Jérémie Garnier

• University of Brasília

This work deals with the preparation of Pt/AC catalysts (Pt supported on activated carbon) and their use in the synthesis of hydrocarbon biofuels through the HEFA (hydroprocessing of esters and fatty acids) route. The key motivation for the work was that the catalysts based on sulfided Mo deposited on γ-Al2O3, traditionally employed in the hydropro...

Citation: de Freitas Júnior, A.M.; Brandão, R.D.; Garnier, J.; Tonhá, M.S.; Mussel, W.d.N.; Ballesteros-Plata, D.; Rodríguez-Castellón, E.; Prauchner, M.J. Activated Carbons as Supports for Sulfided Mo-Based Catalysts Intended for the Hydroprocessing of Lipidic Feedstocks. Catalysts 2025, 15, 359. https://doi. Abstract: The production of hydrocarbo...

Tropical karst landscapes are marked by complex sediment dynamics resulting from the interplay between geomorphic processes and sediment transport. In the Vermelho Watershed (Brazilian savanna), we use paired cosmogenic nuclides (10Be and 26Al) to quantify denudation rates, burial durations, and sediment mixing. The spatial distribution of Al–Be ra...

The production of hydrocarbon-based biofuels has been the target of intense research worldwide. In this context, the core goal of the present work was to investigate the use of mesopore-rich activated carbons (ACs) as support for sulfided Mo-based catalysts intended for the hydroprocessing of lipidic feedstocks. Key issues of the work were that: un...

The knowledge of metals concentration in upwelling areas are a concern due the higher productivity of these areas In Cabo Frio Upwelling-Downwelling System (CFUS) is high primary productivity area and has been identified as an Hg hotspot to biota in SE Brazil that has been susceptible to Hg inputs, due to growing industrialization in the region. To...

The treatment of 1-butyl-3-methylimidazolium chloride (BMImCl) has been studied under different anodes (Ti-Pt-SnO2-Sb2O5, MMO, and boron-doped diamond, BBD) and configurations (single-flow and dual-flow cell‒SFC and DFC, respectively) using MMO and BBD alone or combined. In terms of BMImCl removal and mineralization, BDD overperforms MMO in SFC con...

The quality of aquatic ecosystems can be significantly impacted by the input of nutrients and trace elements. Identifying the sources and bioavailability of these components is crucial for understanding their cycling and assessing the environmental effects in lakes subjected to increased anthropogenic pressure, such as Lake Paranoá, a man-made rese...

In the western Andes, climate changes have led to drastic ecological changes during the Pleistocene and Holocene. Given the debate surrounding precipitation pattern changes and the lack of research on lakes in the Chilean Altiplano, this study aims to assess recent climate changes. The paper presents an innovative methodology based on Google Earth...

Marinas are central hubs of global maritime leisure and transport, yet their operations can deteriorate the environmental quality of sediments. In response, this study investigated the metal contamination history associated with antifouling paint uses in a sediment core collected from Bracuhy marina (Southeast Brazil). Analysis target major and tra...

Artisanal small-scale gold mining (ASGM), an increasingly prevalent activity in South America, generates mercury-contaminated tailings that are often disposed of in the environment, leading to the introduction of mercury into ecosystems and the food web, where it bioaccumulates. Therefore, studying the geochemical processes involved in the desorpti...

The improvement of water management requires monitoring techniques that accurately evaluate water quality status and detect the effects of land use changes on water chemistry. This study aimed to evaluate how multivariate statistical methods and water quality indices can be applied together to evaluate the processes controlling water chemical compo...

RESUMO. O rio Melchior é o principal afluente do Rio Descoberto e tem problemas recorrentes de contaminação e alteração com poucos estudos visando indicadores geoquímicos de contaminação. Ele pode ser considerado um corpo hídrico fortemente afetado por atividades vinculadas à urbanização, uma vez que nesta região não há indústrias, mineração ou out...

