Cu(II) adsorption from aqueous solution using red mud activated by chemical and thermal treatment

Conceição, Fabiano Tomazini da; Pichinelli, Beatriz Cestaro; Silva, Mariana S. G.; Moruzzi, Rodrigo Braga; Menegário, Amauri Antônio; Antunes, Maria Lúcia Pereira

doi:10.1007/s12665-015-4929-y

Cited by 20 publications

(6 citation statements)

References 19 publications

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“…The amount of RB19 adsorbed onto the AB at equilibrium time, q e (mg/g), and the adsorption percentage (%A) were determined using equations 1 and 2, respectively. 34,35 (2)…”

Section: Removal Experimentsmentioning

confidence: 99%

Biochar from sugarcane bagasse for reactive dye adsorption considering a circular economy approach

Conceição¹,

Moruzzi²,

Duarte³

et al. 2022

JTEFT

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Ethanol from sugarcane has advantages over fossil fuel in reducing greenhouse gas emissions and improving the air quality in cities. However, ~280kg of sugarcane bagasse, an agro-industrial waste, are still generated during the processing of 1 ton of sugarcane. In this paper, the sugarcane bagasse, was converted into activated biochar (AB) and the physicochemical properties and morphology of the AB were determined. The potential absorbent for reactive blue 19 dye (RB19) onto AB under different conditions was studied, considering the pH influence, adsorption isotherms, kinetic studies and thermodynamic parameters. Finally, a preliminary circular economic analysis was also performed. The characterization of AB showed microtubes of up to 1µm diameter and cavities lower than 0.5µm, with a specific surface area of 687m2/g and an iodine number of 656mg I2/g. The Freundlich adsorption isotherm resulted in the best fit for the experimental data, with maximum adsorption of 58.1 mg/g at pH 2 and 31.4mg/g at pH 5. The adsorption took place in the first 2h, following a pseudo-second-order kinetic model. The thermodynamic experiments showed that higher temperatures improved the removal efficiency by ~10% and that the process is endothermic. The preliminary circular economic analysis for AB preparation revealed a cost of 2.18USD/Kg of adsorbent. This study indicates that AB is an economical material for large-scale wastewater treatment in textile industries, offering an alternative pathway for the agro-industrial waste generated during the ethanol production.

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“…The amount of RB19 adsorbed onto the AB at equilibrium time, q e (mg/g), and the adsorption percentage (%A) were determined using equations 1 and 2, respectively. 34,35 (2)…”

Section: Removal Experimentsmentioning

confidence: 99%

Biochar from sugarcane bagasse for reactive dye adsorption considering a circular economy approach

Conceição¹,

Moruzzi²,

Duarte³

et al. 2022

JTEFT

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“…Uma das maiores áreas específicas para a LV sem qualquer tratamento foi encontrada por Wang (2005) A LVB apresentou a seguinte análise mineralogia: gibbsita (Al(OH)3) (00-029-0041), sodalita (Na8(Al6Si6O24(CO3)(H2O)3)) (01-085-2066/00-003-0338), calcita (CaCO3) (00-001-0837), hematita (Fe2O3) (01-087-1164)) e anatásio (TiO2) (00-001-0562). A fase dominante na lama vermelha é a hematita, representada pelos picos 24,12°, 33,16°, 35,65°, 40,90°, 49,49°, 54,12°, 62,54°e 64,00°. Na amostra LVC após o processo de calcinação, verifica-se o desaparecimento dos picos 18,27°e 20,27° e 21,30° correspondentes à gibbsita, o que pode indicar a decomposição da mesma em Al2O3 (KURTOGLU et al, 2016;CONCEIÇÃO et al, 2016). Verifica-se que para a LVC a os picos de maiores intensidades correspondem à hematita (Fe2O3), devido à decomposição de hidróxidos de ferro em hematita e pela decomposição de minerais complexos.…”

Section: Caracterização Do Materials Adsorventeunclassified

Remoção de tolueno via processo de adsorção utilizando lama vermelha

Júnior

Maciel

Carvalho

et al. 2020

BJD

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RESUMO O objetivo deste trabalho é avaliar a capacidade da lama vermelha (LV), nas formas in natura (LVB), térmica (LVC) e quimicamente ativada (LVA), como adsorventes para remoção de tolueno em efluentes aquosos. A caracterização das amostras mostrou que os materiais são essencialmente mesoporoso, suas partículas não apresentam tamanhos e formas definidas, e seus principais constituintes são: gibbsita, sodalita, calcita, hematita e anatásio. Para a LVC foi aplicada a função de desejabilidade através do planejamento de experimentos, sendo obtido valor ótimo de concentração inicial de 3,0 mmol/L, dosagem de adsorvente de 10 g/L e pH de 4, para otimização do processo de adsorção. Para a avaliação da cinética de adsorção das amostras verificou-se que o modelo de pseudo-segunda foi o que melhor representou os resultados experimentais. No estudo do equilíbrio de adsorção o modelo de Sips foi o que melhor se ajustou aos dados experimentais para todos os adsorventes estudados, apresentando um coeficiente de determinação bem próximo à unidade.

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“…Size fractionation is a simple, low-cost upgrading practice that can get rid of accessory minerals and additionally lead to separating the clay into different grain-size fractions, each fraction with different chemical composition and physical properties. Thermal activation is aimed at increasing the adsorptive capacity of the soil 9,10 . Besides, soil heating directly affects microorganisms by either killing them directly or altering their reproductive capabilities.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Kaolin-rich Laterite Soil for Applications for the Development of Soil-based Cosmetic Products

Dissanayake

Pupulewatte

Jayawardana

et al. 2022

J. Drug Delivery Ther.

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The present study aims to characterize the properties of the raw and thermally activated laterite soil to be used to develop cosmetic products. Collected soil samples were washed and air-dried for 48 hours, collected soil samples were air-dried for 48 hours. Air-dried soil was crushed to create 500 µm powdered materials. Thermally activated soil samples were prepared by heating the laterite soil at 100 0C, 200 0C, 300 0C, and 400 0C for 3 hours in a muffle furnace. The physicochemical properties of laterite such as morphology, surface functional groups, elemental composition, surface area, and trace elements were analyzed. The Cell Forming Unit (CFU) was counted in the raw soil, and thermally activated soil samples at the beginning. Antimicrobial Assay was tested with Candida albicans, Pseudomonas aeruginosa, Staphylococcus aureus microorganisms in raw and thermally activated laterite soil. An uncountable amount of microorganisms per gram was observed in the raw soil sample and fewer microorganisms were counted in 100 0C, and 200 0C samples. The CFU was zero microorganisms per gram for the 300 0C, and 400 0C samples. The optimum density of the culture is measured to estimate the growth of the microbial cells. Oil absorption, sweat absorption and swelling capacity were used to characterize the samples with raw and thermally activated soils. The characterization results indicated that chosen soil samples have good oil and sweat absorption, good swelling capacity and microbiological safety, making them suitable for cosmetic applications. Keywords: Cosmetics, Chemical analysis, Laterite soil, Microbiology, Thermally activation, physiochemical features

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Cu(II) adsorption from aqueous solution using red mud activated by chemical and thermal treatment

Cited by 20 publications

References 19 publications

Biochar from sugarcane bagasse for reactive dye adsorption considering a circular economy approach

Biochar from sugarcane bagasse for reactive dye adsorption considering a circular economy approach

Remoção de tolueno via processo de adsorção utilizando lama vermelha

Characterization of Kaolin-rich Laterite Soil for Applications for the Development of Soil-based Cosmetic Products

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