EAJ - Artigos publicados em periódicos

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Recuperação de proteína do soro de leite bovino usando cromatografia de interação hidrofóbica em leito expandido
(Revista Higiene Alimentar, 2009) Santos, Everaldo Silvino dos; Cavalcanti, Jorge dos Santos; Magalhães, Margarida Maria dos Anjos
O presente trabalho teve por objetivo estudar a adsorção das proteínas do soro de queijo tipo “coalho” para a resina de interação hidrofóbica StreamlineTM Phenyl usando o leito na forma expandida. Foi utilizada uma coluna de 2,6 cm de diâmetro por 30 cm de altura, acoplada a uma bomba peristáltica. Uma amostra de solução de soro (250 mL) foi aplicada a uma coluna contendo a resina StreamlineTM Phenyl (25 mL) previamente equilibrada em tampão Tris/HCl (50 mM, pH 7,0) com NaCl (1,0 M), após lavagem a eluição foi conduzida a temperatura ambiente em tampão Tris/HCl (50 mM, pH 7,0) e altura de leito fixo de 5,0 cm. Os resultados mostraram que foi possível recuperar 37% das proteínas inicialmente contidas no soro em uma única etapa
Caracterização socio-econômico-cultural de raizeiros e procedimentos pós-colheita de plantas medicinais comercializadas em Maceió, AL
(Revista Brasileira de Plantas Medicinais, 2009) Araújo, Afranio Cesar; Silva, J. P.; Cunha, J. L. X. L.; Araújo, J. L. O.
Síndromes de polinização ocorrentes em uma área de Mata Atlântica, Paraíba, Brasil
(Biotemas, 2009-12) Araújo, Afrânio César de; Gadelha Neto, Pedro da Costa; Quirino, Zelma Glebya Maciel; Araújo, Jussiara de Lima Oliveira
Síntese e caracterização de argilas organofílicas contendo diferentes teores do surfactante catiônico brometo de hexadeciltrimetilamônio
(Sociedade Brasileira de Química, 2011) Lopes, Christian Wittee; Penha, Fábio G.; Braga, Renata Martins; Melo, Dulce Maria de Araújo; Pergher, Sibele Berenice Castellã
The major applications of organoclays are in adsorption of organic polluents. The objective of this work was the synthesis and characterization of organoclays using differents amounts of cationic surfactant hexadecyltrimethylammonium bromide. The clays were characterized by low angle x-ray diffraction (XRD), scanning electron microscope (SEM), infrared with Fourier tranformation (FTIR), BET surface area, elemental analysis (CHN), Foster swell and adsorption of methylene blue. The surfactant can adsorb in differents forms in the interlamelar region changed the basal spacing. The presence of the surfactant adsorbed can be favorable or not in adsorption of the methylene blue due the different interactions dye-organoclays.
Recuperação de proteína do soro de queijo de coalho, por adsorção em leito expandido, utilizando resina de troca aniônica e catiônica
(Revista Higiene Alimentar, 2012) Santos, Everaldo Silvino dos; Cavalcanti, Jorge dos Santos; Soares, Jardelson César; Macedo, Gorete Ribeiro de
O presente trabalho teve como objetivo recuperar e purificar proteínas presentes no soro de queijo tipo coalho, através da técnica de adsorção em leito expandido, utilizando resinas de troca aniônica Streamline® DEAE e troca catiônica Streamline® SP. Experimentos iniciais permitiram avaliar a adsorção das proteínas para as resinas usando tanques agitados. Nos experimentos em leito expandido, foi utilizada uma coluna de 2,6 cm de diâmetro por 30 cm de altura, acoplada a uma bomba peristáltica. Uma amostra de solução de soro (250 mL) foi aplicada a uma coluna contendo a resina (25 mL) previamente equilibrada em tampão Tris/HCl (50 mM, pH 7,0), após aplicação da amostra e da lavagem, efetuou-se a eluição, à temperatura ambiente, adicionando-se NaCl (1,0 M) ao tampão Tris/HCl (50 mM, pH 7,0). Os resultados dos experimentos em tanques agitados mostraram que para as três condições iniciais de concentração de proteína a quantidade adsorvida na fase sólida foi de 249,2 mg/mL de adsorvente, 9,4 mg/mL de adsorvente e 14,4 mg/mL de adsorvente e de 291,0 mg/mL de adsorvente, 6,3 mg/mL de adsorvente e 3,9 mg/mL de adsorvente para as resinas Streamline® DEAE e Streamline® SP, respectivamente, correspondendo aos valores de aproximadamente 71,6%, 6,8% e 21,8% e 83,6%, 4,6% e 5,9% de recuperação das proteínas inicialmente existentes, para as resinas Streamline® DEAE e Streamline® SP, respectivamente. Experimentos usando o leito na forma expandida mostraram que é possível recuperar aproximadamente 16% e 23%, respectivamente, para as duas resinas
