	US 12,116,515 B1
	Method for synthesizing carbon quantum dots from macroalgae
Firoz Khan, Dhahran (SA); Masoud Al-Rasheidi, Dhahran (SA); and Mazen Khaled Nazal, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jun. 18, 2024, as Appl. No. 18/746,719.
Int. Cl. C09K 11/65 (2006.01); B82Y 20/00 (2011.01); B82Y 40/00 (2011.01); C01B 32/15 (2017.01)

CPC C09K 11/65 (2013.01) [C01B 32/15 (2017.08); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01); C01P 2002/82 (2013.01); C01P 2002/84 (2013.01); C01P 2002/85 (2013.01); C01P 2004/03 (2013.01); C01P 2004/04 (2013.01); C01P 2004/30 (2013.01); C01P 2004/38 (2013.01); C01P 2004/64 (2013.01); C01P 2006/60 (2013.01)]

15 Claims

1. A method for synthesizing carbon quantum dots, comprising:

reacting a mixture of a macroalgae and ethanol hydrothermally in an autoclave at a reaction temperature in a range of 150 degrees Celsius (° C.) to 250° C. for at least 12 hours to form a suspension; and

separating the carbon quantum dots from the suspension,

wherein the carbon quantum dots have a diameter of 1 to 5 nanometers (nm),

wherein the carbon quantum dots have a Stokes shift of at least 80 nm at an excitation wavelength of 270-410 nm.