According to the Intergovernmental Panel on Climate Change of 2021, climate changes caused by human activity are leading to more frequent and extreme weather events. These climate changes have been attributed mainly to an increase in the emissions of CO2. In this context, it is very important to find new materials for the capture and storage of CO2. These materials should perform gas separations, such as CO2/N2 in the exhaust of thermoelectric stations and should therefore display high selectivity and permeability for gas separation. One technology that has been considered for this purpose is the use of mixed matrix membranes (MMM), which consist of a polymeric matrix impregnated with an inorganic filler, such as metal-organic frameworks (MOF). MOF are porous crystalline solids formed by nodes, which are metal cations, interconnected by bifunctional organic ligands. In the present work, we synthesized MOF for MMM, using 1,4,5,8-naphthalenediimides (NDI) as the organic ligands. In 2008, the group of J. Hupp reported for the first time that a NDI-based MOF was efficient in the separation of CO2 from CH4. For that purpose, they employed DPNI, a NDI derivative substituted with basic pyridine ligands, and zinc as the cation. Herein, we present a novel NDI ligand, CNDI, containing acidic carboxylic ligands. CNDI was synthesized by the reaction of 1,4,5,8-naphthalic dianhydride with 4-aminobenzoic acid, using molten imidazole as the solvent. Two types of MOFs were prepared using CNDI as the ligand, namely an IRMOF, employing Zn as the cation, and an UiO-type MOF, employing Zr as the cation. MOF syntheses were performed in an autoclave, using dimethylformamide as the solvent. The MOF were characterized by X-ray diffraction, scanning electron microscopy and N2 adsorption isotherms. The CNDI-based UiO MOF showed higher crystallinity, also presented mesoporosity, leading to the conclusion it can be a candidate to be used in the synthesis of MMM.
Bem-vindo(a) aos Anais do VII NanoMat, evento organizado pela Pós-graduação em Nanociências e Materiais Avançados da Universidade Federal do ABC (UFABC) com o intuito de reunir e debater trabalhos desenvolvidos por alunos e pós-doutorandos em Materiais e áreas afins.
Comissão Organizadora
Pedro Alves da Silva Autreto
Andre Luiz Martins de Freitas
Aryane Tofanello
Comissão Científica
Ferramenta completa de submissão, avaliação e publicação de anais para eventos científicos.