Characterization and thermal behavior of PrMO3 (M = Co or Ni) ceramic materials obtained from gelatin
(Elsevier, 2012-09) Aquino, Flávia de Medeiros; Melo, Dulce Maria de Araújo; Pimentel, Patrícia Mendonça; Braga, Renata Martins; Melo, Marcus Antônio De Freitas; Martinelli, Antonio Eduardo; Costa, Asenete Frutuoso
Metal oxides with perovskite-type structure have attracted considerable interest in recent years due to their magnetic and electrical properties, as well as their catalytic activity. In this study, oxides with PrNiO3 and PrCoO3 composition were prepared by using gelatin powder as a precursor agent for its use as a catalyst. The powders obtained were calcined at 700 8C and 900 8C and characterized using the X-ray diffraction, thermal analysis (thermogravimetry and differential thermal analysis), infrared spectrosco- py, temperature programed reduction and scanning electron microscopy techniques. Thermogravimetric data using the non-isothermal kinetic models of Flynn and Wall and ‘‘Model-free Kinetics’’ were used to determine the activation energy to study the decomposition kinetics of the ligand groups with system’s metallic ions that takes part in the synthesis of PrMO3 (M = Ni or Co)
Modeling and simulation of breakthrough curves during purification of two chitosanases from Metarhizium anisopliae using ion-exchange with expanded bed adsorption chromatography
(Springer Nature Switzerland, 2014-02-17) Santos, Everaldo Silvino dos; Santana, Sergio Carvalho de; Silva Filho, Raimundo Cosme da; Cavalcanti, Jorge dos Santos; Oliveira, Jackson Araujo de; Macedo, Gorete Ribeiro de; Padilha, Francine Ferreira
A mathematical model was developed to predict breakthrough curves during purification of the two chitosan- ases from Metarhizium anisopliae by expanded bed adsorption, taking into account the axial dispersion of liquid and using Streamline DEAE and SP XL adsorbents, anion and cation exchange resins, respectively. All the experiments were performed without clarification (with cells) aiming at the reduction of unit operations in future projects of separation processes, thereby reducing capital and operating costs. Chitosanases are enzymes that hydrolyze the carbohydrate chitosan, resulting in oligosaccharides that have many remarkable biological activities, such as anti-cancer, anti-HIV and antioxidant activities. The two adsorbents had similar performance in relation to hydrodynamics and mass transfer. The results of the parametric sensitivity analysis agree with the literature, and the model was validated with an average high degree of fit (94.68%) between simulated and experimental data obtained in this work
Comparison of kinetic study of CTMA+ removal of molecular sieve Ti-MCM-41 synthesized with natural and commercial silica
(ABM, ABC, ABPol, 2015) Melo, Marcus Antônio de Freitas; Fontes, Maria do Socorro Braga; Melo, Dulce Maria de Araújo; Costa, Cintia de Castro; Braga, Renata Martins; Alves, José Antônio Barros Leal Reis
This work aimed to determine and compare the apparent activation energy, involved in thermal decomposition of CTMA+ from the pores of Ti-MCM-41 synthesized by two different source of silica in order to evaluate their influence in the template removal. The molecular sieves Ti-MCM-41 were synthesized using rice husk ash (RHA), as alternative low cost source of silica, and commercial silica gel, obtaining two mesoporous material by hydrothermal synthesis of gel molar composition of: 1.0 CTMABr: 4.0 SiO2 : X TiO2 : 1.0 Na2 O: 200.0 H2 O. The samples were characterized to compare its properties by X-ray diffraction, IR spectroscopy, BET method and thermogravimetric analysis (TGA). The kinetic study using the model proposed by Flynn and Wall to determine the apparent activation energy for CTMA+ removal was performed using TGA data. The thermogravimetric analysis results of the material obtained from RHA confirmed intrinsic properties of mesoporous MCM-41 as the synthesized with commercial silica gel, such as high specific area, mesoporous range of pore diameter and hexagonal structure. According to the kinetics results the RHA showed similar chemical interaction to commercial silica gel, which makes it an interesting material, since it is a low cost source of natural silica from agricultural waste
Estudo do perfil térmico de fornos do tipo "caipira" utilizados pelo setor de cerâmica vermelha em Parelhas na Região do Seridó, RN