Between 2013 and 2017, we carried out nine field missions in the Lago Grande de Curuai floodplain, located in Pará state – North of Brazil – to collect samples for monitoring surface water quality. This site separated from the river by a narrow bank is composed of a network of channels and shallow lakes, a morphology shared by the floodplains of th...

The Tocantins–Araguaia Basin covers an extensive area of Brazilian territory and has a water reservoir system installed in a cascade that is very important for water storage and hydropower production. There is concern about the use of this resource because of the current tendency of surface water reduction in the reservoir systems. Sustainable mana...

An old electroplating plant in Sepetiba Bay discharged metal-enriched wastes into the surrounding mangroves for 30 years (from the 1960s to 1990s), resulting in a hotspot zone of legacy sediments highly concentrated in toxic trace metals. This study applies Cu and Pb isotope systems to investigate the contributions of past punctual sources relative...

In 2019, the Brumadinho dam rupture released a massive amount of iron ore mining tailings into the Paraopeba River. Up to now, it remains a public health issue for the local and downstream populations. The present study aims to assess the behavior and fate of metal contamination following the disaster. Using new sampling strategies and up-to-date g...

The improvement of water management requires monitoring techniques that accurately evaluate water quality status and detect the effects of land use changes on water chemistry. This study aimed to evaluate how multivariate statistical methods and water quality indices can be applied together to evaluate the processes controlling water chemical compo...

The current development model of the agricultural sector in Brazil has considerable potential to cause negative environmental impacts, including the pollution of aquatic ecosystems, as it may contribute to the intensification of erosive processes on deforested soils, to the leaching of eroded materials, and to the consequent siltation of waterbodie...

Water is an essential compound on earth and necessary for life. The presence of highly toxic contaminants such as arsenic and others, in many cases, represents one of the biggest problems facing the earth´s population. Treatment of contaminated water with magnetite (Fe3O4) nanoparticles (NPs) can play a crucial role in arsenic removal. In this repo...

The present study investigated metal and metalloid dynamics in the estuarine water of the Doce River (Brazil) after the collapse of an iron ore-processing tailing dam in 2015. Spectroscopic and isotopic techniques were applied to bring new insights into the effects of the dam failure on the dynamics and hazardousness of particulate and dissolved me...

Sedimentary processes in coastal environments play a key role in the spatial dispersion of metal contaminants, including Zn. Combining Zn stable isotope signatures (δ66Zn) with traditional proxies of sedimentary sources and dispersal and post-depositional processes is a promising approach to understanding Zn anthropogenic dynamics in coastal system...

Mercury (Hg) is a toxic globally spread pollutant that has been found at increasing concentrations in the South Atlantic Ocean. The present work provides the first insight into the total mercury (HgT, unfiltered waters) content in the water of the Brazilian Exclusive Economic Zone (BEEZ), within a 24◦ S to 20◦ S. Water samples were collected from s...

This paper reports the first conceptual model of non-magmatic system in central Brazil, constrained by structural, hydrochemical and isotopic data. The study involved analyses of carbon, oxygen and hydrogen isotopes (14C,18O, 2H and ³H) in addition to the chemical signatures of water samples from natural springs and borehole. Samples were classifie...

Les émissions de mercure provenant de l'extraction de l'or ont suscité de plus en plus d'inquiétude au cours des deux dernières décennies, en raison de trois aspects majeurs de son cycle biogéochimique : sa permanence dans l'environnement, son transport atmosphérique sur de très longues distances et sa capacité de bio-accumulation et de bio-amplifi...

Sepetiba Bay has a wealth of fish species (total 148) as well as a vast area of mangroves and numerous rocky islands, which are important sites of reproduction for marine life. This peculiar environment of the Brazilian coast hosts one of the most important industrial centres of south-eastern Brazil. This site has been impacted for decades by the r...

