Biochars obtained from arabica coffee husks by a pyrolysis process: characterization and application in Fe(<scp>ii</scp>) removal in aqueous systems

Guimarães, Tiago; Teixeira, Ana Paula C.; Oliveira, André Fernando de; Lopes, Renata Pereira

doi:10.1039/c9nj04144c

Cited by 30 publications

(8 citation statements)

References 61 publications

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“…In recent years, a growing trend has been the use of solid waste residuals (biomass) as biosorbents in decontamination processes, especially biomass from the food industry, such as coconut shell, orange peel, banana peel, coffee husks, among others [25,26,[28][29][30][31].…”

Section: Graphical Abstractmentioning

confidence: 99%

“…Because they are waste products, these lignocellulosic materials comes at no cost of production and often has the characteristics necessary to serve as a good adsorbent, such as high concentration of minerals especially carbon, silicon and aluminum, high volatile content, which helps generate a rich pore structure and usually they are high-density materials, characteristic that positively influences the mechanical properties of the generated adsorbents [22,28]. This means that extremely efficient and low cost adsorbent materials can be obtained [31].…”

Section: Graphical Abstractmentioning

confidence: 99%

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Development of Adsorbent Materials Using Residue from Coffee Industry and Application in Food dye Adsorption Processes

Castro

Battocchio

Ribeiro

et al. 2023

Braz. arch. biol. technol.

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The aim of this study was to develop an adsorbent from coffee husk, residue from the coffee industry by different activation methods and to evaluate its application in the treatment of effluent containing synthetic Ponceau 4R dye. The activations were with phosphoric acid and zinc chloride, then the samples were characterized in terms of physical and chemical composition, structure and morphology, thermal behavior and kinetic and thermodynamic study. Regarding the characterization of the material, the activation with phosphoric acid showed porous morphology and a high surface area (429.7 m² g -1 ) and with the kinetic study it was possible to obtain an equilibrium time of 60 min and dispersion according to Elovich kinetics (R 2 = 0.96 and RMSE < 0.24). According to the experimental design, the adsorptive capacity can be evaluated with the significant result (qe = 19.87 mg g -1 ) under the conditions of 90 min of the adsorption process and at the concentration of 2 g L -1 of adsorbent. In relation to the equilibrium study the Langmuir model fit the data with coefficient of determination of R 2 = 0.84. Finally, the Ponceau 4R dye adsorption process using coffee husks as an activated carbon was thermodynamically favorable through the negative Gibbs free energy and positive entropy (+0.022 kJ mol -1 K -1 ). Therefore, the use of coffee husk as activated carbon proved to be a favorable material for Ponceau 4R dye adsorption. HIGHLIGHTS• The adsorbent activated with H2PO4 removed around 100% of Ponceau 4R dye.• The increase in temperature influenced the increase in maximum adsorptive capacity.• Langmuir's isotherm was better suited to the experimental data of the Ponceau 4R dye.

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Section: Graphical Abstractmentioning

confidence: 99%

Section: Graphical Abstractmentioning

confidence: 99%

Development of Adsorbent Materials Using Residue from Coffee Industry and Application in Food dye Adsorption Processes

Castro

Battocchio

Ribeiro

et al. 2023

Braz. arch. biol. technol.

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“…Overall, residual ashes contain the properties needed to be an effective adsorbent, such as a high concentration of minerals, particularly carbon, silicon, and aluminum, and high volatile content, which aids in the formation of a rich pore structure [13,14]. This indicates that the base material, a residue, can be easily converted into an adsorbent material, extremely efficient and low-cost [15]. This adsorbent material must be activated before its use and one of the methods is the chemical activation with nitric acid, phosphoric acid, potassium hydroxide, and/or potassium carbonate, or physical activation with steam, carbon dioxide, ozone, and other procedures and techniques can be used to activate carbon-based materials [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Production of nanostructured crystalline composite using residual ashes from flocculated sludge burning process in a poultry slaughterhouse wastewater treatment system

et al. 2022

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Nanostructured crystalline composite (activated carbon) was synthesized from residual ashes of the burning process of the sludge generated in the flotation step of a poultry slaughterhouse and was used for Allura red dye adsorption. The ashes were chemically activated using two types of reagents, H 2 O 2 and H 3 PO 4 , and the structure, morphology, and surface of the adsorbents were characterized by different techniques such as scanning electron microscopy with energy dispersive spectroscopy (SEM/ EDS), N 2 adsorption/desorption isotherms with Brunauer-Emmett-Teller (BET) method and Barret-Joyner-Hallenda (BJH) method, Fourier transform infrared spectroscopy (MID/FTIR), X-ray diffraction (XRD), and the point of zero charge (PZC). The adsorbent synthesized with H 3 PO 4 at 400 ºC displayed the best performance in removing dye molecules in 10 mg.L -1 solution, with a removal rate of approximately 100% when using a concentration of 2 g.L -1 in particle size of 0.42 mm. Besides that, the adsorbent synthesized with H 3 PO 4 had a particle diameter of approximately 15 Å, a size corresponding to the nanometer range, presented a crystallinity structure with well-defined phases such as quartz and the major elements in the composition were carbon and silicon. The surface area of the ashes enlarged from 14.71 to 448.1 m 2 .g -1 when H 3 PO 4 was used as an activator, producing a high-quality adsorbent, with an excellent cost-benefit, being it possible to be produced for a price of 9.35 USD.kg -1 , a price lower than the commercial activated carbon, making it a promising candidate for application in an industrial environment.

