Adriano da Silva

Universidade Federal de Santa Catarina | UFSC · Departamento de Engenharia Química e Engenharia de Alimentos

A novel strontium-iron-based perovskite-type material (SrFeO3) has been successfully synthesized and characterized as a promising photocatalyst for degrading diclofenac sodium (DCF). The catalyst was synthesized using the sol–gel method, resulting in a material with distinctive features, including a dense structure and a uniform distribution of met...

In this work, N-alkylated tetrazole copolymers were prepared to produce the solid polymeric electrolytes StVTz-82, StVTz-82:4C, StVTz-82:6C, StVTz-82:8C and StVTz-82:sultone. The chemical structure was confirmed by FTIR, H NMR, C NMR and GPC. GPC thermal analysis showed that the membranes are thermally stable up to 160 °C. DSC was used to evaluate...

The increase in the world population and the intensification of agricultural practices have resulted in the release of several contaminants into the environment, especially pesticides and heavy metals. This article reviews recent advances in using adsorbent and catalytic materials for environmental decontamination. Different materials, including cl...

Composites of modified avocado seed with ammonium polyphosphate (APP)-functionalized poly(lactic acid) (PLA), in a PLA/ethylene–vinyl acetate copolymer (EVA) matrix, were prepared in an internal mixer and characterized. The results of flame retardancy tests show that the joint use of APP and modified avocado seeds in the polymer mixture can provide...

The alarming release of pollutants into aquatic ecosystems, particularly concerning the emission of antibiotics, demands attention. Tetracycline (TC) is a drug commonly identified in both industrial and residential wastewater. In this context, new perovskite-type catalysts are considered a relevant topic for antibiotic degradation in water. The foc...

Tetracycline (TC) is a drug commonly detected in wastewater. Given this, researchers have been working intensely to create efficient methods to eliminate TC from water. Therefore, the work aimed to synthesize a metal-free catalyst, graphitic carbon nitride (g-CN), to remove TC from water through photocatalysis. The one-step methodology via thermal...

Heterogeneous photocatalysis is an alternative to mineralizing emerging pollutants. The present study focuses on the kinetic model of salicylic acid photocatalytic degradation in an aqueous solution as a function of pollutant concentration and light intensity. The intrinsic kinetic model parameters were determined using a differential photocatalyti...

Society confronts the pressing environmental challenges posed by the pervasive presence of toxic pollutants in aquatic ecosystems. The repercussions of contaminant release extend far and wide, endangering marine life and human well-being. While various techniques such as bioremediation, filtration, and adsorption have been employed for wastewater t...

Organochlorine pesticides have been widely used in agriculture to control agricultural pests. Although effective in controlling pests, organochlorine pesticides present numerous hazards to ecosystems and human health due to their persistence in the environment, bioaccumulation, and toxicity. Scientific studies have shown that organochlorines may be...

One of the main drawbacks of the application of photocatalysis for wastewater treatment is the use of dispersed photocatalysts, which are difficult to remove from effluent after the treatment process and may pose additional toxicity to the receiving bodies. As an alternative, immobilized catalysts can be applied; however, this strategy can increase...

Phosphorous removal from water by two novel adsorbents was achieved with competitive efficiency. The adsorbents were synthesized using a Sol–Gel method by mixing both magnesium and iron chlorides in two proportions: (i) in a stoichiometric (S-MgFeO) ratio, yielding 90% of the MgFe2O4 plus 10% of hematite and (ii) with an excess of Mg that favored a...

Even with the development of alternative fuels and energy sources, the world is still highly dependent to the petroleum production and extraction. Align to this, the treatment of oilfield produced water (OPW) is a global challenge, since for each barrel of extracted oil it is produced 3 barrels of OPW in average. OPW contains numerous organic comp...

Microplastics (MP), i.e., particles measuring less than 5 mm in size, are considered emerging pollutants. The ubiquity of MP is causing great concern among environmental and public health agencies. Anthropogenic activities are responsible for the extensive dispersal of MP in nature. Adverse effects on living organisms, interactions with other conta...

