resumo
Polymeric nanocomposite membranes are emerging as promising materials for water treatment. To explore the potential of new materials for the removal of toxic metals from water, novel hydrolyzed polyacrylonitrile (hPAN) membranes coated with graphene oxide (GO) by layer-by-layer (LbL) assembly, using poly(4-vinylpyridinium iodide) (PVPI) as binding agent, were prepared, characterized, and applied to remove toxic metals in multi- component systems. The addition of PVPI and GO to the hPAN membrane modified the surface roughness, hydrophilicity, layers morphology, and introduced oxygenated functions to the pristine polymer. These features enhanced the material's selectivity for Cu2+, Cr3+, and Pb2+, over Ni2+ and Cd2+, with removal efficiencies of 50.4 %, 64.3 %, and 99.9 % in batch assays, at the concentrations of 4.1, 12.2, and 10.2 mg L- 1 , and selectivities relative to Cd2+ of 13.7, 24.2 and 13450, respectively. Governed by the formation of coordination complexes, the increment of nanocomposite layers adhered to the polymer improved the adsorbent/adsorbate interactions. The efficiency of hPAN membrane with three PVPI/GO bilayers in removing metal ions was attested in comparison to other polymer nanocomposite membranes from literature.
palavras-chave
COMPOSITE MEMBRANES; WASTE-WATER; NANOFILTRATION; ADSORPTION; PERFORMANCE; FIBERS; IONS; DYES
categoria
Engineering
autores
Neves, TD; Lopes, CB; Mastelaro, VR; Dantasa, RF; Silva, CM; Predigera, P
nossos autores
Carlos Manuel Silva
Professor associado
Cláudia Batista Lopes
Investigador AuxiliarProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was supported by Brazilian National Research Council (CNPq, n. 311419/2022-4) , Coordination for the Improvement of Higher Education Personnel (CAPES) (Finance Code 001) , Fund for Support to Teaching, Research and Outreach Activities (FAEPEX, n. 2529/23 and 2207/23) , Foundation of the State of Sao Paulo (FAPESP, n. 2013/07296-2, 2019/25228-0, 2022/14834-0, and 2022/11525-6) , CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020) , UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) , National Nanotechnology Laboratory (LNNano-CNPEM, n. 20220862, 20220788 and 20230393) and Brazilian Biorenewables National Laboratory (LNBR-CNPEM, n. 20220636) .