Synthesis and performance evaluation of copper and magnesium-based metal organic framework supported ionic liquid membrane for CO2/N2 separation

Multifunctional Hydrogel Integrated Hemangioma Stem Cell-Derived Nanovesicle-Loaded Metal-Polyphenol Network Promotes Diabetic Flap Survival

Diabetes-associated skin defects represent a significant global health challenge. While flap grafts have been a preferred treatment for soft-tissue injuries in diabetic patients, their survival is often compromised by impaired vascularization, infection, and the adverse diabetic pathological microenvironment. To address these limitations, a hybrid photo-crosslinkable hydrogel (HPC) integrated hemangioma stem cell-derived nanovesicle (HemV)-loaded dual-metal-polyphenol network (dMPN) (HemV@dMPN/HPC) is developed. HemVs, derived from highly vascularized infantile hemangioma tissues, play a key role in promoting cell proliferation and angiogenesis. The dMPN facilitates the gradual release of copper (Cu2+) and magnesium ions (Mg2+), stimulating angiogenesis and mitigating inflammation. The HPC further sustains ion release while preserving the therapeutic efficacy of HemVs. Moreover, both HPC and Cu2+ act to confer antibacterial properties, further accelerating wound healing. This multifunctional HemV@dMPN/HPC platform offers a promising therapeutic strategy for treating large diabetic skin defects and can potentially improve flap graft survival.

Recent Advances of Carbon Capture in Metal-Organic Frameworks: A Comprehensive Review

The excessive emission of greenhouse gases, which leads to global warming and alarms the world, has triggered a global campaign for carbon neutrality. Carbon capture and sequestration (CCS) technology has aroused wide research interest as a versatile emission mitigation technology. Metal-organic frameworks (MOFs), as a new class of high-performance adsorbents, hold great potential for CO2 capture from large point sources and ambient air due to their ultra-high specific surface area as well as pore structure. In recent years, MOFs have made great progress in the field of CO2 capture and separation, and have published a number of important results, which have greatly promoted the development of MOF materials for practical carbon capture applications. This review summarizes the most recent advanced research on MOF materials for carbon capture in various application scenarios over the past six years. The strategies for enhancing CO2 selective adsorption and separation of MOFs are described in detail, along with the development of MOF-based composites. Moreover, this review also systematically summarizes the highly concerned issues of MOF materials in practical applications of carbon capture. Finally, future research on CO2 capture by MOF materials is prospected.

Novel chitosan-zeolite X composite beads prepared by phase-inversion method for CO2 adsorptive capture

The urgent need to mitigate carbon emissions from industrial heat production has led to the exploration of novel carbon-based materials for carbon capture. Chitosan, a versatile framework, has been widely utilized for embedding many materials such as grafted graphene oxide, zeolite, and activated carbon to enhance the carbon capture capacity of diverse carbon-based materials. Remarkably, the combination of chitosan and zeolite overcomes the inherent drawbacks of powdery zeolite, resulting in improved stability and efficiency in carbon capture applications. In this study, zeolite X-chitosan composite was successfully synthesized using phase inversion method followed by solvent exchange and air drying. The synthesis procedure described in this study presents a notable advantage in terms of simplicity and ease of fabrication. The combination of SEM and XRD analyses provided evidence that the composite exhibited a uniform arrangement of zeolite within the chitosan framework and maintained the original properties of the powdered zeolite. The adsorption capacity of the composite was first investigated by varying mass ratio of zeolite per chitosan. The composite with mass ratio that gave the best adsorption capacity were then tested under various temperatures (-20 °C, 0 °C, 30 °C, and 50 °C) and pressures (1 kPa, 3 kPa, 5 kPa, and 30 kPa). The application of different adsorption models was also employed to simulate the breakthrough curves. Furthermore, the material also underwent multiple continuous adsorption-desorption cycles showing its potential for repeated rechargeability. In contrast, the synthesis and characterization of copper ion-exchanged composite yielded significant drop in adsorption capacity, likely due to the formation of ligands or the inherent reactivity of Cu2+ ions towards hydroxide.

Progress in advanced electrospun membranes for CO2 capture: Feedstock, design, and trend

The emission of large amounts of carbon dioxide has caused serious environmental problems and hindered the construction of a green and low-carbon society. Efficient carbon dioxide capture has become an important means to slow down global climate warming and achieve effective utilization of carbon dioxide. Membranes synthesized by electrospinning technology are becoming promising carbon capture materials due to their unique characteristics. This review describes the features of membranes prepared from available raw materials and presents their application performances in carbon capture. The preparation methods of various types of membrane materials with excellent capture performance are summarized, and the effects of electrospinning parameters on electrospun fibers are systematically analyzed. Furthermore, recommendations and expectations for further development of electrospun membranes for carbon capture applications are given. These works provide important references for an in-depth understanding of the development status of electrospun membranes in the field of carbon capture and for expanding future research.