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“…Para a biomassa, é observada uma perda inicial de massa de cerca de 5,32% até 150 °C, enquanto para o hidrochar foi observada uma perda de massa de 5,88%. Nessa faixa, a perda de massa associada é decorrente da umidade do material (DE ARAÚJO et al, 2020;GUIMARÃES et al, 2020). Em um segundo momento, há perda de massa decorrente da liberação de material orgânico volátil até 250 °C (DE ARAÚJO et al, 2020;GUIMARÃES et al, 2020).…”

Section: Caracterização Do Hidrochar Otimizadounclassified

“…Nessa faixa, a perda de massa associada é decorrente da umidade do material (DE ARAÚJO et al, 2020;GUIMARÃES et al, 2020). Em um segundo momento, há perda de massa decorrente da liberação de material orgânico volátil até 250 °C (DE ARAÚJO et al, 2020;GUIMARÃES et al, 2020). Entre 500 -550 °C houve a maior perda de massa para ambos os materiais (entre 70 -80%).…”

Section: Caracterização Do Hidrochar Otimizadounclassified

Otimização multivariada da síntese one-pot de hidrochar ativado a partir de resíduo de bagaço de malte

Fontoura

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A indústria cervejeira é um setor em crescimento no país, o qual desponta como o terceiro maior produtor da bebida no mercado internacional. Um dos principais resíduos do processo é o bagaço de malte, tendo como destino principal a alimentação animal. Entretanto, fazem-se necessários novos processos a fim de valorizar essa biomassa, gerando materiais de maior valor agregado. Nesse contexto, o presente trabalho teve como objetivo obter materiais a partir do bagaço de malte utilizando a carbonização hidrotérmica com ativação ácida one-pot. A Matriz de Doehlert foi implementada avaliando a influência dos parâmetros temperatura (100, 125, 150, 175 e 200 °C) e tempo de residência (4, 14 e 24 h) no rendimento mássico e na capacidade de remoção do corante azul de metileno em solução aquosa. Os materiais obtidos foram caracterizados, a fim de contribuir com a discussão de suas propriedades físico-químicas. O hidrochar otimizado (150 °C, 14 h) apresentou uma área superficial baixa (aproximadamente 9 m2 g -1 ), porém a presença de grupos funcionais oxigenados na superfície do material auxilia em sua capacidade adsortiva. O modelo cinético de pseudo-segunda ordem e o modelo de isoterma de Freundlich ajustaram-se melhor dados experimentais. O equilíbrio de adsorção ocorreu em 8 h e a capacidade máxima de adsorção atingiu 134,78 mg g -1 de azul de metileno a 30 °C. Posteriormente, ainda por via HTC, foi avaliada a produção de um compósito de ferro suportado em hidrochar para aplicação em reação de foto-Fenton para degradação do corante alaranjado de metila. Estudos iniciais demonstraram a viabilidade do material para fotodegradação de poluentes. Ensaios com inibidores verificaram que as principais espécies envolvidas no processo são os radicais ·OH e ·O 2- . O pH inicial e a dose de H 2 O 2 otimizados para a reação foram determinados (pH 3 e C H2O2 = 20 mmol L -1 ). A carbonização hidrotérmica com ativação e funcionalização em uma única etapa se mostrou uma forma adequada para o tratamento do bagaço de malte, com vistas à aplicação do material como adsorvente e suporte de catalisador para degradação de poluentes orgânicos em água. Palavras-chave: Carbonização hidrotérmica. Síntese verde. Adsorção. Foto-Fenton. Corantes.

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Biochars obtained from arabica coffee husks by a pyrolysis process: characterization and application in Fe(ii) removal in aqueous systems

Abstract: In this work biochars were synthesized from arabica coffee husks and were used for Fe(ii) adsorption by a pyrolysis process at 350 and 600 °C.

Cited by 30 publications

References 61 publications

Development of Adsorbent Materials Using Residue from Coffee Industry and Application in Food dye Adsorption Processes

Development of Adsorbent Materials Using Residue from Coffee Industry and Application in Food dye Adsorption Processes

Production of nanostructured crystalline composite using residual ashes from flocculated sludge burning process in a poultry slaughterhouse wastewater treatment system

Otimização multivariada da síntese one-pot de hidrochar ativado a partir de resíduo de bagaço de malte

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