Graphene‐Based Porous Silica Sheets Impregnated with Polyethyleneimine for Superior CO<sub>2</sub> Capture

Yang, Shubin; Zhan, Liang; Xu, Xiaoyue; Wang, Yanli; Ling, Licheng; Feng, Xinliang

doi:10.1002/adma.201204427

Cited by 145 publications

(85 citation statements)

References 29 publications

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“…Due to their ultrahigh pore volume, exfGO-D samples can accept a record high TETA loading of z10 g g À1 of sample, without any sign of surface wetting (Table S6 †). 4,7,8,[13][14][15][21][22][23][24][25][26][27][28] Indeed, SEM micrographs still show void spaces for a TETA loading as high as 7.0 g g À1 in the exfGO-D sample (Fig. S26 †).…”

Section: 7813-1521-28mentioning

confidence: 92%

“…5b). 4,7,8,[13][14][15][21][22][23][24][25][26][27][28]32,33 Here it is worth noting that the capacity loss of z21% in our TEPA@exfGO sample is arguably smaller than the z40% capacity loss from TEPA@mesoporous silica capsules, under similar synthetic and experimental conditions.…”

Section: 7813-1521-28mentioning

confidence: 93%

“…5 and S41 †). 28 Furthermore, a volumetric CO 2 uptake capacity of 6.4 mmol g À1 (z28 wt%) in the exfGO-D Â 6.0TEPA…”

Section: 7813-1521-28mentioning

confidence: 99%

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Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

Gadipelli

Skipper

et al. 2017

J. Mater. Chem. A

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We demonstrate a simple and fully scalable method for obtaining hierarchical hyperporous graphene networks of ultrahigh total pore volume by thermal-shock exfoliation of graphene-oxide (exfGO) at a relatively mild temperature of 300 C. Such pore volume per unit mass has not previously been achieved in any type of porous solid. We find that the amount of oxidation of starting graphene-oxide is the key factor that determines the pore volume and surface area of the final material after thermal shock. Specifically, we emphasize that the development of the hyperporosity is directly proportional to the enhanced oxidation of sp 2 C]C to form C]O/COO. Using our method, we reproducibly synthesized remarkable meso-/macroporous graphene networks with exceptionally high total pore volumes, exceeding 6 cm 3 g À1. This is a step change compared to #3 cm 3 g À1 in conventional GO under similar synthetic conditions.Moreover, a record high amine impregnation of >6 g g À1 is readily attained in exfGO samples (solid-amine@exfGO), where amine loading is directly controlled by the pore-structure and volume of the host materials. Such solid-amine@exfGO samples exhibit an ultrahigh selective flue-gas CO 2 capture of 30-40 wt% at 75 C with a working capacity of z25 wt% and a very long cycling stability under simulated flue-gas stream conditions. To the best of our knowledge, this is the first report where a graphene-oxide based hyperporous carbon network is used to host amines for carbon capture application with exceptionally high storage capacity and stability.The widespread implementation of clean energy technologies, such as CCS (carbon capture and sequestration), fuel cells, batteries, supercapacitors, water electrolysers, and/or molecular storage and transport, is critical to tackle climate change and energy security issues. [1][2][3][4][5] In this regard, nanoporous carbons, metal-organic frameworks (MOFs), polymers and zeolites have gained tremendous attention as storage, transport and conversion media.2-7 Considerable performance improvements have been achieved by synthesizing and manipulating their functional features and porous structures.6 In the case of CO 2 capture, obtaining high enough CO 2 uptake capacities by using sorbent based materials under ue-gas conditions is still a challenging task. Many sorbent materials show good CO 2 uptake capacities but only at 0 C or 25 C and for 100% dry CO 2 .Porous sorbents including zeolites, activated carbons and MOFs do not show desirable selective CO 2 uptake under humid conditions and/or at >50 C. 8 This is a major setback for the implementation of CCS. The recent efforts on the introduction of CO 2 -philic amine groups into nanoporous structures have led to a large enhancement in selective carbon (CO 2 ) capture and effluent ue-gas tolerance. 4,7,8 However, the practical feasibility of these materials for CO 2 capture is compromised by the lack of a simple and large-scale synthesis method. Substantial improvements in both the structural stability and scalable synthesis of these...

