Doutorado em Química
URI Permanente para esta coleção
Nível: início
Ano de início: 2014
Conceito atual na CAPES: 5
Ato normativo: Homologação da 85ª Reunião do CTC-ES, Parecer CNE/CES nº 163/2005.
Processo nº 23001.000081/2005-56 do Ministério da Educação.
Publicado no DOU 28/07/2005, seção 1, página 11)
Periodicidade de seleção: Anual
Área(s) de concentração: Química
Url do curso: https://quimica.vitoria.ufes.br/pt-br/pos-graduacao/PPGQ/detalhes-do-curso?id=956/a>
Navegar
Navegando Doutorado em Química por Autor "Athayde, Geisamanda Pedrini Brandão"
Agora exibindo 1 - 3 de 3
Resultados por página
Opções de Ordenação
- ItemAvaliação da qualidade de águas superficiais: uma abordagem local com proposta de mitigação por adsorção em fase sólida(Universidade Federal do Espírito Santo, 2024-12-17) Rocha, Ana Kelly Simões; Costa, Vinicius Câmara; Lima, Maria Tereza Weitzel Dias Carneiro de; https://orcid.org/0000-0002-8731-5093; Rosa, Thalles Ramon; Costa, Eline Nayara Dantas da; Costa, José Arnaldo Santana; Athayde, Geisamanda Pedrini BrandãoThe assessment of surface water quality through continuous monitoring has received increased attention in recent years due to the increasing degradation of aquatic environments. This monitoring is essential to support Contaminated Area Management (CAM) studies, which include important steps such as the preliminary and detailed assessment of aquatic environments. The deltaic region of the Doce River, a floodplain highly vulnerable to contamination, is affected by mining, agricultural and industrial activities, and possibly by the effects of the Fundão dam collapse in 2015. Thus, the city of Degredo, which belongs to the deltaic region, was addressed in a specific case study, which identified high concentrations of Al, Ba, B, Co, Fe, P, Mn, Ni and Zn in the waters of points P1 and P3, above the CONAMA 357/2005 and IRMA legislation, constituting Potentially Toxic Elements (PTEs). A simulated Human Health Risk Assessment (HHRA) at this site ranged from "insignificant" to "low", with water ingestion as the main route of exposure. In addition, analyses showed that contamination levels increased after the dam breach (IPTTh between 0.40 and 23.73), contrary to the expected trend. The adsorption process was used as an alternative for the remediation of water contaminated by EPTs, using the CA-CaCO3 adsorbent, synthesised by dispersing CaCO3 on a porous carbon support derived from biomass. This material contained 12 wt% of nanocrystalline CaCO3 particles. The adsorbent and pure CA showed high efficiency, removing 99.9% of Fe2+, Mn2+, Cd2+, Ni2+, Zn2+ and Pb2+ ions in 20 min under optimised conditions (pH = 6.00 and adsorbent mass = 100 mg). Structural and chemical analyses (XRD, TG, SEM-EDX, mapping and ICP-OES) of CA and CA-CaCO3 helped to understand the structural and chemical characteristics of these materials, while kinetic and isothermal analyses showed that the process occurs by chemisorption. Thus, this work is linked to concepts of risk management, sustainability and circular economy, and provides an efficient and cost-effective alternative for the remediation of water contaminated by EPTs.
- ItemCaracterização dos sistemas praiais adjacentes à foz do Rio Doce (Espírito Santo, Brasil) quanto aos teores de elementos químicos em sedimentos e material particulado em suspensão(Universidade Federal do Espírito Santo, 2022-09-23) Krause, Maiara; Lima, Maria Tereza Weitzel Dias Carneiro; http://lattes.cnpq.br/9989703911201351; https://orcid.org/0000-0002-9051-0308; http://lattes.cnpq.br/1606790785332278; Souza, Jefferson Rodrigues de; https://orcid.org/0000-0002-3347-8735; http://lattes.cnpq.br/2386398242050923; Athayde, Geisamanda Pedrini Brandão; https://orcid.org/0000-0002-4315-0653; http://lattes.cnpq.br/8037324704189596; Ribeiro, Juliano Souza; http://lattes.cnpq.br/6265921763953587; Sa, Fabian; https://orcid.org/0000000339645685; http://lattes.cnpq.br/9329106914297651The beaches on the north coast of Espírito Santo constantly receive pollutants from the Doce River, as a result of the intense occupation and the historic centenary of mining activities in the Doce River Basin. The objective of this study was to evaluate the elemental composition of the beaches adjacent to the mouth of the Doce River, as well as the processes that act in the distribution of these elements. In addition to evaluate the influence of the fluvial input of the Doce River and the possible impacts of the rupture of the Fundão dam in the study area. For this, the chemical elements Al, As, Ba, Co, Cr, Cu, Fe, Mn, Ni, Pb, V and Zn were determined in samples of suspended particulate matter (SPM) and surface sediments from the backshore and shoreface at stations adjacent to the mouth of the Doce River. The decomposition of the samples was performed by the U.S. EPA 3051A. Chemical elements were quantified by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP OES). The results showed that the beaches in the Foz and North sectors of the mouth of the Doce River presented fine sediments on the shoreface and high concentrations of the chemical elements evaluated. This result indicates that river sediments reach the mouth and follow a longitudinal distribution pattern, preferably from south to north. The different sediment quality index (Igeo and SGQ-q) also showed that these sectors have moderate potential to cause adverse effects to biota. In addition, the values of magnetic susceptibility and IMS (%) suggest that mining tailings, arising from the rupture of the Fundão dam, are present in the study area even after almost six years of its arrival on the coast of Espírito Santo.
