US 12,102,947 B1
Biodegradable air filter from date palm and method of fabrication thereof
Tarek Ahmed Yousef, Riyadh (SA); Osamah Abdulrahman Aldaghri, Riyadh (SA); and Saad Shaaban, Riyadh (SA)
Assigned to IMAM MOHAMMAD IBN SAUD ISLAMIC UNIVERSITY, Riyadh (SA)
Filed by IMAM MOHAMMAD IBN SAUD ISLAMIC UNIVERSITY, Riyadh (SA)
Filed on May 16, 2024, as Appl. No. 18/665,929.
Int. Cl. B01D 39/18 (2006.01); B01D 39/20 (2006.01); B01D 46/00 (2022.01); B01D 46/54 (2006.01); B01J 20/20 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); D21C 3/02 (2006.01); D21C 9/00 (2006.01); D21C 9/02 (2006.01); D21H 11/12 (2006.01); D21H 11/18 (2006.01); D21H 17/00 (2006.01); D21H 17/53 (2006.01); D21H 21/22 (2006.01); D21H 27/08 (2006.01); D21C 11/00 (2006.01); D21C 11/12 (2006.01); D21H 17/63 (2006.01)
CPC B01D 39/18 (2013.01) [B01D 39/2062 (2013.01); B01D 46/0001 (2013.01); B01D 46/0036 (2013.01); B01D 46/543 (2013.01); B01J 20/20 (2013.01); B01J 20/28028 (2013.01); B01J 20/2803 (2013.01); B01J 20/3007 (2013.01); B01J 20/3042 (2013.01); B01J 20/3071 (2013.01); B01J 20/3078 (2013.01); B01J 20/3085 (2013.01); D21C 3/02 (2013.01); D21C 9/001 (2013.01); D21C 9/002 (2013.01); D21C 9/02 (2013.01); D21H 11/12 (2013.01); D21H 11/18 (2013.01); D21H 17/53 (2013.01); D21H 17/74 (2013.01); D21H 21/22 (2013.01); D21H 27/08 (2013.01); B01D 2239/025 (2013.01); B01D 2239/0266 (2013.01); B01D 2239/0283 (2013.01); B01D 2239/0407 (2013.01); B01D 2239/086 (2013.01); B01D 2239/10 (2013.01); B01D 2239/1291 (2013.01); D21C 11/0007 (2013.01); D21C 11/125 (2013.01); D21H 17/63 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of fabricating a biodegradable air filter, comprising:
isolating cellulose nanofibers from a bleached date palm tree composition obtained by treating date palm solids with a solution comprising NaOH at a temperature of 125 to 175° C.;
preparing a first carbon by heating a date processing waste under an inert atmosphere at a temperature of 500 to 600° C.;
heating the first carbon with NaOH under an inert atmosphere at a temperature of 700 to 800° C. to form a second carbon;
washing the second carbon with water and drying to form an activated carbon;
mixing the cellulose nanofibers with water and sonicating for 1 to 5 minutes at 300 to 700 watts (W) to form a first suspension;
mixing the activated carbon with the first suspension to obtain a second suspension;
adding an aqueous solution of a polyalkylene glycol binder to the second suspension to obtain a solvent mixture;
sonicating the solvent mixture for 2 to 10 minutes at 300 to 700 W;
filtering the solvent mixture on a porous substrate to obtain a layer; and
drying the layer at a temperature of 100 to 120° C. for 0.5 to 2 hours to obtain the biodegradable air filter in the form of a solidified structure.