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Section: 7813-1521-28mentioning

confidence: 92%

Section: 7813-1521-28mentioning

confidence: 93%

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Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

Gadipelli

Skipper

et al. 2017

J. Mater. Chem. A

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“…However, the CO 2 adsorption capacity of the sample was stable throughout all the cycles. Superior regeneration properties of the sample could be ascribed to the endothermic properties of the graphene sheets in MWCNTs, preventing the heat induced transformation of amine groups [43].…”

Section: Co 2 Adsorption/regenerationmentioning

confidence: 99%

Preparation and characterization of multi-walled carbon nanotubes impregnated with polyethyleneimine for carbon dioxide capture

Lee

Park

2015

International Journal of Hydrogen Energy

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“…The first approach includes in situ polymerization of reactive amine monomersi nside the porous materiala nd co-condensation of amine-containing compounds with the silica precursor duringm esoporous materialp reparation. [25][26][27][28][29][30][31][32][33][34] One typical example of amine-impregnated solid sorbentsi st he "molecular basket" sorbents (MBS) developed first by Song and co-workersa tP enn State. [19][20][21][22][23][24] The third approachi st oi mmobilize the amine polymer onto the nanoporous materials by using wet impregnation methods.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO₂ Capture from Flue Gas

Wang

Song

2017

ChemPhysChem

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Polyallylamine (PAA)-based molecular basket sorbents (MBS) have been studied for CO capture in comparison with polyethylenimine (PEI)-based MBS. The characterizations including N physisorption, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and thermogravimetric analysis (TGA) showed that PAA (M =15 000) is more rigid and has more steric hindrance inside SBA-15 pores than PEI owing mainly to its different polymer structure. The effects of temperature and PAA loading on the CO sorption capacity of PAA-based MBS have been examined by TGA by using 100 % CO gas stream and compared with PEI/SBA-15. It was found that the capacity of the PAA/SBA-15 sorbent increased with increasing temperature. The optimum capacity of 88 mg g was obtained at 140 °C for PAA(50)/SBA-15 whereas the optimum sorption temperature was 75 and 90 °C for PEI-I(50)/SBA-15 (PEI-I, M =423) and PEI-II(50)/SBA-15 (PEI-II, M =25 000), respectively. The capacity initially increased with the increase of PAA loading and then dropped at high amine contents, owing to the increased diffusion barrier. The highest CO capacity of 109 mg g was obtained at a PAA loading of 65 wt %, whereas the PAA(50)/SBA-15 sorbent gave the best amine efficiency of 0.23 mol mol . The effect of moisture was examined in a fixed-bed flow system with simulated flue gas containing 15 % CO and 4.5 % O in N . It was found that the presence of moisture significantly enhanced CO sorption over PAA(50)/SBA-15 and greatly improved its cyclic stability and regenerability. Compared with PEI/SBA-15, PAA/SBA-15 possesses a better thermal stability and higher resistance to oxidative degradation. However, the CO sorption rate over the PAA(50)/SBA-15 sorbent was much slower.

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Graphene‐Based Porous Silica Sheets Impregnated with Polyethyleneimine for Superior CO₂ Capture

Cited by 145 publications

References 29 publications

Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

Preparation and characterization of multi-walled carbon nanotubes impregnated with polyethyleneimine for carbon dioxide capture

Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO₂ Capture from Flue Gas

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Graphene‐Based Porous Silica Sheets Impregnated with Polyethyleneimine for Superior CO2 Capture

Cited by 145 publications

References 29 publications

Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

Preparation and characterization of multi-walled carbon nanotubes impregnated with polyethyleneimine for carbon dioxide capture

Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO2 Capture from Flue Gas

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Product

Resources

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Graphene‐Based Porous Silica Sheets Impregnated with Polyethyleneimine for Superior CO₂ Capture

Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO₂ Capture from Flue Gas