(Sociedade de Investigações Florestais, 2015) Silva, Áurea de Paula Medeiros e; Santos, Rosimeire Cavalcante dos; Castro, Renato Vinícius Oliveira; Carneiro, Angélica de Cássia Oliveira; Paskocimas, Carlos Alberto; Marinho, George Santos
Este trabalho teve como objetivo caracterizar o perfil térmico de fornos tipo "caipira" utilizados pelo setor de cerâmica vermelha em Parelhas, na região do Seridó, RN, visando propor intervenções estruturais que possam colaborar para aumentar a produtividade e qualidade dos produtos, otimizar o consumo de madeira e mitigar as perdas durante o processo de queima. O trabalho foi desenvolvido na Cerâmica Esperança, na cidade de Parelhas, RN. Foram realizados quatro tratamentos com três repetições, sendo a argila o parâmetro utilizado como referência para distinguir os tratamentos. Foram monitorados a quantidade da lenha, a qualidade da telha e o tempo de cada queima. Foram aferidas temperaturas em 15 pontos marcados na superfície da carga enfornada, em intervalos de 30 min a partir do pré-aquecimento até o final da queima, utilizando um pirômetro de mira a laser. Os resultados indicaram que a madeira utilizada como lenha apresentou densidade sem diferença significativa entre os tratamentos, umidade dentro dos padrões permitidos e consumo heterogêneo, enquanto a argila teve pouca retração linear quando submetida ao fogo e o forno, perfil térmico heterogêneo. O parâmetro do fio, que é utilizado como referência para o controle da queima, foi significativo, embora com oscilações diferenciadas, razão por que não deve ser o único critério para finalização do processo de queimas. A parte central do forno foi a área que atingiu maiores temperaturas de maneira homogênea, com maior concentração de produtos de primeira qualidade; a curva de temperatura ideal foi do tratamento 1, com uma média de 18,66% de produto de primeira qualidade, com temperatura de 100 °C a 400 °C
The energetic characterization of pineapple crown leaves
(Springer Nature, 2015-08-02) Melo, Marcus Antônio de Freitas; Braga, Renata Martins; Queiroga, T. S.; Calixto, Guilherme Quintela; Almeida, Hanna Nóbrega; Melo, Dulce Maria de Araújo; Freitas, Júlio César de Oliveira; Curbelo, Fabiola Dias da Silva
Energetic characterization of biomass allows for assessing its energy potential for application in different conversion processes into energy. The objective of this study is to physicochemically characterize pineapple crown leaves (PC) for their application in energy conversion processes. PC was characterized according to ASTM E871-82, E1755-01, and E873-82 for determination of moisture, ash, and volatile matter, respectively; the fixed carbon was calculated by difference. Higher heating value was determined by ASTM E711- 87 and ash chemical composition was determined by XRF. The thermogravimetric and FTIR analyses were performed to evaluate the thermal decomposition and identify the main functional groups of biomass. PC has potential for application in thermochemical processes, showing high volatile matter (89.5 %), bulk density (420.8 kg/m3), and higher heating value (18.9 MJ/kg). The results show its energy potential justifying application of this agricultural waste into energy conversion processes, implementing sustainability in the production, and reducing the environmental liabilities caused by its disposal
Secagem da polpa de graviola pelo processo Foam-Mat e avaliação sensorial do produto obtido
(UnP, 2015-08-10) Dieb, Judith Teixeira; Gurgel, Camilla Emanuelle Mendes Rocha; Dantas, Thayse Naianne Pires; Medeiros, Maria de Fátima Dantas de
Foram realizados ensaios de secagem em camada de espuma da polpa de graviola com adição de 1% de emustab e 1% de liga neutra. Estudou-se os efeitos da temperatura (50°C, 60°C e 70°C) e espessura da camada (0,30 cm, 0,45 cm e 0,60 cm) na cinética de secagem, avaliando-se o comportamento das curvas de secagem e as características físico - químicas do produto em pó (umidade e atividade de água). Iogurtes saborizados com 7% de pó de graviola obtidos na secagem foram submetidas à análise sensorial que foi realizada mediante teste de avaliação utilizando 50 provadores não treinados. Cada provador emitiu notas para os atributos aparência, odor, sabor e textura. O produto apresentou índice de aceitabilidade superior a 70% e conforme a classificação qualitativa, as médias das notas ficaram compreendidas entre gostei ligeiramente e gostei regularmente (6,63 a 7,55 para os atributos odor e textura, respectivamente)
