A natural clinoptilolite zeolite was transformed into other zeolites of greater industrial interest, such as zeolites with GIS and LTA structures. The synthesis conditions were studied, and the interzeolitic transformation was characterized by X-ray diffraction (XRD), X-ray fluorescence (FRX), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). From the results, it was possible to observe that the GIS and LTA zeolites were successfully synthesized. Furthermore, the results revealed that a synthesis time of 4 days was enough to obtain the GIS structure, and 4 h was sufficient to obtain LTA. The interzeolitic transformation can be explained by the RBU (Ring Building Unit) approach using C4 units from the HEU topology. The use of clinoptilolite in the synthesis of other zeolites is an innovative, economically viable, and environmentally sustainable process that exploits a material that exists in large quantities and is still little explored by industry.
Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. 2019 Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. www.atenaeditora.com.br APRESENTAÇÃO Caro leitor(a) A engenharia, em um aspecto etimológico é derivada do latim ingenium , cujo significado é "inteligência" e ingeniare , que significa "inventar, conceber". A inteligência de conceber define o engenheiro. Fácil perceber que aqueles cujo oficio está associado a inteligência de conceber, dependem umbilicalmente da tecnologia. Mostrar parte desta ligação é o principal proposito desta obra. Nela reunimos várias contribuições de trabalhos, ligados sobretudo a indústria petroquímica com potencial de impacto nas engenharias. São apresentados vários trabalhos de cunho tecnológico associados a temas como Biodiesel, Offshore, técnicas e ensaios associados a manutenção e segurança, processos químicos, entre outras temáticas. Todos com resultados e discussões enriquecedoras. Aos autores dos diversos trabalhos que compõe esta obra, expressamos o nosso agradecimento pela submissão de suas pesquisas junto a Editora Atena. Aos leitores, desejamos que esta obra possa colaborar com suas carreiras e gerar uma reflexão mais aprofundada sobre a relação entre a tecnologia e a engenharia.
Heavy metals are often released into aquatic environments through various sources of industrial processes. However, conventional treatment technologies demand high cost and/or are inefficient for the recovery of these resources. In this context, the technical application of adsorption has been highlighted by its simplicity and practicality, especially when zeolites are used as adsorbents due to their excellent physicalchemical and textural properties, among them: their high availability, high selectivity and low cost. The present work characterized and evaluated the performance of Na-ZSM-5, Na-ZSM-12, NH4-ZSM-5 and NH4-ZSM-12 zeolites on barium adsorption as an alternative for the treatment of produced water. The Na-ZSM-5 and Na-ZSM-12 zeolites were synthesized by the hydrothermal method and subjected to ion exchange to obtain the ammoniacal form (NH4-ZSM-5 and NH4-ZSM-12). The characterization was done by: DRX, SEM, FRX and Adsorption / Desorption of Nitrogen, and barium concentration was measured by Atomic Absorption Spectroscopy (AAS). The adsorption studies were conducted under agitation at the times of 1, 6, 12 and 24 h. The results were promising for this application, because the Na-ZSM-5 zeolite presented the highest adsorption capacity, a fact related to its textural properties (volume and area of micropores).
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