Abstract:Light hydrocarbon separation is a crucial process associated with high energy expenditure in the petrochemical industry. The utilization of porous organic materials as solid porous adsorbents for light hydrocarbon separation has found widespread attention because of the advantages of low cost, excellent stability, and good recyclability. Here, we present the facile synthesis of a porous organic material, constructed from pyridine‐triphenylborane by using a Friedel‐Crafts alkylation coupling reaction, affording… Show more
“…The porous material possesses high specific surface area inside, which can produce abundance of adsorption sites. [ 30–35 ] This structural feature is beneficial to improve the efficiency of ice purification. Obviously, the morphology of the internal pores has an influence on the purification efficiency.…”
Freshwater resources are currently insufficient, and another form of freshwater resources, namely, ice, is very interesting except for the issue of how to use new materials for effective purification during the processing procedure. In this article, a new membrane material with multisize pore structure in the cross‐section and intact thin skin layer on the upper and lower surfaces was successfully prepared by adding porogen, filler and setting heating environment during the phase separation process. The membrane exhibits excellent axial deformability, and its elongation at break can reach to 160% strain. Meanwhile, they all show elastic deformation behavior in the range from −60 to 100°C. Even if high content of hydrophobic filler is compounded into these membranes, that is, 5.7 wt% carbon tube content, water contact angle of membrane's surface is only 72.5°, demonstrating obvious hydrophilicity. In addition, in the water purification process, the adsorption rate constant reached ideal value of 0.26 s−1, and the equilibrium adsorption capacity was about 2.8 g/g, showing fast and efficient water purification ability. In the mode of external heating source or the membrane's heat dissipation, these prepared membranes can melt the ice to obtain purified water and exhibit a controllable purification ability in this process.
“…The porous material possesses high specific surface area inside, which can produce abundance of adsorption sites. [ 30–35 ] This structural feature is beneficial to improve the efficiency of ice purification. Obviously, the morphology of the internal pores has an influence on the purification efficiency.…”
Freshwater resources are currently insufficient, and another form of freshwater resources, namely, ice, is very interesting except for the issue of how to use new materials for effective purification during the processing procedure. In this article, a new membrane material with multisize pore structure in the cross‐section and intact thin skin layer on the upper and lower surfaces was successfully prepared by adding porogen, filler and setting heating environment during the phase separation process. The membrane exhibits excellent axial deformability, and its elongation at break can reach to 160% strain. Meanwhile, they all show elastic deformation behavior in the range from −60 to 100°C. Even if high content of hydrophobic filler is compounded into these membranes, that is, 5.7 wt% carbon tube content, water contact angle of membrane's surface is only 72.5°, demonstrating obvious hydrophilicity. In addition, in the water purification process, the adsorption rate constant reached ideal value of 0.26 s−1, and the equilibrium adsorption capacity was about 2.8 g/g, showing fast and efficient water purification ability. In the mode of external heating source or the membrane's heat dissipation, these prepared membranes can melt the ice to obtain purified water and exhibit a controllable purification ability in this process.
“…These results indicate the great potential of HCP-B in light hydrocarbon separation.Figure 3.The synthesis of HCP-B. 20 …”
Section: Electrophilic Reactionsmentioning
confidence: 80%
“…The Friedel-Crafts alkylation reaction has been primarily used to prepare porous organic polymer materials in the past, too [17][18][19] which is closely related to the mild reaction conditions, cheap and readily available monomers and catalysts, and high yields. Recently, Lingchang Jiang et al 20 synthesized the hyper crosslinked polymer (HCP-B) by the Friedel-Crafts alkylation of pyridine-triphenylborane (Figure 3). HCP-B has remarkable thermal stability and high surface area.…”
With the development of polymer science, more and more named reactions have been applied to synthesizing polymers. Introducing new reactions into polymer synthesis is undoubtedly an excellent expansion for monomer and polymer libraries. In this review, the named reactions employed in polymer-chain synthesis were divided into seven types: electrophilic reactions, nucleophilic reactions, transition metal-mediated cross-coupling reactions, free radical reactions, pericyclic reactions, multi-component reactions and rearrangement reactions. The discussion was mainly focused on the progress in the utilization of these named reactions in polymer synthesis, which could be a valuable reference for researchers in the polymer field.
“…CNSL‐HCPs prepared in this article exhibit lower porosity compared to other porous materials. [ 10 ] This can be explained as follows: FeCl 3 catalyst used in the preparation of CNSL‐HCPs have lower activity than AlCl 3 used in the synthesis of other HCPs, and the lower activity caused a slower rate of cross‐linking and higher degree of free packing for building blocks, thus leading to a lower porosity. [ 30 ] In addition, the structure of the monomers also affects the porosity, there are longer skeleton branches in CNSL, and the interlacing of backbone chains affects the growth of pore channels in the inner space, resulting in a lower porosity.…”
Section: Resultsmentioning
confidence: 99%
“…As a new type of microporous materials, HCPs have attracted a particular attention due to their unique properties such as high chemical stability, easy regeneration, and great adsorption capacities. [ 10–13 ] Compared with commercial microporous AC, HCPs are better adsorbents in reducing the release of organic vapors, especially under humid conditions. [ 14 ] As the earliest HCPs, Davankov resins obtained with Friedel–Crafts reactions have realized commercial production.…”
Hypercrosslinked polymers (HCPs) have aroused considerable attention due to their high chemical stability and potential applications in adsorption. A series of HCPs were prepared via one-step solvent knitting method using the cashew nut shell liquid (CNSL) as bio-based building block. Characterization of the prepared samples was performed by N 2 adsorption, Fourier transform infrared, Raman spectra, solid-state 13 C NMR spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy, and transmission electron microscopy images. Depending on the N 2 adsorption, the as-prepared CNSL-HCP4 exhibits the highest specific surface area of 93 m 2 Ág À1 and displays a uniform pore-size distribution. TGA results show that the decomposition temperature of the polymers exceeds 350 C. More significantly, the dynamic adsorption of high concentration of volatile organic compounds (VOCs) was investigated with CNSL-HCP4 under dry and humid conditions. The results show that the maximum adsorption capacity of o-xylene under dry conditions is 217 mgÁg À1 and its corresponding adsorption amount (208 mgÁg À1 ) decreases slightly under 30% relative humidity condition, indicating that CNSL-HCP4 had a hydrophobic surface. A little decrease in adsorption capacity of o-xylene on CNSL-HCP4 after five recycles confirms the reusability of the CNSL-HCPs. Therefore, CNSL-HCP4 is considered to be a promising candidate for potential adsorbent in recycling the VOCs from the exhaust.
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