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

Author(s)

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

• Document type: Journal article
• Source: CHEMICAL ENGINEERING JOURNAL; v. 498, p. 14-pg., 2024-09-13.

Abstract

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)

• FAPESP's process: 19/25228-0 - Development of new membranes based on graphene oxide for the removal of contaminants in water
• Grantee: Tauany de Figueiredo Neves
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 22/11525-6 - Preparation of new polyacrylonitrile membranes based on polyvinyl pyridinium/graphene oxide for removal of pollutants in water and effluents
• Grantee: Tauany de Figueiredo Neves
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 22/14834-0 - Synthesis of new nanoadsorbents, their characterizations and applications in pollutant adsorption in water
• Grantee: Patricia Prediger
• Support Opportunities: Regular Research Grants