Given the great relevance that adsorption processes have for many applications, especially for the water and wastewater treatment, the development and improvement adsorbent materials is a key research topic. When a new adsorbent is proposed, a good characterization of the material is fundamental to in order to know its properties, support its appli...

Fuel cells represent a source of clean energy generation alternative to current technologies for the use of hydrocarbon fuels. As a result, polymer electrolytic membrane fuel cells (PEMFCs) have acquired great importance in recent years, especially for applications where a quick start is required, such as in automobiles. One of the main components...

The use of graphene-based materials in water purification via adsorption processes has become attractive among the scientific community in the recent decades. Its high porosity, great surface area, and especially, the available functional groups on its surface and potential for modification with new functional groups make graphene a promising adsor...

Micellar-enhanced ultrafiltration (MEUF) is a surfactant-based method used to remove low concentrations of contaminants from water and wastewater streams. The process consists of adding surfactant above the critical micelle concentration (CMC) in the contaminated water to solubilize the contaminant in micelles or to retain ionic contaminants via el...

One of the largest wastewater flows generated in the oil and gas industry is produced water (PW), which can come from oil fields, gas fields or a combination of oil and gas fields. This effluent has a complex and variable chemical composition; it contains a significant amount, sometimes up to 500 mg L−1, of water soluble organic compounds (WSO) tha...

Dark heterogeneous catalysis dismisses the need for both light and additional chemicals, and it also complements or even replaces more traditional pollutant abatement processes. Although recently reported, dark catalysts take several hours to bring the pollutant concentration to under 50 %, tested just with low weight pollutants, and their structur...

Based on CFD’s simulations using RANS and SGDH (Standard Gradient Diffusion Hypothesis), this study presents an alternative to better predict turbulent catalytic systems with surface reaction limited by mass transfer selecting an optimal turbulent Schmidt number (Sct). Simulations of H2O2 degradation were performed in an annular reactor with Mn/Al...

In this article, we studied the influences of velocity, Reynolds number, and volume fraction in oil-water core annular flow (CAF) volume profile in a round horizontal pipe. To carry out the study, we adopted the Volume of Fluid (VOF) method, which is one of the prominent Computational Fluid Dynamics (CFD) study model used for multiphase studies. Th...

Resumo Neste trabalho é avaliado o potencial biocatalítico da lipase de Candida rugosa (LCR) imobilizada em diferentes suportes: carvão ativado, gesso comercial e sílica gel, visando a produção de biodiesel. O método de imobilização por adsorção foi utilizado na imobilização da LCR nos suportes. A eficiência de imobilização expressa em termos da ra...

Produced water treatment has become a challenge for the oil industry to meet environmental legislation requirements, due to several dissolved organic compounds, which are barely removed under conventional treatments. In this work, oil and grease removal from real offshore produced water samples was evaluated by a novel liquid-liquid extraction proc...

Oilfield produced water treatment represent a global challenge due to the presence of several contaminants such as heavy metals and dissolved organic compounds. They cannot be removed by conventional equipment and may threat the environment when discarded. Hence, oil industry has the challenge of manage the produced water according to the disposal...

A two-dimensional process of dyeing yarn coils was modelled in COMSOL Multiphysics to evaluate the dyeing characteristics according to a pilot-scale process. The proposed mathematical model was able to reproduce the experimental data and great importance was identified for the dyebath flow through the axial exit of the coil in relation to the radia...

The removal of water-soluble organics compounds in oilfield produced water (OPW) is currently one of the biggest challenges to meet the environmental legislation, as conventional remediation focuses mainly on removing solids and the dispersed oil fraction. Naphthenic acids (NAs) are present in significant amounts in water-soluble organics compounds...

A transient numerical analysis of natural convection of near-freezing water in a cavity with lateral openings and internal heat sources is carried out to investigate the influence of the heat dissipation rate in the flow configuration. The heat sources were positioned to create buoyancy-opposing and buoyancy-assisted conditions simultaneously and t...

The oilfield produced water treatment has been the focus of intense research, due to the presence of high amount of dissolved organic compounds, heavy metals and other chemicals, whose discharge is regulated by environmental agencies. Between them, naphthenic acids (NAs) are naturally-occurring carboxylic acids that contributes to increase the tota...

