Journal
CHEMICAL ENGINEERING JOURNAL
Volume 413, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127510
Keywords
Desalination membrane; Multilayer graphene membrane; Subnanometric pores on graphene; Atom vacancies on graphene; Dopant removal on graphene
Categories
Funding
- Project NOR-WATER - INTERREG VA SpainPortugal cooperation programme, CrossBorder North Portugal/Galiza Spain Cooperation Program (POC-TEP)
- Associate Laboratory LSRELCM - national funds through FCT/MCTES (PIDDAC) [UIDB/50020/2020]
- FCT [SFRH/BD/138756/2018, CEECIND/01317/2017]
- Spanish Ministry of Science and Innovation (Severo Ochoa SEV2016)
- Spanish Ministry of Science and Innovation [RTI2018-890237-CO2-R1]
- Generalitat Valenciana [Prometeo 2017-83]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/138756/2018] Funding Source: FCT
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This research focuses on the preparation of a large area desalination membrane based on multilayers of B, N-codoped defective graphene, which showed high efficiency in NaCl and KCl removal from brackish water. The membrane also achieved a high permeate flux of 24.3 L m-2 h-1 at 10 bars.
This manuscript reports the preparation of a large area (84 cm2) desalination membrane based on multilayers (11 nm thickness) of B,N-codoped defective graphene. The process consists of coating a porous ceramic ?-Al2O3 support (100 nm pore size) with a continuous nanometric (50 nm) chitosan film containing adsorbed (NH4)3BO3. Subsequent pyrolysis in the presence of hydrogen converts chitosan into multilayer defective B,N-codoped graphene. The partial removal of B and N dopant atoms by H2 during the pyrolysis causes the generation of subnanometric pores due to atom vacancy, as determined by control experiments in the absence of this gas. A NaCl and KCl removal efficiency from brackish water higher than 95% for a permeate flux of 24.3 L m- 2 h-1 at 10 bars were achieved.
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