Facile synthesis of melamine-based porous polymer networks and their application for removal of aqueous mercury ions

Yang, Guangwen; Han, Heyou; Du, Chunyan; Luo, Zhihui; Wang, Yanjun

doi:10.1016/j.polymer.2010.10.052

Cited by 161 publications

(137 citation statements)

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“…−1 , which is signifi cantly lower than the reported values of the melamine-terephthaldehyde based network compounds without metal incorporation [ 16 ] as well as than the surface areas of MOFs [ 3 ] and activated carbons. [ 5 ] Nevertheless, the surface area is comparable to the values of the reported Kubas type metal hydrazide gel materials.…”

Section: Doi: 101002/admi201400107mentioning

confidence: 60%

“…In addition, the synthesis of Fe[N(SiMe 3 ) 2 ] 2 was done by reacting FeCl 2 with 2 molar equivalent of LiN(SiMe 3 ) 2 at room temperature in an anhydrous tetrahydrofuran solvent under argon atmosphere followed purifi cation, similar to the procedure described in Reference. [ 22 ] In the second step, 1,4-benzenedicarboxaldehyde (796 mg, 5.94 mmol) and diglyme (20 ml) were added into the reaction mixture, [ 16,17,23 ] which was stirred at 160 °C for 72 hrs under argon atmosphere. After cooling it down to room temperature, the precipitated MTF-Fe was fi ltered and washed with an excess of anhydrous acetone, anhydrous tetrahydrofuran, and anhydrous dichloromethane.…”

Section: Methodsmentioning

confidence: 99%

“…[ 17 ] The results are also consistent with the X-ray photoelectron spectroscopic (XPS) data shown in A high resolution scan of the N1s orbital confi rms that nitrogen is coordinated with an iron atom. [ 16,18 ] The Fe 2p 3/2 peak at 710.36 eV reveals that iron is in the Fe(II) oxidation state. [ 19 ] The wide Fe 2p 3/2 spectrum and the satellite peak indicate a weak crystal fi eld that gives rise to a high spin state of Fe 2+ cations.…”

Section: Doi: 101002/admi201400107mentioning

confidence: 99%

“…[ 5,14,15 ] Melamine-terephthaldehyde based compounds with crosslinked porous organic frameworks were successfully synthesized recently. [ 16,17 ] These materials exhibit high thermal stability, large surface areas and high porosity. Similar to most MOF compounds, the melamine-terephthaldehyde based complexes display virtually no activity toward hydrogen at a near ambient temperature due to lack of active sites.…”

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confidence: 99%

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Room Temperature Hydrogen Physisorption on Exposed Metals in A Highly Cross‐Linked Organo‐Iron Complex

Pareek

Zhang

Rohan

et al. 2014

Adv Materials Inter

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ambient temperature range have been observed in a number of materials of this class. [ 9,11,12 ] To date, signifi cant hydrogen uptake at room temperature has only been observed in compounds of the latter two classes but none of the physisorption materials has been found to exhibit a hydrogen capacity that meets the gravimetric and volumetric targets set by the U.S. Department of Energy. [ 13 ] We note here that the surface area of class two materials is in general substantially smaller than that of class-one and class-three compounds with metal hydrazide gel materials as a typical example. [ 7,8 ] The highest hydrogen capacity of the class-three materials reported to date is 1.01 wt% at room temperature and 90 atm, in spite of the large surface area up to 5109 m 2 g −1 , likely attributed to the limited access of the active metal sites available to H 2 molecules. [ 14 ] Clearly, an appropriate porosity and abundant adsorption sites are two essential attributes required to induce strong physisorption at a near ambient temperature.In this Communication, we report an attempt to synthesize a complex with a moderate surface area and relatively dense under-coordinated iron metals for room temperature hydrogen storage via physisorption. The under-coordinated iron atoms, which serve as the active sites for hydrogen adsorption, are accommodated in a melamine-terephthaldehyde framework (MTF-Fe). The synthesized complex displays a wide range of nano-pores with a specifi c surface area up to 175 m 2 g −1 ; each iron atom is under-coordinated by formally forming only four bonds with the organic framework and is exposed on the walls of the nano-pores. This architecture facilitates diffusion and adsorption of hydrogen molecules in the network and enables storage to be realized via PSA at a near ambient temperature. Indeed, a measurement of hydrogen uptake yields a gravimetric storage capacity up to 1.7 wt% at 298K and 100 atm, substantially higher than the value for most MOF compounds and high surface area carbon materials and comparable to the hydrogen capacity of the best hydrogen physisorption materials reported to date under similar conditions. [ 5,14,15 ] Melamine-terephthaldehyde based compounds with crosslinked porous organic frameworks were successfully synthesized recently. [ 16,17 ] These materials exhibit high thermal stability, large surface areas and high porosity. Similar to most MOF compounds, the melamine-terephthaldehyde based complexes display virtually no activity toward hydrogen at a near ambient temperature due to lack of active sites. By adopting a similar synthesis protocol, schematically shown in Scheme 1 , but incorporating under-coordinated organo-iron species active to hydrogen molecules in the precursors, a material with a moderate surface area but numerous coordinatively unsaturated iron ions exposed on the walls of a polymeric network was then formed.The development of materials capable of storing hydrogen in high capacity via physical interaction at near ambient temperatures has long been recogni...

