanced water stability and CO2 gas sorption properties of a methyl functionalized titanium metal–organic framework

A methyl-modified metal–organic framework (m-TiBDC) exhibiting significantly enhanced hydrostability than unmodified TiBDC maintains its framework structure and also CO2 gas adsorption capacity even after its immersion in water for 2 hours.

A novel humidity sensor based on NH2-MIL-125(Ti) metal organic framework with high responsiveness

A novel porous nanosized humidity-sensing material of amine-functionalized titanium metal organic framework (MOF), NH2-MIL-125(Ti), was investigated. NH2-MIL-125(Ti) nanoparticles with high phase purity and good physicochemical property were synthesized by a simple hydrothermal method. The nanosized MOF was characterized by X-ray diffraction and scanning electron microscope. The average size of the MOF nanoparticles is around 300 nm. Then NH2-MIL-125(Ti) humidity sensor was fabricated by coating the nanosized materials on interdigitated electrodes. The humidity sensor based on NH2-MIL-125(Ti) shows good linearity of RH (11–95 % RH), as well as fast response and recovery time. The RH detecting range is from 11 to 95 % RH at 100 Hz. The response and recovery time are about 45 and 50 s, respectively. Moreover, the sensing mechanism was discussed by complex impedance analysis in detail. These results indicate the potential application of NH2-MIL-125(Ti) in humidity sensors.

An Amine‐Functionalized Titanium Metal–Organic Framework Photocatalyst with Visible‐Light‐Induced Activity for CO2 Reduction

Let your light shine: the photocatalytic reduction of carbon dioxide to the formate anion under visible light irradiation is for the first time realized over a photoactive Ti-containing metal-organic framework, NH(2)-MIL-125(Ti), which is fabricated by a facile substitution of ligands in the UV-responsive MIL-125(Ti) material.

An Amine‐Functionalized Titanium Metal–Organic Framework Photocatalyst with Visible‐Light‐Induced Activity for CO2 Reduction

Aus UV wird sichtbar: Die photokatalytische Reduktion von CO2 zu Formiat wurde erstmals mit sichtbarem Licht erreicht. Als Photokatalysator diente eine photoaktive titanhaltige Metall-organische Gerüstverbindung, die durch eine einfache Ligandensubstitution in dem auf UV-Licht reagierenden MIL-125(Ti)-Material erhalten wurde (siehe Schema; TEOA=Triethanolamin).

Shape Controlled Synthesis of Nano-Sized Titanium(IV) Metal-Organic Frameworks

A convenient method to synthesize shape controlled nano-sized metal-organic frameworks (MOFs) has been explored to prepare some novel mixed–ligand complexes of titanium(IV) with the general formula [Ti(acac)Cl2−n(OOCC15H31)(SB)n] (where Hacac = acetylacetone, HSB = Schiff bases and n = 1 or 2). They have been synthesized by stepwise substitutions of chloride ions from titanium(IV) chloride. The complexes were characterized by elemental analyses, molecular weight determinations, spectral, and TEM studies. Coordination number 7 and 8 was assigned for titanium(IV) in the complexes. The powder XRD, TEM, and SAED studies indicates that these complexes are nano-sized having poor crystalline nature.