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Supporting online materials for
Compressive, ultralight and fire-resistant lignin-modified
graphene aerogels as recyclable absorbents for oil and
organic solvents
Changzhou Chen, Fengfeng Li, Yanru Zhang, Bingxin Wang, Yongming Fan, Xiluan Wang* and Runcang Sun
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, P. R. China.
*Corresponding author: Tel: +86-10-62336903; Fax: +86-10-62336903
E-mail address: [email protected]
Fig. S1. The AFM image and height of GO sheets in this work.
Fig. S2. The solubility of (a) lignin and (b) GO sheets in pure water, pure alcohol and
alcohol solution (60%).
Fig. S3. (a) The nitrogen adsorption and desorption isotherms in Brunauer-Emmett-
Teller (BET) measurement. The pore size distribution of LGA calculated by (b)
Barrett-Joyner-Halenda (BJH) method and (c) mercury intrusion porosimetry (MIP)
method.
Fig. S4. The SEM images of the composite aerogels obtained from different feeding
ratio of lignin and GO, (a) 0:1, (b) 0.4:1, (c) 0.8:1 and (d) 1.2:1.
Fig. S5. Optical image of water droplet on the surface of the GA in contact angle
measurement.
Fig. S6. Absorption capacities of the LGAs in absorbing toluene after several
compression and release cycles.
Fig. S7. The dimensions of LGA before (a) and after (b) carbonization.
Fig. S8. SEM images of LGA (a) before and (b) after oil recycling after 10 cycles.
Fig. S9. The absorption and squeezing processes of LGA for absorbing dodecane in
an reuse cycle.
Fig. S10. Absorption capacities of the LGAs in absorbing dodecane after 20
squeezing cycles.
Table S1. Physical properties of GA and LGA.
Samples Density
(mg cm −3)
C/O
ratio
Maximum stress at
70% strain ( Pa)
Contact
angle
Porosity
(%)
GA 8.2 6.52 379 108° 94.3
LGA 3.0 5.15 275 127° 95.4
Table S2. Comparison of various graphene-based absorbent materials.
Sorbents Absorbates Capacity (g
g −1)
Ref.
N-doped graphene
framework
oils and organic
solvents
200–600 15
graphene-carbon nanotube
aerogels
oils and organic
solvents
215–913 18
Polydopamine-functionalized
carbon nanotubes-graphene
aerogel
oils and organic
solvents
125–533 44
Pure spongy graphene oils and organic
solvents
20–86 S1
rGO coated polyurethane
sponges
oils and organic
solvents
80–160 S2
Cu nanoparticles modified
graphene-based aerogels
Oils 28–40 S3
Graphene-polyvinylidene
fluoride aerogels
oils and organic
solvents
20–70 S4
Poly(acrylic acid)-rGO
Aerogels
oils 105–150 S5
Graphene aerogels oils and organic
solvents
110–240 S6
Graphene-based sponges oils and organic
solvents
54–165 S7
Graphene- Nanoribbon
Aerogels
oils and organic
solvents
121–302 S8
Dopamine modified graphene
aerogels
oils and organic
solvents
134–283 S9
Carbon nanotubes-graphene
hybrid aerogel
oils and organic
solvents
100–322 S10
Graphene oxide/nanofiber
aerogel
oils and organic
solvents
230–734 S11
Table S3. Comparison of various biomass-based absorbent materials.
Sorbents Absorbates Capacity Ref.
(g g −1)Lignin-based xerogel Oils and organic
solvents
19–47 31
Lignin-based
polyurethane/graphene oxide
foam
Oils and organic
solvents
26–68 33
lignin-melamine sponge Oils and organic
solvents
98–218 30
Cellulose-based aerogels Oils and organic
solvents
58–101 46
Carbon microbelt Aerogel Oils and organic
solvents
56–188 20
Nanocellulose carbon aerogel Oils 56–88 47Kapok fiber Organic solvents 21–30 45
Lignin-modified graphene
aerogels (LGA)
Oils and organic
solvents
167–350 Present
studyCarbonated lignin-modified
graphene aerogels (C-LGA)
Oils and organic
solvents
254–522 Present
study
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