JANUS CARBON NANOFLUIDS FROM WASTE PLASTICS AS SUSTAINABLE NANO-AGENTS FOR ENHANCED OIL RECOVERY

1 . A composition comprising:

Janus carbon nanoparticles dispersed in an aqueous-based oil recovery fluid, wherein each of the carbon nanoparticles comprises a hydrophobic surface and a hydrophilic surface.

2 . The composition of claim 1 , wherein the carbon nanoparticles are present in an amount ranging from 0.01 to 3.0 wt %.

3 . The composition of claim 1 , wherein the hydrophilic surface of the carbon nanoparticles comprises a hydrophilic surface functionality selected from the group consisting of a sulfonate, a hydroxide, and a combination thereof.

4 . The composition of claim 1 , wherein the aqueous-based fluid comprises one or more additives selected from the group consisting of surfactants, stabilizers, and combinations thereof.

5 . The composition of claim 1 , wherein the carbon nanoparticles have an average particle size ranging from 5 to 500 nm.

6 . A method of preparing an enhanced oil recovery fluid comprising;

carbonizing waste plastic material to provide carbon microparticles;

after the carbonizing, functionalizing the carbon microparticles through a sulfonating process thereby providing the carbon microparticles comprising a hydrophilic surface functionality;

after the functionalizing, grinding the carbon microparticles to provide carbon nanoparticles having asymmetric surface functionality, wherein the carbon nanoparticles comprise a hydrophilic surface from the sulfonating process and a hydrophobic surface from a core of the carbon microparticles; and

mixing the carbon nanoparticles with an aqueous-based fluid to provide the enhanced oil recovery fluid.

7 . The method of claim 6 , wherein the waste plastic material comprises a polymer selected from the group consisting of polypropylene (PP), polystyrene (PS), acrylonitrile butadiene styrene (ABS), polyethylene terephthalate (PET), polyester (PES), polyamide (PA), polyvinyl chloride (PVC), polyurethane (PU), polycarbonate (PC), polyvinylidene chloride (PVDC), polyethylene (PE), and combinations thereof.

8 . The method of claim 6 , wherein the waste plastic material is a plastic water bottle.

9 . The method of claim 6 , wherein pyrolytic carbonizing the waste plastic material comprises heating the waste plastic material at a temperature ranging from 300 to 550° C.

10 . The method of claim 6 , wherein the carbon microparticles have an average particle size ranging from 5 to 20 mm.

11 . The method of claim 6 , wherein the carbon nanoparticles comprise a hydrophilic surface functionality selected from the group consisting of a sulfonate, a hydroxide, and a combination thereof.

12 . The method of claim 6 , wherein grinding the carbon microparticles comprises ball milling the carbon microparticles.

13 . The method of claim 6 , wherein the aqueous-based fluid comprises one or more additives selected from the group consisting of surfactants, stabilizers, and combinations thereof.

14 . A method of enhanced oil recovery comprising:

introducing an enhanced oil recovery fluid into a hydrocarbon-bearing formation, wherein the enhanced oil recovery fluid comprises carbon nanoparticles comprising a hydrophilic surface and a hydrophobic surface;

displacing hydrocarbons from the hydrocarbon-bearing formation; and

recovering the hydrocarbons.

15 . The method of claim 14 , wherein the carbon nanoparticles are present in an amount ranging from 0.01 to 3.0 wt %.

16 . The method of claim 14 , wherein the carbon nanoparticles have an average particle size ranging from 5 to 500 nm.