Efeito de diferentes fontes de sílica nos parâmetros texturais da peneira molecular MCM-41
(Associação Brasileira de Cerâmica - ABCeram, 2016) Melo, Marcus Antônio de Freitas; Fontes, Maria S. B.; Melo, Dulce Maria de Araújo; Costa, Cíntia de Castro; Alves, J. A. B. L. R.; Silva, M. L. P.; Braga, Renata Martins
Nas últimas décadas, pesquisas estão sendo desenvolvidas para obtenção de materiais eficientes e economicamente viáveis para aplicação em diversos setores da indústria. Os materiais mesoporosos da família MCM-41 estão entre os candidatos eficazes pela facilidade de síntese e estrutura que favorece uma gama de aplicações. O objetivo desse trabalho foi apresentar uma abordagem rítica das características e propriedades dos materiais mesoporosos do tipo MCM-41, enfocando nos aspectos estruturais. Além isso, foram discutidas as vantagens e desvantagens do uso de sílica comerciais e alternativas. As fontes de sílica comerciais analisadas foram sílica gel e TEOS; já as fontes de sílica alternativas foram cinza da casca de arroz, quartzo e pó de vidro. Os materiais analisados foram sintetizados pelo método hidrotérmico e caracterizados por DRX, FTIR, BET e TG. Os resultados apresentados comprovam a eficiência das fontes de sílica alternativas na síntese do MCM-41, pois os materiais apresentaram propriedades texturais dentro dos padrões exigidos. Dessa forma, eles estão aptos a serem testados na indústria em substituição aos MCM-41 sintetizados com fonte de sílica comercial
Soil contamination by heavy metals in vineyard of a semiarid region: an approach using multivariate analysis
(Elsevier BV, 2016-11-22) Cunha, Karina Patrícia Vieira da; Preston, Welka; Silva, Yuri J. A. B. da; Nascimento, Clístenes W. A.; Silva, Davi J.; Ferreira, Hailson A.
Contamination of vineyard soils by the continuous use of cupric fungicides and fertilizers has been a worldwide concern. The objective of this study was to determine the total concentration of Cu, Zn, Fe, Mn, Ni and Pb from vineyard soils of a semiarid region in Brazil. Soil samples at 0–20 and 20–40 cm depth were collected in areas under 5, 6, 8, 10, 12, 15, 16 and 30 years of cultivation, and compared with native vegetation areas. Samples were digested and total metal concentrations were determined by atomic absorption spectrophotometer. In general, concentrations of Mn, Ni, Fe and Pb were similar to those values found in the reference area, being regarded as background concentrations. On the other hand, Zn and Cu were mainly derived from the widespread use of fertilizers (e.g., phosphate application) and cupric fungicides, respectively. Discriminant analysis clearly demonstrated higher metal accumulation in surface soil samples, chiefly Zn and Cu owing to Zn and Cu-containing chemicals and accumulation of organic matter. This tool was also useful to differentiate between natural and anthropogenic inputs of metals into soils. The high enrichment factor values for Cu and Zn showed that both were mainly derived from anthropogenic sources
Representação tridimensional de processos de erosão costeira em ilhas barreiras utilizando tecnologia de jogos
(Anuário do Instituto de Geociências, 2017) Diniz, Carlos Henrique Grilo; Amaro, Venerando Eustáquio; Prudêncio, Mattheus da Cunha; Felipe, Renan Farias
O presente artigo descreve o desenvolvimento de uma metodologia de representação tridimensional de processos de erosão costeira em praias arenosas utilizando tecnologia de jogos. Essa representação visa auxiliar os profissionais das geociências e das engenharias, de forma lúdica e interativa, nos constantes desafios de melhor apresentar as mudanças na morfologia. Essas mudanças são promovidas pela interação entre processos continentais, oceanográficos e atmosféricos somados às atividades antrópicas, que combinadas, modificam estes ambientes. São apresentadas ainda, as etapas e o luxo para implementação de protótipos de simulação utilizando a abordagem de jogos sérios com a ferramenta de desenvolvimento de jogos Unity 3D
Nickel catalyst supported on magnesium and zinc aluminates (MgAl2 O4 and ZnAl2 O4 ) spinels for dry reforming of methane
(Associação Brasileira de Cerâmica - ABCeram, 2017) Melo, Marcus Antônio de Freitas; Araújo, Larissa Costa Barros de; Melo, Dulce Maria de Araújo; Barros, J. M. de F.; Braga, Renata Martins; Costa, C. de C.; Rodrigues, G.