Metal isotopes are versatile pollutant source trackers, but biogeochemical processes can overprint or alter the original source isotopic fingerprint and thus hinder contamination tracing. Here, we explore Fe isotope systematics for the complete range of natural and metallurgical processes related to Ni lateritic ores from Barro Alto, Brazil, to ass...

p>Entre fevereiro de 2018 e janeiro de 2020, foi realizado o monitoramento hidrológico e de qualidade da água do Córrego Vicente Pires, localizado em uma zona urbana do Distrito Federal, a fim de avaliar as alterações na qualidade da água a partir da determinação de parâmetros físico-químicos, em eventos nos períodos seco e chuvoso. Foram elaborado...

Central Brazil hydroclimate is in the core region of the South American monsoon system. Thus, understanding precipitation variability in this area is crucial not only for the prediction of extreme events such as droughts and floods, but also for water resources management. Ocean teleconnections influence central Brazil precipitation from intraseaso...

Isotope tracer Sequential extraction Anthropogenic activity a b s t r a c t The Paraiba do Sul (PSR) and Guandu Rivers (GR) water diversion system (120 km long) is located in the main industrial pole of Brazil and supplies drinking water for 9.4 million people in the metropolitan region of Rio de Janeiro. This study aims to discern the trace metals...

The study presents three sedimentary profiles from Tarimba cave in central Brazil. The data allow constraining the late Quaternary sedimentary evolution of cave systems in the region. A multi-techniques approach was used to characterize sediment texture (grain size and circularity index), mineralogical composition (X-Ray Diffraction), chemical comp...

Ultramafic (UM) rocks are defined as igneous rocks that contain more than 90% of mafic minerals. Soils derived from ultramafic rock are generally nutrient-deficient and have concomitant high concentrations of potentially phytotoxic trace elements (Ni, Cr, Co, Mn). Consequently, to assess the dynamics of nutrients and metals in the ultramafic complex o...

ABSTRACT Zinc isotope ratios provide qualitative and quantitative information about contributions from different Zn sources in the environment. Here, results of a preliminary study to identify the main sources controlling Zn isotope signatures are presented for sediments from Lake Paranoá (Brazil), an urban water reservoir. The Zn isotope ratios we...

This work studies the potential release of Cr from solids to surface water and groundwater, and the related isotopic compositions, in a nickel laterite ore deposit from Barro Alto in Brazil (in the State of Goiás). This ultramafic system is characterized by elevated concentrations of chromium (Cr). Even largely immobile Cr may be naturally leached...

Lacustrine sediments in a poorly documented region regarding to lake sedimentation and paleo-environments (Bangladesh) were investigated using a multiproxy approach. Pukurpara Lake is located in eastern Bangladesh at an elevation of 360 m above sea level with a maximum water depth of 28 m. An age-depth model allowed us to investigate the changes in...

The contamination of coastal environments by metallurgical wastes involves multiple biogeochemical processes; accordingly, understanding metal behavior and risk evaluation of contaminated areas, such as Sepetiba Bay (Rio de Janeiro, Brazil), remains challenging. This study coupled Zn isotopic analyses with sequential extractions (BCR) to investigat...

The Goiás Tin Province (GTP) in Brazil has great potential for rare earth elements (REE) deposits associated with A-type granites, such as the Pedra Branca Massif, which contains several Sn deposits and REE anomalies, hosted in its cupola and fracture greisens. The Faixa Placha is the most important tin deposit in the Pedra Branca Massif and has hi...

O lago Poópo é o segundo maior lago da Bolívia e atualmente vem passando por uma forte crise hídrica que alguns autores associam diretamente a mudança de ocupação da terra. Neste trabalho foi realizada a classificação do uso e ocupação do solo na sub-bacia P6 do lago entre os anos de 1985 e 2017. Foi analisado o desempenho dos classificadores SVM (...

