Cartuchos de carbonos porosos obtidos a partir da amêndoa da manga Tommy atkins e do caroço do abacate Persea americana aplicados como adsorventes de íons Cd²⁺, Cu²⁺ e Pb²⁺

• Ano de defesa: 2022
• Autor(a) principal: Azevedo, Ingrid Aragão Lima
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Carbonos porosos; Adsorção; Íons metálicos; Manga Tommy atkins; Abacate Persea americana
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/68396

The high concentration of heavy metals in water bodies is dangerous for the environment, as it is intensely toxic to organisms, making its removal of great importance. Several techniques for removing heavy metal cations from the environment have been developed in order to reduce contamination of effluents, among them, adsorption appears as a great option due to its low cost, for example. For this, solid adsorbent materials with high adsorption capacity are used. Recently, materials based on porous carbons have been used as bioadsorbents in this technique, because compared to conventional adsorbents, such as silicas, these materials have a high surface area, high adsorption capacity, in addition to the possibility of being obtained from by-products of agribusiness. In this context, the objective of this work is to develop cartridges based on porous carbons using different carbon sources for the adsorption of metallic ions in an aqueous medium. The methodology is based on lyophilization, followed by carbonization of two materials of vegetable origin obtained form the Tommy atkins mango kernel and the Persea americana avocado seed, which were subjected to oxidation procedure. The characterization of the cartridges took place throug the techniques of spectroscopy in the infrared region, which allowed to prove that the two carbon sources, despite different origins, have similar composition. Scanning electron microscopy for both samples confirmed the presence of defined and organized porous structures. And the thermogravimetric tests allowed to identify the similar resistance between the lyophilized samples and the carbonized and oxidized samples of both samples. Furthermore, the adsorptive potential of both was evaluated through the batch adsorption of the metallic ions Cu2+, Cd2+ and Pb2+. The results indicate the success in the preparation of porous carbons with homogeneous pore size distribution, high termal stability and with promising adsorption values for the materials studied. Thus, the results obtained demonstrate the practical feasibility for the adsorption of toxic metals.