CIESC Journal ›› 2019, Vol. 70 ›› Issue (1): 280-289.doi: 10.11949/j.issn.0438-1157.20180603

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Saturated adsorption capacities of graphene aerogels on organics

Hui e LIU(),Yangfan HUANG,Yanbing MA,Shuang CHEN   

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, China
  • Received:2018-06-01 Revised:2018-11-05 Online:2019-01-05 Published:2018-11-12
  • Contact: Hui e LIU E-mail:liuhuie@upc.edu.cn

Abstract:

Graphene aerogel (GA) was prepared through Pickering emulsion method. Pure organic compounds and oil emulsion in water were used as substances to be absorbed by GA. Saturated adsorption capacities were observed for the GA prepared in this work and for carbon aerogels from other researchers. It was found that the saturated adsorption capacities of almost all the carbon aerogels were directly proportional to densities of the organics, indicating constant adsorption volume of organics exists for certain carbon aerogel, independent of the kind of organics. It is expected that the adsorption of organics by carbon aerogels is a volume filling process, so that higher pore volume of aerogels favors the saturated adsorption abilities of organics. However, occupancy of pores, or the filling percent of pores by organics is also an important determining factor. The prepared GA has lower adsorption capacity for oil in water than its adsorption capacity for pure oil, and should be related to competitive adsorption of water and diffusion resistance of organic matter.

Key words: aerogel, graphene, nanomaterials, adsorption, organic compounds

CLC Number: 

  • O 647.3

Fig.1

Increase of publication number from year of 2000"

Fig.2

FT-IR spectra of GO and GA"

Fig.3

XRD patterns of GO and GA"

Table 1

Saturated adsorption capacities of carbon aerogels"

No.

Aerogel

type

Adsorbate Adsorption capacity/(g·g?1) Ref.
1 hybrid foam of graphene and carbon nanotube compressor oil 85 [9]
sesam oil 102
chloroform 105
toluene 130
DMF 105
dichlorobenzene 131
2 graphene sponge diesel oil 129 [10]
vegetable oil 96
chloroform 154
ethylene glycol 131
acetic ester 93
ethanol 79
n-heptane 76
3 ultra-flyweight aerogel crude oil 289 [11]
motor oil 341
vegetable oil 418
ethanol 350
n-hexane 215
toluene 350
1,4-dioxane 489
1-butyl-3-methylimidazolium tetrafluoroborate 527
chloroform 568
phenixin 743
4 graphene aerogel n-hexane 120 [17]
n-dodecane 140
ethanol 143
turpentine oil 162
tributyl phosphate 170
N-mehtyl pyrrolidone 173
ethylene glycol 182
dichloromethane 196
carbon tetrachloride 250
5 graphene aerogel n-hexane 138 [18]
n-heptane 142
vegetable oil 193
pump oil 187
white oil 193
acetone 161
ethanol 158
6 graphene sponge petroleum ether 510 [19]
acetone 710
ethanol 660
toluene 720
pump oil 1010
N-methyl pyrolidone 755
7 graphene/nanofiber aerogel phenixin 735 [20]
chloroform 642
dichloroethane 515
dioxane 471
olive oil 390
pump oil 381
toluene 377
p-xylene 355
ethanol 312
n-hexane 230
8 graphene aerogel n-heptane 122 this work
cyclohexane 138
methylbenzene 150
N,N-dimethylformamide 164
dibutyl phthalate 170
propanetriol 194
phenixin 237
aviation kerosene 140

Fig.4

Saturated adsorption capacities of GA vs densities of organics"

Fig.5

Relations between adsorption capacity of carbon aerogels and densities of organics from literatures"

Table 2

Fitting results of adsorption capacities from different researchers"

No. Type of aerogel

Slope/

(cm3·g?1)

R 2 Pore volume/(cm3·g?1) Pore occupancy/% Ref.
M1 hybrid foam of graphene and carbon nanotube 98.57 0.9346 144.05 68.43 [9]
M2 ultra-flyweight aerogel 423.37 0.9877 713.83 59.31 [11]
M3 graphene aerogel 147.28 0.9958 321.92 45.75 [12]
M4 graphene aerogel 166.20 0.9940 166.00 100.12 [17]
M5 graphene aerogel 209.5 0.9992 237.64 88.15 [18]
M6 graphene sponge 759.57 0.9861 999.55 75.99 [19]
M7 graphene / nanofiber aerogel 432.4 0.9961 555.10 77.90 [20]
M8 graphene nanoribbon aerogel-1 44.67 0.9734 45.00 99.27 [21]
M9 graphene nanoribbon aerogel-2 111.91 0.9968 132.88 84.22 [21]
M10 polydimethylsiloxane modified graphene nanoribbon aerogels 196.78 0.9969 399.55 49.25 [21]
M11 graphene - carbon nanotube composite aerogel 87.01 0.9984 103.28 84.25 [22]
M12 carbon nanofiber aerogel 185.76 0.9880 199.56 93.08 [24]
M13 nitrogen-doped graphene aerogel 117.45 0.9844 199.55 58.86 [23]
M14 reduced graphene coated polyamides sponge 106.75 0.9919 113.20 94.30 [25]
M15 graphene oxide coated polyurethane sponge 92.94 0.9941 110.66 83.99 [25]
M16 carbon nanotube / graphene hybrid aerogel 138.50 0.9831 [26]
M17 N-doped graphene aerogel 71.39 0.9758 85.01 83.96 [27]
M18 graphene foam 24.77 0.9192 [28]
M19 carbon fiber aerogel 79.27 0.9863 82.88 95.64 [29]
M20 graphene-carbon nanotube aerogel 37.82 0.9989 [30]
M21 graphene aerogel 160.57 0.9943 169.61 94.67 this work

Fig.6

Breakthrough curve of GA bed"

Fig.7

Images of graphene aerogels after adsorption"

Fig.8

Hydrophobic analysis for GA"

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