Carbon Nanomaterials for Environmental Applications

Machado, Fernando Machado; Lima, Éder C.; Jauris, Iuri Medeiros; Adebayo, Matthew A.

doi:10.1007/978-3-319-18875-1_5

Cited by 8 publications

(3 citation statements)

References 66 publications

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“…The models tested were Langmuir, Freundlich, Langmuir-Freundlich and Temkin [25] since they are the models most often mentioned in the literature to describe adsorption processes in liquid phase. Langmuir model was used to establish the maximum adsorption capacity of the adsorbent (q m ) since this model assumes that a monolayer is formed over the surface of the adsorbent material when it gets saturated [26].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Cu(II) adsorption from aqueous solutions using the inner and outer portions of sugarcane bagasse

et al. 2018

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In the present work, the adsorption capacity of internal and external portions of treated sugarcane bagasse (SCB) to remove Cu(II) from aqueous solution was evaluated. In order to reuse this solid waste as an effective adsorption material, both portions were treated with three different solutions (hot water, ethanol and NaOH) to remove sugar, external gummy tissue and impurities. Adsorption experiments were carried out in a batch system at room temperature. The kinetic data were fitted to pseudo-second order and Elovich models for the internal portion, and to the Elovich model for the external portion reaching equilibrium times from 8 to 24 h. Freundlich and Langmuir-Freundlich models described well the adsorption behavior of all systems. The compositional differences of the two portions of SCB and the surface chemistry were analyzed. Material characterization by scanning electron microscopy, Fourier transformed infrared spectroscopy, and X-ray photoelectron spectroscopy demonstrated morphologic and chemical modifications of the material after each treatment. Results showed that external SCB treated with a sodium hydroxide solution and internal SCB treated with ethanol solution were the best adsorbent materials, and provided a surface with more affinity to remove Cu(II).

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Section: Adsorption Isothermsmentioning

confidence: 99%

Cu(II) adsorption from aqueous solutions using the inner and outer portions of sugarcane bagasse

et al. 2018

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“…Para um processo de adsorção eficiente, a escolha do adsorvente é primordial Bergmann, 2015). O carvão ativado (CA) é reconhecido como um adsorvente superior (devido à sua alta porosidade e área de superfície), amplamente aplicado no tratamento de efluentes industriais (Wu et al, 2021).…”

Section: Introductionunclassified

Adsorvente preparado a partir da biomassa de casca de camarão para remoção de contaminantes ambientais

Medran Rangel,

Machado Machado

2024

PERSP

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A técnica de adsorção é um método eficiente de tratamento de efluentes e águas, porém a escolha do adsorvente é primordial devido ao alto custo das matérias-primas, que pode tornar o tratamento caro. Recentemente, biomassas advindas de processos agroindustriais são consideradas alternativas interessantes para produção de adsorventes, seja somente o material ou como carvão ativado, devido ao baixo custo e ampla disponibilidade. Nessa esteira, a casca de camarão surge como uma interessante biomassa para produção de adsorvente. Com base na demanda de consumo, grandes quantidades de resíduos de marisco são geradas pela carcinicultura e indústrias de processamento, podendo causar poluição ambiental. O objetivo desta pesquisa é apresentar o que existe na literatura sobre a preparação de adsorventes a partir da biomassa de camarão, bem como a aplicação desse como adsorvente na descontaminação de águas com contaminantes. A metodologia desta pesquisa bibliográfica utilizou mecanismos de busca como Science Direct, Google acadêmico e Pubmed e após refinando os artigos encontrados de acordo com o objetivo. Como resultados foi possível constatar que o exoesqueleto do camarão é um material que, devido à presença de quitina em sua estrutura, funciona como precursor na obtenção do carvão ativado

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“…Carbon materials are commonly used as adsorbents for water purification from diverse types of contamination [ 27 , 28 ]. As recently shown, CNFs produced via the catalytic decomposition of DCE demonstrate very high efficiency in adsorption of chloroaromatic pollutants from water [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Chlorine- and Nitrogen-Containing Carbon Nanofibers for Water Purification from Chloroaromatic Compounds

et al. 2022

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Chlorine- and nitrogen-containing carbon nanofibers (CNFs) were obtained by combined catalytic pyrolysis of trichloroethylene (C2HCl3) and acetonitrile (CH3CN). Their efficiency in the adsorption of 1,2-dichlorobenzene (1,2-DCB) from water has been studied. The synthesis of CNFs was carried out over self-dispersing nickel catalyst at 600 °C. The produced CNFs possess a well-defined segmented structure, high specific surface area (~300 m2/g) and high porosity (0.5–0.7 cm3/g). The addition of CH3CN into the reaction mixture allows the introduction of nitrogen into the CNF structure and increases the volume of mesopores. As a result, the capacity of CNF towards adsorption of 1,2-DCB from its aqueous solution increased from 0.41 to 0.57 cm3/g. Regardless of the presence of N, the CNF samples exhibited a degree of 1,2-DCB adsorption from water–organic emulsion exceeding 90%. The adsorption process was shown to be well described by the Dubinin–Astakhov equation. The regeneration of the used CNF adsorbent through liquid-phase hydrodechlorination was also investigated. For this purpose, Pd nanoparticles (1.5 wt%) were deposited on the CNF surface to form the adsorbent with catalytic function. The presence of palladium was found to have a slight effect on the adsorption capacity of CNF. Further regeneration of the adsorbent-catalyst via hydrodechlorination of adsorbed 1,2-DCB was completed within 1 h with 100% conversion. The repeated use of regenerated adsorbent-catalysts for purification of solutions after the first cycle of adsorption ensures almost complete removal of 1,2-DCB.

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Carbon Nanomaterials for Environmental Applications

Cited by 8 publications

References 66 publications

Cu(II) adsorption from aqueous solutions using the inner and outer portions of sugarcane bagasse

Cu(II) adsorption from aqueous solutions using the inner and outer portions of sugarcane bagasse

Adsorvente preparado a partir da biomassa de casca de camarão para remoção de contaminantes ambientais

Synthesis of Chlorine- and Nitrogen-Containing Carbon Nanofibers for Water Purification from Chloroaromatic Compounds

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