Canadian Water Quality Index (CWQI) provides protection for freshwater life promoting healthy ecosystems and safeguarding human health. Biological Diatom Index (BDI) was developed to indicate the ecological status and water quality of freshwater systems. This paper evaluates the relations between the two different indices. During rising and falling...

Flooding dynamics across a medium‐size (Janauacá Lake, 786 km2) floodplain system along the Amazon/Solimões River over a 9‐years period (2006–2015) is studied through integration of remote sensing and limited in situ data in hydrologic‐hydrodynamic modelling based on Telemac‐2D model. We firstly detail the methodological approach and the modelling...

To evaluate the total mercury accumulation (THg) in the Descoberto river basin environmental protection area (DREPA), nine sediment and water samples were collected from the Descoberto reservoir (lentic environment), and 23 in its tributaries (lotic environment), which are located in a densely urbanized area within the Descoberto river watershed, B...

During the last decades, agriculture has drastically increased over the South American Andean Plateau (Altiplano), resulting in extensive changes in land cover from native vegetation to essentially Quinoa crop. Along with climatic variability, these land use changes appear as a catalyst in worsening the already existing drought events and water sca...

Many trophic indices have been constructed for temperate aquatic environments, but few have proved reliable for tropical environments. Indices constructed on the basis of nutrients may not be effective for describing the trophic state because the fractions of nitrogen and phosphorus differ in their potential to predict the nutrient limitation in tr...

This study provides additional information about mercury sources and their distribution in the Amazônia regolith using a large dataset of samples collected from distinct geology, mineralogy, and tropical weathering effects. Furthermore, the Hg distribution allowed discussing the superficial dynamics and controversial question on the Hg natural or a...

Amazonian aquatic environments are complex, and their interaction promotes heterogeneous environments that in turn make it difficult to describe the development of patterns. Amazonian floodplain lakes have different environmental and biological responses in similar water periods due to the interannual variation. We evaluated if the interannual vari...

The Mocambo Granitic Massif is an A-type granite located in the northeastern part of Goiás State, near the city of Monte Alegre de Goiás. It belongs to the Pedra Branca Suite, which is itself part of the Goiás Tin Province, a group of stanniferous granites that exhibit similar geochemical features, including to a greater or lesser degree of rare ea...

This study assessed the influence of hydrodynamic conditions on the degradation process of 1-butyl-3-methylimidazolium chloride (BMImCl) solution on a boron-doped diamond anode in a filter-type electrochemical reactor configuration. The results show that this parameter did not significantly affect this process when operating in the laminar regime....

The processes in tropical floodplain lakes enable maintaining phytoplankton nutrient requirements over a hydrological year. The nutrients such as nitrogen, phosphorus and carbon compounds play an essential role in phytoplankton growth. However, the way that nutrients and phytoplankton interact and how this relationship varies seasonally in tropical...

RESUMO-A condutividade elétrica da água pode indicar a presença de diversos poluentes nas águas de drenagem pluvial, como por exemplo, compostos de nitrogênio (amônia, nitrito e nitrato), fósforo (fosfato) e cloro (cloreto). Portanto, estabelecer um conhecimento mais aprofundado sobre as relações que envolvem condutividade e qualidade das águas pod...

The laterite Ni ore smelting operations in Niquelândia and Barro Alto (Goiás State, Brazil) have produced large amounts of fine-grained smelting wastes, which have been stockpiled on dumps and in settling ponds. We investigated granulated slag dusts (n = 5) and fly ash samples (n = 4) with a special focus on their leaching behaviour in deionised wa...

Ultramafic derived soils are characterized by low nutrient soils, a low Ca:Mg ratio, and high metal contents such as Ni, Co and Cr. The vegetation growing on these soils is highly adapted and includes both Ni hyperaccumulator and accumulator species. Today, approximately 530 Ni hyperaccumulator species are listed worldwide and the Ni concentration...

