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Application of Metal-Organic Frameworks (MOFs) for Hydrogen Storage
Published in Hieng Kiat Jun, Nanomaterials in Energy Devices, 2017
Mohammad Jafarzadehp, Amir Reza Abbasi
Zeolitic imidazolate frameworks (ZIFs) are a class of porous and crystalline materials that have the advantages of inorganic zeolites (high stability) and MOFs (high porosity and organic functionality) (Hayashi et al. 2007). In ZIFs, extended three-dimensional structures are constructed from tetrahedral metal ion (e.g., Zn, Co) nodes connected through ditopic imidazolate (C3N2H3− = Im) or functionalized Im bridges (Phan et al. 2010, Nguyen et al. 2014). The resulting structure exhibits topologies resembling microporous zeolites, as the M-Im-M angle is similar to the Si-O-Si angle (145º) in zeolites. A large variety of ZIFs with different topologies (structure symbols: sod, cag, mer, crb, dft, gis, rho, gme and lta) (Wang et al. 2008) can be made (refer Fig. 2) by using metal salts with imidazole (ImH) using, for example, mechanochemistry (Beldon et al. 2010) and solvent-assisted linker exchange (Karagiaridi et al. 2012) methods. ZIFs exhibit permanent porosity, and high thermal and chemical stability (Park et al. 2006), therefore having potential applications in catalysis (Stephenson et al. 2015), gas separation, and the storage (Thornton et al. 2012) of CO2 (Banerjee et al. 2009) and CH4 (Houndonougbo et al. 2013). By precise control of the pore size and structural functionality, gas storage could be improved (Banerjee et al. 2009).
Carbon Nanomaterials for Electrochemical Energy Conversion
Published in Kun Zhou, Carbon Nanomaterials, 2020
Wang Zhang, Rui Li, Meixin Zhou, Kun Zhou
Zeolitic imidazolate frameworks (ZIFs) is a type of metal-organic framework (MOF) possessing abundant carbon, nitrogen, and transition metals. It can be used as raw materials to form NCNTs via direct solid pyrolysis. Su et al. produced a set of NCNTs with different N content using Zn-Fe-ZIF as a precursor and dicyandiamide as an extra N supplier [68]. In the pyrolysis of Zn-Fe-ZIF at relatively low temperature, the generated Fe and Fe3C can be catalyzed to form NCNTs, and the dicyandiamide induced the formation of NCNTs with graphitic structure. The results showed that the Fe species and high amounts of graphitic N in NCNTs played important roles in the improvement of the ORR catalytic performance.
Response surface methodology, and artificial neural network model for removal of textile dye Reactive Yellow 105 from wastewater using Zeolitic Imidazolate-67 modified by Fe3O4 nanoparticles
Published in International Journal of Phytoremediation, 2023
Elham Pournamdari, Leila Niknam, Shahnaz Davoudi, Fereydoon Khazali
Conventional adsorbents have presented a significant challenge in terms of selectivity and capacity. In recent years, metal-organic frameworks (MOFs), have emerged as promising alternative in various applications, including adsorption processes (Nazir et al.2021; Rachid et al.2022). Zeolitic Imidazolate Frameworks (ZIFs) represent a particular class of Metal-Organic Frameworks (MOFs), formed by imidazole linkers and zinc or cobalt ions, resulting in microporous crystalline structures with characteristics of both MOFs and zeolites (Si et al.2020; El-Desouky and El-Bindary 2021; Wan et al.2022). ZIFs possess distinct porous structures with open frameworks, adjustable cage pore structures, large surface areas, exceptional functionalities, and improved thermal and chemical stabilities. These unique properties make them suitable for a wide range of potential applications, including adsorption, catalysis, separation, and sensing (Hu et al.2018; Hajializadeh et al.2022).
Effect of altering linker ratio on nano-ZIF-8 polymorphisms in water-based and modulator-free synthesis
Published in Journal of Coordination Chemistry, 2022
Noor Fazrieyana Hamidon, Mohamed Ibrahim Mohamed Tahir, Muhammad Alif Mohamad Latif, Mohd Basyaruddin Abdul Rahman
Zeolitic imidazolate frameworks (ZIFs) are a sub-class of metal-organic frameworks (MOFs). ZIFs, which are made up of metal ions and imidazolate linkers, have received considerable attention due to their versatility with cage-like and tunable properties [1,2]. Their structures can be tailored to specific shapes and sizes [3]. Zeolitic imidazolate framework-8 (ZIF-8) with sodalite topology, constructed from 2-methylimidazole (HMeIM) and zinc salt, is one of the most investigated ZIF materials [4–6]. Many synthesis methods for producing nano-sized crystals of MOFs (nMOFs) have been established. nMOFs usually have a diameter ranging from 5-500 nm and are valued for their uniform size and high monodispersity, which results in a framework with a consistent and easily controlled surface area [7,8]. The particle sizes range from nanometer [9–11] to micrometer [12], and the BET surface areas range from 600 [13] to 1600 m2g−1 [14–18].
ZIF-based zinc titanate composite as sufficient sorbent for removal of Congo red from aqueous solutions
Published in Journal of Asian Ceramic Societies, 2020
Taybeh Farahmand, Saeedeh Hashemian, Ali Sheibani
Metal–organic frameworks (MOFs) are novel hybrid inorganic–organic materials containing metal ions or clusters interconnected by a variety of organics. These novel hybrid inorganic-organic solid-state compounds are formed by the linking of single metal ions or multinuclear metal ion building units with appropriate oligotrophic organic ligands. MOFs have recently attracted great interest not only because of their useful interesting buildings and topologies but also due to their potential applications as efficient materials. MOFs have important large-scale industrial applications such as gas storage, gas separation and catalysis [31–34]. Zeolitic imidazolate frameworks (ZIFs) are a subfamily of MOFs and have thermal and chemical stability. Recently they are using as wastewater treatment [35] and as membranes [36]. But, up to now, there have few studies on MOF composites for wastewater treatment and separation.