Facile modification of NH2-MIL-125(Ti) to enhance water stability for efficient adsorptive removal of crystal violet from aqueous solution

Wen, Gang; Guo, Zhiguang

doi:10.1016/j.colsurfa.2018.01.011

Cited by 68 publications

(20 citation statements)

References 30 publications

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“…70,71 Accordingly, MOFs, one of most attractive adsorbents, exhibited great potential for capturing and removing toluene with low concentrations (<1000 ppm v ). [71][72][73] Fig. 8a shows the toluene sorption isotherms on various hierarchically porous MOFs (H-Cu-BTC_A and H-Cu-BTC) at 298 K. It can be seen that the toluene adsorption isotherm on H-Cu-BTC_A can be divided into three stages.…”

Section: Resultsmentioning

confidence: 99%

Templated fabrication of hierarchically porous metal–organic frameworks and simulation of crystal growth

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Templated fabrication of hierarchically porous metal–organic frameworks and simulation of crystal growth

et al. 2019

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“…We discuss the basics of wetting and critical challenges in the characterization of these hydrophobic materials. The potential applications of hydrophobic MOFs and related composites in hydrocarbon separation, water purification, oil spill cleanup, and catalysis are then elucidated . Finally, we offer perspectives on future directions for this promising field.…”

Section: Introductionmentioning

confidence: 98%

Hydrophobic Metal–Organic Frameworks

et al. 2019

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formed from organic ligands and metal cations. [1][2][3][4][5][6][7][8][9][10] They are typically synthesized under mild conditions via coordinationdirected self-assembly processes and are also known as metal-organic coordination networks and porous coordination polymers. [11][12][13][14] Due to their high surface areas, large porosity, tunable pore sizes, and functionalities, MOFs have prospective applications in fields such as gas storage/separation, sensing or recognition, proton conduction, and magnetism. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] However, the advantageous unique structural features of even some of the best-performing MOFs are readily degraded because of their high moisture sensitivity, which may limit their practical applications. [29][30][31][32] Consequently, there is an ongoing search for highly hydrophobic, porous, sorbent materials to be employed in various large-scale applications in industry such as oil spill cleanup, hydrocarbon storage/separation, or water purification. [33][34][35][36][37] Many academics, industrial scientists, and engineers have therefore conducted research on the fabrication of superhydrophobic surfaces, which involves hydrophobic surface modification and creating surface roughness on the micrometer-or nanoscale. Hydrophobic surfaces are defined as substrates with an apparent contact angle greater than 90° with respect to water. On superhydrophobic materials, water droplets have contact angles above 150° and show very low adhesion because the drops partially rest on an air cushion. The surface energy and roughness govern the wettability of hydrophobic surfaces. In general, lower surface energies and higher roughness are associated with larger contact angles, lower contact angle hysteresis, and robust superhydrophobicity. Because of their ultralow surface energies (10-20 mN m −1 ), alkyl-based or fluorinated compounds are commonly used as hydrophobic modifiers to prepare surfaces with high intrinsic contact angles (>90°). [33][34][35][36][37][38][39][40][41][42] Recently, few methods have been developed for synthesizing hydrophobic MOFs including both pristine and composite systems. This review offers a comprehensive overview of the state of the art in hydrophobic MOF synthesis and the field's challenges and opportunities. Various synthetic strategies for preparing hydrophobic MOFs and their composites are introduced. We discuss the basics of wetting and critical challenges in the characterization of these hydrophobic materials. The potential applications of hydrophobic MOFs and related Metal-organic frameworks (MOFs) have diverse potential applications in catalysis, gas storage, separation, and drug delivery because of their nanoscale periodicity, permanent porosity, channel functionalization, and structural diversity. Despite these promising properties, the inherent structural features of even some of the best-performing MOFs make them moisture-sensitive and unstable in aqueous media, limiting their practical usefulness. This problem could be ...

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“…Therefore, another modification called post-synthetic modification (PSM) [75] is used, which is conducted after the preparation of MOFs. Because the stability of most of MOFs in a water environment is fragile, post-synthetic modifications to water-sensitive MOFs are particularly needed [76]. Wen et al [76] modified MOF crystals using a simple chemical coating with polydimethylsiloxane.…”

Section: Modification Of Mofsmentioning

confidence: 99%

“…Because the stability of most of MOFs in a water environment is fragile, post-synthetic modifications to water-sensitive MOFs are particularly needed [76]. Wen et al [76] modified MOF crystals using a simple chemical coating with polydimethylsiloxane. The MOFs after modification could effectively remove crystalline violet from an aqueous solution and the maximum adsorption capacity was up to 129.87 mg/g.…”

Section: Modification Of Mofsmentioning

confidence: 99%

Technology for the Remediation of Water Pollution: A Review on the Fabrication of Metal Organic Frameworks

2018

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The ineffective control of the release of pollutants into water has led to serious water pollution. Compared with conditions in the past, the polluting components in aquatic environments have become increasingly complex. Some emerging substances have led to a new threat to the safety of water. Therefore, developing cost-effective technologies for the remediation of water pollution is urgently needed. Adsorption has been considered the most effective operational unit in water treatment processes and thus adsorption materials have gained wide attention. Among them, metal organic frameworks (denoted as MOFs) have been rapidly developed in recent years due to their unique physicochemical performance. They are characterized by larger porosity and larger specific surface area, easier pore structure designing, and comfortable structural modification. In many fields such as adsorption, separation, storage, and transportation, MOFs show a better performance than conventional adsorption materials such as active carbon. Their performance is often dependent on their structural distribution. To optimize the use of MOFs, their fabrication should be given more attention, without being limited to conventional preparation methods. Alternative preparation methods are given in this review, such as diffusion, solvent thermal, microwave, and ion thermal synthesis. Furthermore, developing functionalized MOFs is an available option to improve the removal efficiencies of a specific contaminant through pre-synthetic modification and post-synthesis modification. Post-synthesis modification has become a recent research hotspot. The coupling of MOFs with other techniques would be another option to ameliorate the remediation of water pollution. On one hand, their intrinsic drawbacks may be reduced. On the other hand, their performance may be enhanced due to their interaction behaviors. Overall, such coupling technologies are able to enhance the performance of an individual material. Because the excellent performance of MOF materials has been widely recognized and their developments have received wide attention, especially in environmental fields, in the present work we provide a review of fabrication of MOFs so as to motivate readers to deepen their understanding of the use of MOFs.

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Facile modification of NH2-MIL-125(Ti) to enhance water stability for efficient adsorptive removal of crystal violet from aqueous solution

Cited by 68 publications

References 30 publications

Templated fabrication of hierarchically porous metal–organic frameworks and simulation of crystal growth

Templated fabrication of hierarchically porous metal–organic frameworks and simulation of crystal growth

Hydrophobic Metal–Organic Frameworks

Technology for the Remediation of Water Pollution: A Review on the Fabrication of Metal Organic Frameworks

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