Materials such as MgAl2O4 and ZnAl2O4 assessed in the reaction of dry reforming of methane to produce syngas were synthesized by microwave-assisted combustion method using urea as fuel. Samples of synthesized oxides were calcined at 800 °C for 2 h and impregnated with 5% nickel. The impregnated samples were calcined at 850 °C for 4 h to obtain the desired phases. The results of the catalytic tests showed that the catalysts are active for the reaction of dry reforming of methane, and the catalyst that showed the best performance for methane conversion was 5% Ni/MgAl2 O4 calcined at 850 °C/4h
Catalytic upgrading of Elephant grass (Pennisetum purpureum Schum) pyrolysis vapor using WO3 supported on RHA and RHA-MCM-41
(Elsevier, 2017-01-01) Melo, Marcus Antônio de Freitas; Braga, Renata Martins; Melo, Dulce Maria de Araújo; Vitor Sobrinho, Eledir; Barros, Joana Maria de Farias; Carvalho, Alexandre Fontes Melo de; Fontes, Maria do Socorro Braga; Freitas, Júlio César de Oliveira
Recently, zeolites have been widely applied in catalytic pyrolysis to improve physical and chemical properties of bio-oil to produce energy or to selectively produce chemicals for industry. This study aims to analyze the catalytic pyrolysis products of Elephant Grass (EG) using WO3 catalysts supported on rice husk ash (RHA) silica and RHA-MCM-41, being low cost materials derived from agro industrial waste, and evaluate the catalysts activity in the formation of deoxygenated compounds. Elephant Grass has been shown as a potential energy crop that has fast growth and is easy to cultivate in different countries, including Brazil. Its energetic characterization was evaluated by proximate and ultimate analysis, High Heat Value (HHV), cellulose, hemicellulose and lignin content, chemical ash composition by FRX and bulk density. Pyrolysis analysis was performed at 500 ◦C in a Py-5200 HP-R connected to a GC–MS, and pyrolysis vapors were carried by N2 to a catalytic bed at 400 and 600 ◦C. It was noticed that increasing catalyst temperature promotes cracking reactions leading to increased aromatic content. The main oxygenated pyrolysis products of EG such as phenols, furans, ketones and acetic acid were converted at 600 ◦C using WO3/RHA catalyst into aromatics (benzene, toluene, xylene, styrene), being of high added value for chemical industry. The main influence on aromatics yields could be related to catalytic activity of WO3 promoted by its redox ability and the rise in temperature which favors cracking reactions
Characterization and pyrolysis of Chlorella vulgaris and Arthrospira platensis: potential of bio-oil and chemical production by Py-GC/MS analysis
(Springer Nature, 2017-04-17) Melo, Marcus Antônio de Freitas; Almeida, Hanna Nóbrega; Calixto, Guilherme Quintela; Chagas, Bruna M. E.; Melo, Dulce Maria de Araújo; Resende, Fabio M.; Braga, Renata Martins
Biofuels have been seen as potential sources to meet future energy demand as a renewable and sustainable energy source. Despite the fact that the production technology of first-generation biofuels is consolidated, these biofuels are produced from foods crops such as grains, sugar cane, and vegetable oils competing with food for crop use and agricultural land. In recent years, it was found that microalgae have the potential to provide a viable alternative to fossil fuels as source of biofuels without compromising food supplies or arable land. On this scenario, this paper aims to demonstrate the energetic potential to produce bio-oil and chemicals from microalgae Chlorella vulgaris and Arthrospira platensis. The potential of these biomasses was evaluated in terms of physical-chemical characterization, thermogravimetric analysis, and analytical pyrolysis interfaced with gas chromatograph (Py-GC/MS). The results show that C. vulgaris and A. platensis are biomasses with a high heating value (24.60 and 22.43 MJ/kg) and low ash content, showing a high percentage of volatile matter (72.49 and 79.42%). These characteristics confirm their energetic potential for conversion process through pyrolysis, whereby some important aromatic compounds such as toluene, styrene, and phenol were identified as pyrolysis products, which could turn these microalgae a potential for biofuels and bioproduct production through the pyrolysis