This work aimed to contribute in the sedimentometric study of the Riacho Fundo stream, affluent of Lake Paranoá, Brasília, Federal District, and historically the main sediments exporter for the entire basin. For this purpose, the flow was measured by the acoustic method with the Sontek River Surveyour M9 equipment and an automatic sampler ISCO 6712...

Recent work has shown that variations in zinc (Zn) isotope ratios enable us to identify contamination sources in the terrestrial environment and uptake processes in higher plants. Here in this study, we demonstrate that this also holds true for mangrove forests, which play an important role in the biogeochemical cycling of metals in tropical coasta...

The source assessments of metal contaminants are critical for a consistent management of coastal zones. In this work, lead (Pb) concentration and isotopic composition were determined in sediments from Angra dos Reis coast (Brazil) to evaluate the potential influence of contamination sources on Pb distribution. Estimated Pb enrichment factor superio...

Ultramafic (UM) rocks are known to be nickel (Ni) rich and to weather quickly, which makes them a good candidate to look at the Ni isotope systematics during weathering processes at the Earth’s surface. The present study aims at identifying the Ni solid speciation and discussing the weathering processes that produce Ni isotope fractionation in two...

The labile pool of chromium (Cr), ECr value for soils and EwCr value for suspended particulate matter (SPM) in water, can be efficiently assessed in different environmental compartments through the use of isotopic dilution techniques. The overall objective of this work was to evaluate Cr availability based on the suspended particle matter size rang...

Climatic changes and their socio-environmental impacts are an issue of constant debate. Instrumental data collected over the last 150 years show a positive linear trend in global temperature, where the last decade was the warmest one. This observed increase in the mean global temperature impacts in the atmospheric and oceanic circulation, and it ha...

The Sepetiba Bay, Southeastern Brazil, has undergone intense environmental changes due to anthropogenic influence. This work aims to: (i) evaluate the changes in the drainage landscape use over the last decades, (ii) identify new and past punctual and diffuse anthropogenic sources and assess risks of man-induced disturbances of the coastal zones of...

In the world richest biotope, wetlands, and specially floodplains, remain particularly active zones in terms of nutrients, biodiversity, flows spreading, sediment transfer and human activities. Today, these sensitive zones are facing increasing human pressures and augmentation in frequency and intensity of extreme events. The impact of such extreme...

In the world’s richest biotope, wetlands, and especially floodplains, remain particularly active zones in terms of nutrients, biodiversity, flows spreading, sediment transfer, and human activities. Today, these sensitive zones are facing increasing human pressures and augmentation in frequency and intensity of extreme hydrological events. The impac...

Muito se discute sobre as atuais mudanças do clima e seus impactos socioambientais. Dados instrumentais dos últimos 150 anos mostram uma tendência de aumento de temperatura global que pode gerar impactos no balanço hídrico global. Contudo, pouco se conhece sobre os impactos regionais dessas mudanças globais. A isso se deve a baixa densidade de regi...

Ultramafic rocks may display high chromium (Cr) concentrations, which could be naturally leached to surface and groundwater. However, mining and metallurgical activities may considerably increase the amount of both Cr(III) and Cr(VI) released into the environment, the later being highly soluble in water, bioavailable and toxic. In the present study...

The new IMERG and GSMaP-v6 satellite rainfall estimation (SRE) products from the GPM mission have been available since January 2015. With a finer spatial resolution of 0.1°, these products should provide more accurate information than their latest widely adapted (relatively coarser spatial scale, 0.25°) counterpart (TMPA product). The present study...

The application of zinc (Zn) isotopes in bivalve tissues to identify zinc sources in estuaries was critically assessed. We determined the zinc isotope composition of mollusks (Crassostrea brasiliana and Perna perna) and suspended particulate matter (SPM) in a tropical estuary (Sepetiba Bay, Brazil) historically impacted by metallurgical activities....