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Section: Doi: 101002/admi201400107mentioning

confidence: 60%

Section: Methodsmentioning

confidence: 99%

Section: Doi: 101002/admi201400107mentioning

confidence: 99%

mentioning

confidence: 99%

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Room Temperature Hydrogen Physisorption on Exposed Metals in A Highly Cross‐Linked Organo‐Iron Complex

Pareek

Zhang

Rohan

et al. 2014

Adv Materials Inter

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“…It has been reported that at a high temperature DMSO can decompose into low-boiling-point small molecules, such as formaldehyde and dimethylsulfide. These small molecules could act as pore-forming agent and promote the formation of porous structure [36,37]. Yin et al -eXPRESS Polymer Letters Vol.11, No.11 (2017) To check the pore-forming effect of the low-boilingpoint molecules, H 2 O or dioxane were added into the reaction system as cosolvent and the polycondesation temperature was kept at 140°C.…”

Section: Results and Discussion 31 Preparation And Pore Tailoring Omentioning

confidence: 99%

Simple synthesis of porous melamine-formaldehyde resins by low temperature solvothermal method and its CO2 adsorption properties

Yin¹,

Xu²,

Wang³

et al. 2017

Express Polym. Lett.

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Abstract.A simple and environmentally-friendly approach for the preparation of porous melamine-formaldehyde resins (PMFRs) was developed by using low-boiling-point solvents, such as water, as pore-forming agent. With using dimethyl sulfoxide (DMSO) and low-boiling solvents cosolvent method, PMFRs with a high specific surface area and well-defined pore structure can be synthesized at a low reaction temperature of 140°C for a short reaction duration in 20 hours, which can replace the conventional methods that use dimethyl sulfoxide (DMSO) as reaction medium and require 3 days at 170°C to achieve similar surface area. When loaded with polyethylenimine (PEI), the PMFR-PEI-30% showed good CO 2 adsorption performance with a capacity of up to 2.89 mmol/g at 30°C. These results bring new perspectives for the development of lowcost and environmentally-friendly synthetic methods for porous materials, which can boost their widespread applications.

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Microporous Polymers: Synthesis, Characterization, and Applications

Weber

Meng

2014

Encyclopedia of Polymer Science and Technology

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The present article gives an overview on current developments in the area of microporous polymers, that is polymers that have permanent pores of sizes below 2 nm. Basic concepts of the synthetic procedures are reviewed, and latest developments are discussed. Special interest is placed on developments that allow the synthesis of microporous polymers in well‐defined macroscopic morphologies such as particles, membranes, or monolithic structures. The various possibilities of microporosity characterization are discussed. Concepts adopted from the polymer membrane community such as positron annihilation lifetime spectroscopy or the zeolite community ( 129 Xe‐NMR, gas adsorption), as well as modern molecular modeling approaches are discussed. The various findings are combined, and open questions (which are still present in the field of microporous polymers) are pointed out. Latest developments regarding the application of microporous polymers in various technologies, ranging from adsorption science to optoelectronic and energy‐related applications are discussed finally. A critical comparison to other microporous materials such as zeolites or carbon is given, whenever appropriate.

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Facile synthesis of melamine-based porous polymer networks and their application for removal of aqueous mercury ions

Cited by 161 publications

References 63 publications

Room Temperature Hydrogen Physisorption on Exposed Metals in A Highly Cross‐Linked Organo‐Iron Complex

Room Temperature Hydrogen Physisorption on Exposed Metals in A Highly Cross‐Linked Organo‐Iron Complex

Simple synthesis of porous melamine-formaldehyde resins by low temperature solvothermal method and its CO2 adsorption properties

Microporous Polymers: Synthesis, Characterization, and Applications

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