This work aimed to enhance the biodegradation of synthetic textile wastewater using pyrolyzed sludge from an effluent treatment plant of a textile industry as biofilm carrier. The control carrier was compared to a carrier supplemented with nutrients (potassium, phosphorus, nitrogen, calcium, and sulfur) that were sequentially adsorbed. These nutrie...

The BTEX compounds have potential pollution with serious risk to the environment and human health. In this study, batch and continuous bioreactors, using biofilms supported on activated carbon particles were studied to remove BTEX compounds. The activated sludge from local wastewater treatment plant was adapted to biodegrade BTEX compounds and used...

In this work, Termamyl® 2X and Bioprep® 3000L were characterized and investigated for their antimicrobial activities by agar diffusion and Minimum Inhibitory Concentration (MIC). Bioprep® 3000L enzyme showed higher antimicrobial activity compared to the Termamyl® 2X against Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli and Can...

Synthetic dyes are an important class of organic pollutants, and a part of the total amount of dye used in dyeing processes are discarded as effluent, which is discharged into the environment with harmful effects on aquatic life. Dyes removal by adsorption is an attractive method due to the effectiveness and economic viability. Thus, in the present...

Maize drying is an important process, especially for storage and conservation. For this study, the experimental stage was carried out using a forced convection dryer with air heated at different temperature conditions (306.05–441.85 K) and flow (0.13–0.256 m ³ /hr), totalizing 15 drying curves. Then the performances of the classic drying kinetics m...

Brazilian sugar cane spirit (cachaça) production is traditional among rural producers in Santo Antônio da Patrulha-RS-Brazil. In this work, in similar conditions used by the producers, the effect of different °Brix and nutrients concentration on sugar cane juice fermentation time and ethanol yield was tested. Sixteen experiments were executed, pred...

Os acidentes de gases tóxicos como vazamentos de amônia podem expor os trabalhadores e a comunidade, provocando desde uma irritação respiratória ou até a morte. A Análise Preliminar de Risco (APR) pode ser utilizada como método para avaliar e qualificar possíveis riscos de vazamentos nas instalações de refrigeração. Esta pesquisa apresenta os resul...

O presente estudo avaliou as condições operacionais que podem maximizar a produção do biogás a partir do uso de biodigestores. Os ensaios experimentais foram conduzidos utilizando dejetos de suínos em fase de terminação, com concentração de sólidos totais na coleta de 70,6% p/v. Os experimentos avaliaram, segundo a metodologia de superfície de resp...

A casca de pequi (Caryocar brasiliense) é um resíduo sem aplicação tecnológica. Assim, o objetivo do trabalho foi estudar a influência de diferentes parâmetros na obtenção do carvão adsorvente sem ativação, da casca de pequi, e sua aplicação na remoção do corante azul de metileno. Na elaboração do carvão foi utilizada técnicas de planejamento exper...

Microbial degradation of toxic compounds like benzene, toluene, and xylene in contaminated water is an important alternative for wastewater treatment processes since it is able to eliminate these toxic compounds even when they are present at low concentrations. Besides, when one is interested in the development of a large scale process, kinetic mod...

The kinetics of the hot‐air drying of soybeans was modeled in order to evaluate the influence of temperature and velocity on the kinetic parameters. A convective dryer with air temperature from 30 to 195C and air flows of 0.75, 1.35, 2.0 and 2.5 m/s was used. Three different mathematical models were applied to simulate the drying process (two empir...

No presente trabalho, foi utilizada a Metodologia de Superficie de Resposta para descrever matematicamente as condicoes que maximizam o processo de descoloracao do corante Preto Reativo 5 pela levedura Candida infanticola UFSJ6A isolada de efluente textil. Utilizou-se o Delineamento Composto Central Rotacional (RSM) para o estudo dos efeitos combin...

In this study a three-dimensional model was employed to numerically investigate the natural convection inside a partially-open cubic cavity with internal heat source. The boundary conditions are set so that two opposite vertical walls are maintained at different constant temperatures while the others walls are considered adiabatic. An opening occup...

