Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell Nanoparticles
This work focuses on the influence of temperature on Cr(VI) adsorption by nanoadsorbents based on core-shell bimagnetic CoFe2O4@g-Fe2O3 nanoparticles. The nanoadsorbents were synthesized using the hydrothermal coprecipitation method in alkaline medium followed by a surface treatment with Fe(NO3)3. T...
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| Format: | Article |
| Language: | English |
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Universidade Federal de Mato Grosso do Sul
2019-04-01
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| Series: | Orbital: The Electronic Journal of Chemistry |
| Subjects: | |
| Online Access: | https://periodicos.ufms.br/index.php/orbital/article/view/15990 |
| _version_ | 1797946846841143296 |
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| author | Alex Fabiano Cortez Campos Fabiana Narciso da Silva Marcelo Rubens Braga de Almeida Luana Cristina Alves Sales Paulo Henrique Michels-Brito Helena Augusta Lisboa de Oliveira |
| author_facet | Alex Fabiano Cortez Campos Fabiana Narciso da Silva Marcelo Rubens Braga de Almeida Luana Cristina Alves Sales Paulo Henrique Michels-Brito Helena Augusta Lisboa de Oliveira |
| author_sort | Alex Fabiano Cortez Campos |
| collection | DOAJ |
| description | This work focuses on the influence of temperature on Cr(VI) adsorption by nanoadsorbents based on core-shell bimagnetic CoFe2O4@g-Fe2O3 nanoparticles. The nanoadsorbents were synthesized using the hydrothermal coprecipitation method in alkaline medium followed by a surface treatment with Fe(NO3)3. The effect of initial chromium concentration and temperature of adsorption were evaluated from batch studies using 0.7 g/L of the nanoadsorbents. The results were analyzed in the framework of the Langmuir and Freundlich models and showed that the nanoadsorbents removed more than 95% of Cr(VI) in pH = 2.5 for a contact time of 30 min. The thermodynamics of the adsorption process was investigated by means of calculation of the Gibbs free energy, enthalpy and entropy changes. The results revealed that the Cr(VI) adsorption process is spontaneous, endothermic and presents an increase in randomness at the solid-solution interface.
DOI: http://dx.doi.org/10.17807/orbital.v11i2.1331
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| first_indexed | 2024-04-10T21:17:30Z |
| format | Article |
| id | doaj.art-7a8692ade32e45fd848d571c532051cc |
| institution | Directory Open Access Journal |
| issn | 1984-6428 |
| language | English |
| last_indexed | 2024-04-10T21:17:30Z |
| publishDate | 2019-04-01 |
| publisher | Universidade Federal de Mato Grosso do Sul |
| record_format | Article |
| series | Orbital: The Electronic Journal of Chemistry |
| spelling | doaj.art-7a8692ade32e45fd848d571c532051cc2023-01-20T10:53:14ZengUniversidade Federal de Mato Grosso do SulOrbital: The Electronic Journal of Chemistry1984-64282019-04-01112Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell NanoparticlesAlex Fabiano Cortez Campos0Fabiana Narciso da Silva1Marcelo Rubens Braga de Almeida2Luana Cristina Alves Sales3Paulo Henrique Michels-Brito4Helena Augusta Lisboa de Oliveira5Universidade de Brasília - UnBUniversidade de Brasília - UnBUniversidade de Brasília - UnBUniversidade de Brasília - UnBUniversidade de Brasília - UnBUniversidade de Brasília - UnBThis work focuses on the influence of temperature on Cr(VI) adsorption by nanoadsorbents based on core-shell bimagnetic CoFe2O4@g-Fe2O3 nanoparticles. The nanoadsorbents were synthesized using the hydrothermal coprecipitation method in alkaline medium followed by a surface treatment with Fe(NO3)3. The effect of initial chromium concentration and temperature of adsorption were evaluated from batch studies using 0.7 g/L of the nanoadsorbents. The results were analyzed in the framework of the Langmuir and Freundlich models and showed that the nanoadsorbents removed more than 95% of Cr(VI) in pH = 2.5 for a contact time of 30 min. The thermodynamics of the adsorption process was investigated by means of calculation of the Gibbs free energy, enthalpy and entropy changes. The results revealed that the Cr(VI) adsorption process is spontaneous, endothermic and presents an increase in randomness at the solid-solution interface. DOI: http://dx.doi.org/10.17807/orbital.v11i2.1331 https://periodicos.ufms.br/index.php/orbital/article/view/15990Cr(VI) adsorptionmagnetic nanoadsorbentsthermodynamic parameters |
| spellingShingle | Alex Fabiano Cortez Campos Fabiana Narciso da Silva Marcelo Rubens Braga de Almeida Luana Cristina Alves Sales Paulo Henrique Michels-Brito Helena Augusta Lisboa de Oliveira Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell Nanoparticles Orbital: The Electronic Journal of Chemistry Cr(VI) adsorption magnetic nanoadsorbents thermodynamic parameters |
| title | Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell Nanoparticles |
| title_full | Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell Nanoparticles |
| title_fullStr | Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell Nanoparticles |
| title_full_unstemmed | Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell Nanoparticles |
| title_short | Thermodynamics of Cr(VI) Adsorption on Magnetic Core-Shell Nanoparticles |
| title_sort | thermodynamics of cr vi adsorption on magnetic core shell nanoparticles |
| topic | Cr(VI) adsorption magnetic nanoadsorbents thermodynamic parameters |
| url | https://periodicos.ufms.br/index.php/orbital/article/view/15990 |
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