In May 2016, a new Digital Elevation Model (DEM) called ALOS-DEM was made available by the Japan Aerospace Exploration Agency (JAXA). With a resolution of 30 m the ALOS-DEM bring valuable information over remote regions. The ALOS-DEM is assessed for the first time and over the South American Andean Plateau considering both vertical and relative acc...

The new IMERG and GSMaP-v6 satellite rainfall estimation (SRE) products from the Global Precipitation Monitoring (GPM) mission have been available since January 2015. With a finer grid box of 0.1°, these products should provide more detailed information than their latest widely-adapted (relatively coarser spatial scale, 0.25°) counterpart. Integrat...

In 2015, an emergency state was declared in Bolivia when Poopó Lake dried up. Climate variability and the increasing need for water are potential factors responsible for this situation. Because field data are missing over the region, no statements are possible about the influence of mentioned factors. This study is a preliminary step toward the und...

In the Amazon Basin, floodplains form a complex mosaic of freshwater systems with differing morphologies, resulting in varied inundation patterns and heterogeneous chemical and ecological characteristics. In this study, we focused on the Janauacá floodplain, a medium-sized system (786 km2, including the local watershed) located along the Solimões R...

Previously available only over the Continental United States (CONUS), the 1 arc-second mesh size (spatial resolution) SRTM-GL1 (Shuttle Radar Topographic Mission – Global 1) product has been freely available worldwide since November 2014. With a relatively small mesh size, this digital elevation model (DEM) provides valuable topographic information...

Nickel isotope ratios were measured in ores, fly ash, slags and FeNi samples from two metallurgical plants located in the Goiás State, Brazil (Barro Alto, Niquelândia). This allowed investigating the mass-dependent fractionation of Ni isotopes during the Ni-laterite ore smelting and refining. Feeding material exhibits a large range of δ60Ni values...

The large floodplains associated with the Amazon River and its main tributaries affect water transport, influence sediment and chemical budgets and support highly diverse ecosystems and productive fisheries. Approximately 25% of the Amazon River discharge is routed through these systems along a 2,000 km reach between Sao Paulo de Olivença and Óbido...

The large floodplains associated with the Amazon River and its main tributaries affect water transport, influence sediment and chemical budgets and support highly diverse ecosystems and productive fi sheries. Approximately 25% of the Amazon River discharge is routed through these systems along a 2,000 km reach between Sao Paulo de Olivença and 6bid...

Previamente avaliado sobre os Estados Unidos Continentais (CONUS), os Modelo Digital de Elevação (DEM) SRTM-GL1 foi recentemente disponibilizado em âmbito mundial gratuitamente. Com uma alta resolução espacial, esse modelo fornece informações de valores topográficos também em regiões remotas. SRTM-GL1 foi utilizado para estudo em termos de exatidão...

The laterite nickel (Ni) ore smelting operation in Niquelândia (Goiás state, Brazil) produced large amounts of smelting wastes, stockpiled on dumps (slags) and in settling ponds (fly ash). In this study we present data on the chemistry, mineralogy and pH-dependent leaching behaviours of these two waste materials.

Soils and ore samples influenced by mining and metallurgical activity were collected in ultramafic soils (UM) complexes of Barro Alto and Niquelandia, in order to determine the contribution of each Ni bearing phases to the total exchangeable pool of Ni, and to point out if this pool was affected by anthropic activities. For this purpose, the IEK-mo...

Arsenic concentration in the pore water of paddy fields (Csoln) irrigated with arsenic-rich groundwater is a key parameter in arsenic uptake by rice. Pore water extracts from cores and in situ deployment of DET and DGT probes were used to measure the arsenic concentration in the pore water. Ferrihydrite (Fe) and titanium dioxide (Ti) were used as D...

Nine satellite rainfall estimations (SREs) were evaluated for the first time over the South American Andean plateau watershed by comparison with rain gauge data acquired between 2005 and 2007. The comparisons were carried out at the annual, monthly and daily time steps. All SREs reproduce the salient pattern of the annual rain field, with a marked...