Neste trabalho, foi realizado um estudo para avaliar as principais variáveis de processo na produção de uma bebida fermento-destilada a partir do pseudofruto da uva-japão (Hovenia dulcis Thunberg). Foram avaliados os efeitos da temperatura, do tempo de fermentação e da adição de micronutrientes (Mn+2 e K+) sobre a graduação alcoólica, além do pH e...

p> The production of a fermented distilled drink from Japanese grape is presented as a good option of income complement to small farmers. The fermentative tests were conducted under different juice dilutions of Japanese grape (30 and 50%), different temperatures (30 and 35 °C), with and without the addition of micronutrients (sources of K+, Mn++)....

The adsorption of benzene, toluene, and o-xylene (BTX) in monocomponent and multicomponent aqueous solutions onto activated carbon was studied in a batch reactor at 23 degrees C for wastewater reuse. The kinetics and thermodynamic equilibrium parameters were obtained for all compounds, where the competitiveness for the active site of adsorption was...

The effects associated with the transport phenomena inside the fuel cells, including the multiphase nature of the flow were studied using a mathematical model. Different operational conditions were evaluated to determine the influence of input parameters on the fuel cell operation. The results showed a strongly combined effect of the variables on t...

a b s t r a c t In this study it is investigated the performance of a proton exchange membrane fuel cell. The results show that an inclination of 0.75° in the flow channel can effectively increase the current density gener-ated by almost 9.5% and the maximum power density by 8%. With the use of more tapered channels the distribution of the reactant...

There is currently a great demand for tools that allow the analysis of water networks in a practical and objective way. In the modern scenarios chemical industries need to consume water in more rational forms to minimize the risk of water scarcity caused by pollution. Some of the alternatives for reducing water consumption involve the reuse and/or...

A steady buoyancy-driven flow of air in a partially open square 2D cavity with internal heat source, adiabatic bottom and top walls, and vertical walls maintained at different constant temperatures is investigated numerically in this work. A heat source with 1% of the cavity volume is present in the center of the bottom wall. The cold right wall co...

Application of Biofilm in the Degradation of Contaminants in Industrial Effluents, Chapter 10 of Book: Biofilms: Formation, Development and Properties, Editor: William C. Bailey, ISBN: 978-1-61728-293-5, Nova Science Publishers, Inc., NY, USA, 2011.

This article presents an investigation into natural convection in trapezoidal cavities. It examines a cavity whose floor and upper inclined walls are both adiabatic, while the vertical walls are isothermal. For these isothermal walls, we consider two thermal boundary conditions. Under the first condition, the short wall on the left side is heated a...

In this study the biodegradation process of toxic compounds such as benzene, toluene ethylbenzene and o-xylene (BTEX), present in petrochemical effluents is described by a phenomenological model expressed through a single differential equation which allows the description of the concentration profile through a fixed bed biofilm reactor. The mechani...

A numerical study of the thermal and fluid dynamic behavior of air in partially open two-dimensional enclosures is presented. An analysis is made based on two aspects of the radius, H/W = 1 and 2. The left and right walls are maintained at different constant temperatures, while the upper and bottom walls are thermally insulated. The enclosure has a...

A numerical study of the thermal and fluid dynamic behavior of air in a partially open two-dimensional enclosure is presented The enclosure has an opening on the right-hand vertical wall, which is kept at a low given temperature, while the opposite wall has a high given temperature. The natural convection in the enclosure is influenced simultaneous...

This work simulated numerically the n-pentane separation of a mixture of iso-pentane, n-pentane and nitrogen, using an adsorption column with zeolite 5A. The mathematical model equations of the mass and heat transfer in the adsorption column are presented, as well as the boundary and initials conditions, beyond some hypotheses and considerations. T...

This work simulated numerically the n-pentane separation of a mixture of iso-pentane, n-pentane and nitrogen, using an adsorption column with zeolite 5A. The mathematical model equations of the mass and heat transfer in the adsorption column are presented, as well as the boundary and initials conditions, beyond some hypotheses and considerations. T...

This work simulated numerically the n-pentane separation of a mixture of iso-pentane, n-pentane and nitrogen, using an adsorption column with zeolite 5A. The mathematical model equations of the mass and heat transfer in the adsorption column are presented, as well as the boundary and initials conditions, beyond some hypotheses and considerations. T...