Heteroepitaxial growth of ZIF-67 nanoparticles on the ZIF-L(Zn) nanosheets for fabrication of Pebax mixed matrix membranes with highly efficient CO2 separation

ZIF-67 nanoparticles were grown on ZIF-L(Zn) nanosheets by in-situ heteroepitaxial method, resulting in ZIF-67@ZIF-L(Zn) as a charming two-dimensional (2D) nanocomposite for incorporation into the Pebax-1657 and improving its CO2/N2 separation performance. The fabricated nanofillers and membranes were analyzed by characterization tests (FTIR, XRD, FESEM, and EDAX-mapping) and gas separation experiments (effect of filler loading, filler type, feed pressure, and long-term stability). It was observed that the nanosheets were well dispersed in the matrix, and they had formed a proper interaction by creating hydrogen bonds at the interface; in addition, due to their crystalline nature, they increased the crystallinity of the MMMs. The results of the gas permeability test showed that these nanofillers, with their composite structure, had a synergistic effect on the gas solubility and screening and caused a significant improvement in the separation performance of MMMs. So that the best performance achieved with a CO2 permeability of 72.9 Barrer and a CO2/N2 selectivity of 102.9 at 10 bar for the MMM containing 2 wt% of ZIF-L(Zn)@ZIF-67, also exceeding Robeson's upper bound. Moreover, Mindex as a criterion for evaluation of the gas separation performance of MMMs in simultaneous improvement of the permeability and selectivity was proposed in this work. The Mindex values in the range of 0.5-1.5 were calculated for the MMM containing 2 wt% of ZIF-L(Zn)@ZIF-67 nanosheet which indicating a good quality for the gas separation performance. Furthermore, at equal filler loading (2 wt%), this membrane outperformed all MMMs containing other nanofillers (ZIF-67, ZIF-8, ZIF-L(Co), or ZIF-L(Zn)).

Ionic Liquids Functionalized MOFs for Adsorption

Metal-organic frameworks (MOFs) and ionic liquids (ILs) represent promising materials for adsorption separation. ILs incorporated into MOF materials (denoted as IL/MOF composites) have been developed, and IL/MOF composites combine the advantages of MOFs and ILs to achieve enhanced performance in the adsorption-based separation of fluid mixtures. The designed different ILs are introduced into the various MOFs to tailor their functional properties, which affect the optimal adsorptive separation performance. In this Perspective, the rational fabrication of IL/MOF composites is presented, and their functional properties are demonstrated. This paper provides a critical overview of an emergent class of materials termed IL/MOF composites as well as the recent advances in the applications of IL/MOF composites as adsorbents or membranes in fluid separation. Furthermore, the applications of IL/MOF in adsorptive gas separations (CO2 capture from flue gas, natural gas purification, separation of acetylene and ethylene, indoor pollutants removal) and liquid separations (separation of bioactive components, organic-contaminant removal, adsorptive desulfurization, radionuclide removal) are discussed. Finally, the existing challenges of IL/MOF are highlighted, and an appropriate design strategy direction for the effective exploration of new IL/MOF adsorptive materials is proposed.

Recent progress in high-performance environmental impacts of the removal of radionuclides from wastewater based on metal-organic frameworks: a review

The nuclear industry is rapidly developing and the effective management of nuclear waste and monitoring the nuclear fuel cycle are crucial. The presence of various radionuclides such as uranium (U), europium (Eu), technetium (Tc), iodine (I), thorium (Th), cesium (Cs), and strontium (Sr) in the environment is a major concern, and the development of materials with high adsorption capacity and selectivity is essential for their effective removal. Metal-organic frameworks (MOFs) have recently emerged as promising materials for removing radioactive elements from water resources due to their unique properties such as tunable pore size, high surface area, and chemical structure. This review provides an extensive analysis of the potential of MOFs as adsorbents for purifying various radionuclides rather than using different techniques such as precipitation, filtration, ion exchange, electrolysis, solvent extraction, and flotation. This review discusses various MOF fabrication methods, focusing on minimizing environmental impacts when using organic solvents and solvent-free methods, and covers the mechanism of MOF adsorption towards radionuclides, including macroscopic and microscopic views. It also examines the effectiveness of MOFs in removing radionuclides from wastewater, their behavior on exposure to high radiation, and their renewability and reusability. We conclude by emphasizing the need for further research to optimize the performance of MOFs and expand their use in real-world applications. Overall, this review provides valuable insights into the potential of MOFs as efficient and durable materials for removing radioactive elements from water resources, addressing a critical issue in the nuclear industry.