Abstract:The adsorption of
heavy metals using metal–organic framework-based
adsorption technology has been pointed out as a promising technique
for the removal of these toxic elements from water. However, their
adsorption capacity needs to be enhanced. Thus, the current work reports
the effect of using a mixed-ligand strategy on the MOF framework and
its effect on the removal of copper ions from water by adding terephthalic
acid (BDC) linker to the ZIF-8precursors (2-methylimidazole (mI) and
Zn
2+
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“…From the trend of the curve, the adsorption amount increased rapidly within the first 2 h of the process, which could be explained by the availability of the pores and the number of active sites at the beginning of the adsorption process. 44 The adsorption rate was relatively slow from 2–5 h, and the adsorption amount began to stabilize and was smooth after 5 h, which may be because much larger resistance must have overcome when DBT diffused to deeper and interior micro pores. Finally, all reached the adsorption equilibrium point at 6 h. Fig.…”
“…From the trend of the curve, the adsorption amount increased rapidly within the first 2 h of the process, which could be explained by the availability of the pores and the number of active sites at the beginning of the adsorption process. 44 The adsorption rate was relatively slow from 2–5 h, and the adsorption amount began to stabilize and was smooth after 5 h, which may be because much larger resistance must have overcome when DBT diffused to deeper and interior micro pores. Finally, all reached the adsorption equilibrium point at 6 h. Fig.…”
“…These mechanical properties change may benefit gas absorption. In 2022, Zineb et al [ 63 ] adopted a mixed‐ligand strategy to increase the adsorption capacity of Cu 2+ . A second ligand terephthalic acid was added into ZIF‐8 to form Zn‐mI‐BDC, which not only kept the crystallinity of ZIF‐8 but also enlarged pore size.…”
Section: Structure and Properties Of Zif‐8mentioning
Zeolite imidazole framework‐8 (ZIF‐8) is the most prestigious one among zeolitic imidazolate framework (ZIF) with tunable dimensions and unique morphological features. Utilizing its synthetic adjustability and structural regularity, ZIF‐8 exhibits enhanced flexibility, allowing for a wide range of functionalities, such as loading of nanoparticle components while preserving biomolecules activity. Extensive efforts are made from investigating synthesis techniques to develop novel applications over decades. In this review, the development and recent progress of various synthesis approaches are briefly summarized. In addition, its interesting properties such as adjustable porosity, excellent thermal, and chemical stabilities are introduced. Further, five representative biomedical applications are highlighted based on above physicochemical properties. Finally, the remaining challenges and offered insights into the future outlook are also discussed. This review aims to understand the co‐relationships between structures and biomedical functionalities, offering the opportunity to construct attractive
materials with promising characteristics.
“…Metal–organic frameworks (MOFs) are a relatively new type of coordination polymers constructed from metal ions or metal clusters linked to organic ligands. , MOFs appear as an emerging class of porous hybrid materials with several advantages and superior properties such as high surface area, tunable porosity, and versatile chemical functionality. − These unique features make them attractive in many applications such as wastewater treatment, , catalysis, electrocatalysts, adsorption, − biomedicine, gas separation, and energy storage . Despite the advancements in this field, most MOFs still suffer from various constraints, notably the elevated manufacturing cost associated with the utilization of commercial organic and inorganic precursors, organic solvents, and high-temperature reactions.…”
Designing easy and sustainable strategies for the synthesis of metal−organic frameworks (MOFs) from organic and inorganic wastes with the efficient removal of phosphate from water remains a challenge. The majority of the reported works have utilized costly precursors and nonsoluble ligands for the synthesis of MOFs. Herein, we have developed a low-cost, simple, and sustainable alternative approach using the coprecipitation method in water at room temperature for the synthesis of a new adsorbentbased trimetallic MOF. Poly(ethylene terephthalate) and stainless steel wastes were used as sources of water-soluble disodium terephthalate ligand and three metallic species (chromium, nickel, and iron salts) for the fabrication of trimetallic MOF (CrNiFe-MOF), respectively. The newly developed MOF demonstrates a superior space-time yield of 5760 g m −3 day −1 , reaching a level allowing the industrialization production of this sustainable MOF. The scanning electron microscopy and adsorption studies revealed that the developed trimetallic MOF consists of aggregated nanoparticles and the presence of defective as well as mesoporous structures. This MOF showed an enhanced adsorption capacity of phosphate from real eutrophic water samples and higher stability in a range of pHs. The density functional theory calculations evidenced that the phosphate ions preferentially adsorb over H 2 O toward the metal oxo-trimers, with the adsorption energies increasing from H 3 PO 4 to PO 4 3− species in line with an improvement of the adsorption performance of CrNiFe-MOF when the pH increases, i.e., when HPO 4 2− and PO 4 3− become more predominant. These calculations also supported that the incorporation of Cr metal sites in the oxo-trimer is expected to boost the phosphate affinity of the MOF. Finally, our work provides an easy and eco-friendly approach for MOF designing to enhance phosphate removal from water.
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