All-carbon film based on activated carbon and preparation method and use thereof
The present disclosure provides an activated carbon-based all-carbon membrane (ACM), which is formed by using activated carbon as a base material and graphene as a crosslinking agent for connection, and can stably exist independent of a substrate. The membrane surface pore structure can be adjusted by the addition proportion of graphene, and the membrane surface pore size can be adjusted from micron-scale to nano-scale. The preparation method of ACM comprises uniformly mixing and then filtering an activated carbon dispersion and a graphene dispersion, then the graphene and the activated carbon are assembled on the membrane filter substrate. The membrane can be used in the fields such as water and air purification, chemical catalysis, and energy reservation.
1 . An activated carbon-based all-carbon membrane (ACM) for water purification for Chlorella E. coli , nano silica, and nanosilver, comprising:
a plurality of activated carbon particle as basic material, and a graphene as crosslinking agent;
the graphene is reduced graphene oxide that forms a plurality of discrete graphene oxide sheets to separately link one of the activated carbon particles to another of the activated carbon particles; wherein the mass ratio of the graphene to the activated carbon is 7%;
the thickness of the ACM is capable of being regulated by an addition amount of the activated carbon;
a pore structure of the ACK has a water flux of 45.36 L/m 2 /h/bar;
an air contact angle of the ACM is 25.4°; and
a surface pore size of the ACM is 24 nm-70 nm.
2 . The activated carbon-based all-carbon membrane of claim 1 , wherein the activated carbon is granular and forms the all-carbon membrane without supporting structure, through π-π interaction force between the activated carbon and the graphene.
3 . The activated carbon-based all-carbon membrane of claim 1 , wherein the thickness of the membrane can be regulated by the addition amount of activated carbon, and the more the activated carbon is added, the thicker the membrane becomes and the larger adsorption capacity the membrane has.
4 . The activated carbon-based all-carbon membrane of claim 1 , wherein the size of the activated carbon particles is micro-scale.
5 . A method for preparing the activated carbon-based all-carbon membrane (ACM) for water purification of Chlorella E. coli , nano silica, and nanosilver according to claim 1 , comprising the following steps:
dispersing activated carbon in water to form an activated carbon dispersion;
adding a graphene dispersion into the activated carbon dispersion to form a mixed solution, the graphene dispersion being a reduced graphene oxide dispersion having a plurality of discrete graphene oxide sheets; wherein ID and IG of Raman spectra for the graphene dispersion is equal to or smaller than 0.91; the concentration of graphene in the graphene dispersion is in the range of 0.05-1 mg/mL; the pH of the graphene dispersion is 11;
providing the mixed solution in a pressure filter, with nitrogen as a pressurized gas, a pressure range of 0.05-0.6 Mpa; and
filtrating the mixed solution wherein graphene from the graphene dispersion and the activated carbon from the activated carbon dispersion are assembled on a membrane filter substrate to form the activated carbon-based all-carbon membrane; wherein the mass ratio of the graphene to the activated carbon is 6%-10%.
6 . The method of claim 5 , wherein the activated carbon is micro-scale.
7 . The method of claim 5 , wherein during the activated carbon dispersion process, the pH is adjusted to alkaline.
8 . The method of claim 5 , wherein the graphene dispersion is obtained by a partial reduction of a graphene oxide dispersion.
9 . The method of claim 5 , wherein the mixed solution is placed in a pressure filter, and the ACM is formed on the membrane filter substrate by pressure filtration.
10 . The method of claim 5 , wherein the activated carbon is granular and fully dispersed in the water under the action of ultrasound to obtain the activated carbon dispersion.
11 . The method of claim 5 , wherein the filtration is finished within 30 minutes.
12 . A water purification device comprises the activated carbon-based all-carbon membrane according to claim 1 .
13 . The activated carbon-based all-carbon membrane (ACM) of claim 1 , wherein the water purification includes removal of pollutants in water by one-step filtration; the pollutants includes chlorella, E. coli , nano silica, nanosilver particles, heavy metal ions (Ag+), dye (MB), and aromatic pollutant (PHE).
14 . The method according to claim 5 , wherein a pore diameter of the membrane filter substrate of 0.22.