Study of the reactivity by pulse of CH4 over NiO/Fe-doped MgAl2O4 oxygen carriers for hydrogen production
(Elsevier, 2017-09-28) Melo, Marcus Antônio de Freitas; Medeiros, Rodolfo Luiz Bezerra de Araújo; Macedo, Heloísa Pimenta de; Figueredo, Gilvan Pereira de; Costa, Tiago Roberto da; Braga, Renata Martins; Melo, Dulce Maria de Araújo
The reactivity of Ni-based oxygen carrier (OC) was studied by CH4 pulse test. The MgAl2O4 spinel was synthesized by microwave assisted combustion method and Ni and Fe were added by wet impregnation method. The results of CH4 pulse test revealed that the OCs were more reactive for partial oxidation reaction. The XRD analysis of OCs after the test confirms the presence of NiO and MgAl2O4 without the secondary phases like NiAl2O4 and FeAl2O4. Among the OCs, Ni15Fe2MA was the most reactive producing the highest amounts of H2 and exhibiting good re-oxidation capacity, illustrating its potential for use in Chemical Looping Reforming (CLR). The high reactivity is associated to a change on the NiO-support interaction
Study of the reactivity of Double-perovskite type oxide La1¡xMxNiO4 (M 1⁄4 Ca or Sr) for chemical looping hydrogen production
(Elsevier, 2018-01-18) Melo, Marcus Antônio de Freitas; Melo, Vítor Rodrigo de Melo e; Medeiros, Rodolfo Luiz Bezerra de Araújo; Braga, Renata Martins; Macedo, Heloísa Pimenta de; Ruiz, Juan Alberto Chavez; Moure, Gustavo Torres; Melo, Dulce Maria de Araújo
La2-xMxNiO4 perovskite oxygen carriers (OC) doped with Ca and Sr (x 1⁄4 0.05 and 0.20) in the site La were prepared by microwave assisted combustion method and calcined at 800 C for 2 h. A reactivity study was carried out applying pulses of H2, O2 and CH4. The reactions involved in each step, as well as H2 production, were studied to evaluate the redox properties of each OC. The crystalline structure, morphology, reduction and oxidation profiles were determined by XRD, SEM and TPR/TPO cycles, respectively. The results indicate that the dopant (Ca or Sr) strongly affect the structure and reactivity of the OC. The increase in dopant concentration increased the degree of crystallinity and the amount of the A2BO4 phase formed. The increase in dopant concentration decreased the reducibility of the perovskite. OCs doped with Ca showed higher conversion percentages, and also higher H2 production. In carriers doped with Sr no coke formation was observed.
Sulfur removal from model fuel by Zn impregnated retorted shale and with assistance of design of experiments
(Springer, 2018-03-05) Martinelli, Antonio Eduardo; Lima, Flávia Melo de; Borges, Talitha de Andrade; Braga, Renata Martins; Melo, Dulce Maria de Araújo
There is global concern about acid rain and other pollution which is caused by the consumption of oil. By decreasing sulfur content in the oil, we can reduce unwanted emissions and acid rain. Shale was used which is a solid waste generated in the pyrolysis of shale, impregnated with Zn as an adsorbent which removes sulfur present in fuels from the hexane/toluene model solution. An influence of the agitation time (60–180 min), temperature (25–35 °C), adsorbent mass (0.1–0.25 g), and initial sulfur concentration (100–250 ppm) factorial 24 with three central points totaling 19 experiments was applied to investigate the effect of the variables on the efficiency of sulfur removal in fuels. The values of the parameters tested for maximum sulfur removal were obtained as follows: contact time = 180 min, temperature = 35 °C, adsorbent mass = 0.25 g, and initial sulfur concentration = 100 ppm. The mathematical model proposed with R2 99.97% satisfied the experimental data. This may provide a theoretical basis for new research and alternative uses for tailings of schist industrialization in order to evaluate its potential

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