Toxic metals removal by new membranes based on graphene oxide and a cationic Polymer: Influence of chemical and morphological aspects

Autor(es)

Neves, Tauany de Figueiredo ; Lopes, Claudia Batista ; Mastelaro, Valmor Roberto ; Dantasa, Renato Falcao ; Silva, Carlos Manuel ; Predigera, Patricia

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL ENGINEERING JOURNAL; v. 498, p. 14-pg., 2024-09-13.

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. (AU)

• Processo FAPESP: 19/25228-0 - Desenvolvimento de novas membranas baseadas em óxido de grafeno para a remoção de contaminantes em água
• Beneficiário: Tauany de Figueiredo Neves
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 22/11525-6 - Preparação de novas membranas de poliacrilonitrila baseadas em polivinil piridínio/óxido de grafeno para remoção de poluentes em água e efluentes
• Beneficiário: Tauany de Figueiredo Neves
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 22/14834-0 - Síntese de novos nanoadsorventes através de protocolos verdes e suas aplicações na remoção de poluentes em águas
• Beneficiário: Patricia Prediger
• Modalidade de apoio: Auxílio à Pesquisa - Regular