US 12,447,441 B2
Process for obtaining polyamide membrane with nanostructured coating, membranes and use
Rodrigo Suhett De Souza, Ilha do Fundão (BR); Ricardo De Araujo Cid Da Silva, Ilha do Fundão (BR); Yara Luiza Brasil Zanon, Pampulha (BR); Vinícius Gomide De Castro, Pampulha (BR); Miriam Cristina Santos Amaral Moravia, Pampulha (BR); Glaura Goulart Silva, Pampulha (BR); Bruna Caroline De Jesus Ribeiro, Pampulha (BR); and Ana Luiza Silvestre Assis, Pampulha (BR)
Assigned to Petróleo Brasileiro S.A.—Petrobras, Rio de Janeiro (BR); and Universidade Federal De Minas Gerais—UFMG, Belo Horizonte (BR)
Filed by Petróleo Brasileiro S.A.—Petrobras, Rio de Janeiro (BR); and Universidade Federal De Minas Gerais—UFMG, Belo Horizonte (BR)
Filed on Nov. 28, 2022, as Appl. No. 17/994,686.
Claims priority of application No. 10 2021 023979 4 (BR), filed on Nov. 27, 2021.
Prior Publication US 2023/0166215 A1, Jun. 1, 2023
Int. Cl. B01D 61/02 (2006.01); B01D 67/00 (2006.01); B01D 71/56 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01); C02F 1/26 (2023.01); C02F 103/08 (2006.01)
CPC B01D 61/026 (2022.08) [B01D 67/0002 (2013.01); B01D 67/00931 (2022.08); B01D 71/56 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C02F 1/265 (2013.01); B01D 2323/21819 (2022.08); C02F 2103/08 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A process for obtaining polyamide membrane with nanostructured coating, the process comprising the following steps:
(a) prepare dispersion of graphene oxide (GO) in absolute ethyl alcohol (99.5%) between 0.1 g/L and 2 g/L;
(b) apply the dispersion obtained in step (a) on reverse osmosis membranes made of a selective polyamide (PA) layer, using spin coating technique, with low rotation stage followed by high rotation;
(c) repeat step (b) between 1 and 5 times; and
(d) immerse the membranes in water immediately after step (c).