Material for removing contaminants from water

1. A composite comprising a carbonaceous support and a metallic nanotube conjugated with the carbonaceous support,

wherein the metallic nanotube comprises titanate, and

wherein the metallic nanotube further comprises carbon nanoparticles on the surface of the metallic nanotube.

2. The composite of claim 1 , wherein the carbonaceous support comprises charcoal selected from the group consisting of activated charcoal, powder activated charcoal, activated carbon fibers, biochar, and mixtures thereof.

3. The composite of claim 1 , wherein the titanate has a basic structure of Na x H 2-x Ti 3 O 7 , wherein x=0-0.75.

4. The composite of claim 3 , wherein the titanate comprises a skeletal structure and one or more interlayers,

wherein the skeletal structure comprises corrugated ribbons of triple edge-sharing TiO 6 , and wherein the one or more interlayers comprise H + , Na + , or a combination of both.

5. The composite of claim 1 , wherein the composite has XRD peaks at 2θ of about 24°, about 28°, about 48°, and about 62°.

6. The composite of claim 1 , wherein the carbonaceous support comprises a plurality of pores and each pore of the plurality of pores has a diameter of about 2 nm to about 50 nm.

7. The composite of claim 1 , wherein the metallic nanotube has an inner diameter of about 2 nm to about 10 nm.

8. The composite of claim 1 , wherein the metallic nanotube further comprises a dopant.

9. The composite of claim 1 , wherein the carbon nanoparticles are grafted on the surface of the metallic nanotube.

10. The composite of claim 1 , wherein the carbonaceous support and the metallic nanotube are in a mass ratio of about 4:1 to about 0.5:1.

11. The composite of claim 1 , wherein the carbon nanoparticles perform as carbon quantum dots.

12. A method of removing one or more contaminants from water, the method comprising the step of contacting a composite according to claim 1 with a contaminant to form a composite-contaminant complex, wherein the contaminant is a hydrocarbon or a heavy metal.

13. The method of claim 12 , wherein the hydrocarbon is selected from the group consisting of aromatic hydrocarbons, polyaromatic hydrodrocarbons, alkyl hydrocarbons, and halogenated hydrocarbons and the heavy metal is lead, copper, cadmium, mercury, nickel, cobalt, or uranium.

14. The method of claim 12 , comprising regenerating the composite.

15. The method of claim 14 , wherein the step of regenerating comprises degrading the contaminant by exposing the composite-contaminant complex to light.

16. The method of claim 12 , wherein the composite is not fouled by dissolved organic matter.