- ItemElementos traço em água e sedimento na bacia hidrográfica do Rio Santa Maria da Vitória (ES)(Universidade Federal do Espírito Santo, 2018-06-27) Salles, Roberta Chechetto; Rodrigues Neto, Renato; Carneiro, Maria Tereza Weitzel Dias; Filgueiras, Paulo Roberto; Athayde, Geisamanda Pedrini Brandão; Sá, Fabian; Lima, Ana Teresa MacasThe population growth leads to an increase in activities related to urbanization and industrialization, which are responsible for increasing trace elements in water sources. These elements present significant toxicity, and may accumulate over decades in the environment, generating risks to human health and ecosystem. In this sense, it is necessary to quantify trace elements in order to evaluate the contamination of the environment and its effects. In this context, this work aims to quantify and evaluate the contamination by trace elements: Fe, Mn, Ni, As, Cd, Cu, Co andPbin samples of water, surface sediment and of the corein the watershed of the river Santa Maria da Vitória. The river basin Santa Maria da Vitória is located in the central region of the Espírito Santo occupying an area of 1.563,3 km2. It is born in the mountain region of the state and includes the municipalities of Santa Maria de Jetibá and Santa Leopoldina, and part of the municipalities of Cariacica, Serra, Vila Velha, Viana and Vitória. In its middle course it suffers two buses, of the reservoirs Rio Bonito and Suíça. Two campaigns were carried out in march and november 2016. In these campaigns, samples of water and surface sediment were collected from the Santa Maria da Vitória river (5 stations) and Rio Bonito (3 stations), Suíça(2 stations) and Duas Bocas (3 stations). In the reservoir, the water samples were collected on the surface and at different depths and in the second campaign, in addition to the water and surface sediment samples, a sediment sample was collected in each of these reservoir. The analytical methodology was evaluated for sensitivity and linearity, accuracy and limits of detection and quantification.The water samples were filtered, acidified and analyzed by ICP-MS for the Mn, Ni, As, Cd, Cu, Co, and Pb elements and by ICP OES for Fe. Sediment, surface and sample samples were digested in and analyzed by ICP-MS for the Ni, As, Cd, Cu, Co and Pb elements and by ICP OES for Fe and Mn. The results obtained for the Santa Mariada Vitória river show the great impact that the stream São Luiz has been suffering through the dumping of different types of tailings from different origins. The results for the water samples and surface sediment of the dams indicate the difference between the river, intermediate and lacustrine zones. By means of the concentration of the trace elements and the dating(Pb210)of the sediment samples from the Rio Bonito reservoir, Suíça and Duas Bocas, an association was made with the historical events occurring at each site.To better interpret the data, the enrichment factor and the PLI and IR pollution parameters were analyzed. In addition, the granulometry and mineralogy of the samples and Pearson's analysis were performed in order to assist in the discussion of the results. The distribution of the elements in the soil is governed by interactions between the elements themselves and the same with attributes such as clay and silt fractions and Fe and Mn oxides, in addition to interaction with organic matter.The studies also indicate that Rio Bonito is in an alert situation, due to the large amount of tailings that are retained in this reservoir, from the rural and industrial activities of Santa Maria Jetibá. The maintenanceof the Suíça reservoir caused a change in the sediment column, compromising the results of this study. Whilefor Duas Bocas, it is clear that the results are a reflection of deforestation and the use of land for agriculturewhich occurred decades ago.