Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.01401
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

AVALIAÇÃO DAS INTERAÇÕES DAS NANOPARTICULAS DE DIÓXIDO DE TITÂNIO EM SOLOS DE ATERRO CONTROLADO CONTAMINADOS POR ÓXIDO DE COBRE

INTERATION EVALUATION OF TITANIUM DIOXIDE NANOPARTICLES IN CONTROLLED LANDIFILLS SOILS CONTAMINATED WITH COPPER OXIDE

Elizabeth Mendes de Oliveira; José Adilson de Castro; Leonardo Martins da Silva; Fabiano Alves de Oliveira; Darlene Souza da Silva Almeida

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Resumo

Os materiais nanoparticulados representam uma nova classe de contaminantes produzidas pelo homem e estão cada vez mais presentes nos ambientes naturais proveniente da sua produção em larga escala e o seu crescimento acelerado nas diversas aplicações de engenharia. Diante dessa realidade, pesquisas estão sendo desenvolvidas, em particular, relativas aos fenômenos físicos e químicos que ocorrem em solos e águas quando submetidos à disposição destes resíduos. O objetivo deste trabalho é simular o processo de lixiviação de solos impregnados com nanoparticulas de óxido cobre, em suspensões aquosas de nanoparticulas de TiO2 , com o intuito de estudar tais fenômenos e associá-los ao transporte desses nanomateriais e ao seu impacto no meio ambiente, possibilitando desta forma, que a produção e o uso de nanomateriais nocivos possam ser melhor controlados, evitando possíveis efeitos adversos à saúde humana e os custosos processos de remediação. Foram simulados condições de contaminação e retenção em camadas de proteção de aterros sanitários controlados. Os resultados obtidos nos ensaios de coluna demonstraram que as suspensões das nanoparticulas de TiO2 (TiO2 -NPs) desempenharam o papel principal na estabilização das nanoparticulas de CuO (CuO-NPs) na suspensão desencadeando o carreamento dos diversos nanoparticulados no lixiviado diminuindo a eficiência de retenção das camadas de solos.

Palavras-chave

Suspensões; Nanoparticulas de TiO2 ; Nanoparticulas de CuO; Colunas de Solo; Nanosight

Abstract

Engineered nanoparticles represent a new class of man-made contaminants which are increasingly present in natural environments considering their large-scale production with accelerated growth in various engineering applications. This has driven several researches to study the interactions phenomena with the environment; in particular, the physical and chemical phenomena that occur in soils and waters exposed to waste disposal landfills. The general objective of this work is to simulate the leaching and interactions processes of impregnated soils with copper oxide nanoparticles in aqueous suspensions of TiO2 nanoparticles. Thus, in this study are addressed such phenomena and associate them with the transport of these nanomaterials and their impact on the environment. Column experiments were carried out in order to simulate the landfill layers used as protection barriers. These methodology helps to understand the impact of the production and controlled disposal of harmful nanomaterials, avoiding possible adverse effects on human health and costly remediation processes. The results obtained in the leaching column experiments demonstrated that the suspensions of TiO2 nanoparticles (TiO2-NPs) played the major role on the stabilization of the CuO nanoparticles (CuO-NPs) suspensions leading to diversified leaching nanoparticles to the suspensions, decreasing the efficiency of soil layers retention.

Keywords

Suspensions; Nanoparticles of TiO2 ; Nanoparticles of CuO; Landfills soil; Nanosight.

Referências

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