In situ pyrolysis of Ce-MOF to prepare CeO2 catalyst with obviously improved catalytic performance for toluene combustion

Methyl red removal from water by iron based metal-organic frameworks loaded onto iron oxide nanoparticle adsorbent

Despite their advantageous morphological attributes and attractive physicochemical properties, mesoporous silica nanoparticles (MSNs) are merely supported as carriers or vectors for a reason. Incorporating various metal species in the confined nanospaces of MSNs (M-MSNs) significantly enriches their mesoporous architecture and diverse functionalities, bringing exciting potentials to this burgeoning field of research. These incorporated guest species offer enormous benefits to the MSN hosts concerning the reduction of their eventual size and the enhancement of their performance and stability, among other benefits. Substantially, the guest species act through contributing to reduced aggregation, augmented durability, ease of long-term storage, and reduced toxicity, attributes that are of particular interest in diverse fields of biomedicine. In this review, the first aim is to discuss the current advancements and latest breakthroughs in the fabrication of M-MSNs, emphasizing the pros and cons, the confinement of various metal species in the nanospaces of MSNs, and various factors influencing the encapsulation of metal species in MSNs. Further, an emphasis on potential applications of M-MSNs in various fields, including in adsorption, catalysis, photoluminescence, and biomedicine, among others, along with a set of examples is provided. Finally, the advances in M-MSNs with perspectives are summarized.

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Metal Species–Encapsulated Mesoporous Silica Nanoparticles: Current Advancements and Latest Breakthroughs

As organic dyes are a major group of water pollutants, the development of materials for removal of dyes is of great significance for the environment. Here we report a kind of magnetic metal–organic framework (MOF) for the adsorption of different kinds of anionic and cationic dyes. Magnetic NH2-MIL-101(Al) was synthesized and characterized with Fourier-transform infrared spectrometry (FT-IR), physical property measurement system (PPMS), X-ray diffraction (XRD), a transmission electron microscope (TEM), a thermogravimetric analyzer (TGA) and nitrogen adsorption/desorption measurements. Adsorption isotherms and thermodynamic studies indicated that the maximum adsorption capacities of malachite green (MG) and indigo carmine (IC) were 274.4 and 135 mg g−1, respectively. The mechanisms of interaction such as electrostatic interaction, hydrogen bonding, π–π stacking interaction, and hydrophobic interaction are discussed for the adsorption of cationic and anionic dyes onto magnetic NH2-MIL-101(Al). Also, magnetic separation in this method shortened separation time, and the magnetic material can be reused at least five times without obvious decrease in the removal efficiency. Moreover, the synthesis of the magnetic NH2-MIL-101(Al) is easy to control and the good solvent stability makes this material promising as a novel adsorbent for the adsorption and removal of dyes from aqueous solution.

Jan Roggenbuck

Papers

Nanosized iron and chromium oxides supported on mesoporous CeO2 and SBA-15 silica: Physicochemical and catalytic study