Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. Strains
Rare earth elements such as neodymium (Nd) are important elements used mainly in developing new technologies. Although they are found in low concentrations in nature, they can be obtained by extracting solid samples such as phosphogypsum. Among the techniques, adsorption has been used successfully w...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/21/4585 |
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| author | Éder C. Lima Diana Pinto Matias Schadeck Netto Glaydson S. Dos Reis Luis F. O. Silva Guilherme L. Dotto |
| author_facet | Éder C. Lima Diana Pinto Matias Schadeck Netto Glaydson S. Dos Reis Luis F. O. Silva Guilherme L. Dotto |
| author_sort | Éder C. Lima |
| collection | DOAJ |
| description | Rare earth elements such as neodymium (Nd) are important elements used mainly in developing new technologies. Although they are found in low concentrations in nature, they can be obtained by extracting solid samples such as phosphogypsum. Among the techniques, adsorption has been used successfully with several adsorbent materials. In this work, two strains of <i>Spirulina platensis</i> (LEB-18 and LEB-52) were employed as biosorbents for efficiently removing the Nd element from the aqueous media. Biosorption tests were carried out in a batch system, and the results of the biosorption kinetics showed that for both materials, the biosorption of Nd was better described by the Avrami model. Moreover, it could be considered that 80 min would be necessary to attain the equilibrium of Nd(III) using both biosorbents. The result of the biosorption isotherms showed that for both strains, the best-fitted model was the Liu model, having a maximum biosorption capacity of 72.5 mg g<sup>−1</sup> for LEB-18 and 48.2 mg g<sup>−1</sup> for LEB-52 at a temperature of 298 K. Thermodynamics of adsorption showed that for both LEB-18 and LEB-52 the process was favorable (∆G° < 0) and exothermic (∆H° −23.2 for LEB-18 and ∆H° −19.9 for LEB-52). Finally, both strains were suitable to uptake Nd, and the better result of LEB-18 could be attributed to the high amount of P and S groups in this biomass. Based on the results, a mechanism of electrostatic attraction of Nd<sup>3+</sup> and phosphate and sulfate groups of both strains of <i>Spirulina platensis</i> was proposed. |
| first_indexed | 2024-03-09T18:42:56Z |
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| id | doaj.art-54d0af8266ee44478763de2e019edb48 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T18:42:56Z |
| publishDate | 2022-10-01 |
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| record_format | Article |
| series | Polymers |
| spelling | doaj.art-54d0af8266ee44478763de2e019edb482023-11-24T06:28:36ZengMDPI AGPolymers2073-43602022-10-011421458510.3390/polym14214585Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. StrainsÉder C. Lima0Diana Pinto1Matias Schadeck Netto2Glaydson S. Dos Reis3Luis F. O. Silva4Guilherme L. Dotto5Institute of Chemistry, Federal University of Rio Grande do Sul, Porto Alegre 90040-060, BrazilDepartment of Civil and Environmental, Universidad De La Costa, Calle 58 # 55-66, Barranquilla 080002, ColombiaResearch Group on Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Santa Maria 97105-900, BrazilDepartment of Forest Biomaterials and Technology, Biomass Technology Centre, Swedish University of Agricultural Sciences, SE-901 83 Umeå, SwedenDepartment of Civil and Environmental, Universidad De La Costa, Calle 58 # 55-66, Barranquilla 080002, ColombiaResearch Group on Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Santa Maria 97105-900, BrazilRare earth elements such as neodymium (Nd) are important elements used mainly in developing new technologies. Although they are found in low concentrations in nature, they can be obtained by extracting solid samples such as phosphogypsum. Among the techniques, adsorption has been used successfully with several adsorbent materials. In this work, two strains of <i>Spirulina platensis</i> (LEB-18 and LEB-52) were employed as biosorbents for efficiently removing the Nd element from the aqueous media. Biosorption tests were carried out in a batch system, and the results of the biosorption kinetics showed that for both materials, the biosorption of Nd was better described by the Avrami model. Moreover, it could be considered that 80 min would be necessary to attain the equilibrium of Nd(III) using both biosorbents. The result of the biosorption isotherms showed that for both strains, the best-fitted model was the Liu model, having a maximum biosorption capacity of 72.5 mg g<sup>−1</sup> for LEB-18 and 48.2 mg g<sup>−1</sup> for LEB-52 at a temperature of 298 K. Thermodynamics of adsorption showed that for both LEB-18 and LEB-52 the process was favorable (∆G° < 0) and exothermic (∆H° −23.2 for LEB-18 and ∆H° −19.9 for LEB-52). Finally, both strains were suitable to uptake Nd, and the better result of LEB-18 could be attributed to the high amount of P and S groups in this biomass. Based on the results, a mechanism of electrostatic attraction of Nd<sup>3+</sup> and phosphate and sulfate groups of both strains of <i>Spirulina platensis</i> was proposed.https://www.mdpi.com/2073-4360/14/21/4585biomass<i>Spirulina</i>rare earth elementskineticsisotherms |
| spellingShingle | Éder C. Lima Diana Pinto Matias Schadeck Netto Glaydson S. Dos Reis Luis F. O. Silva Guilherme L. Dotto Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. Strains Polymers biomass <i>Spirulina</i> rare earth elements kinetics isotherms |
| title | Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. Strains |
| title_full | Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. Strains |
| title_fullStr | Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. Strains |
| title_full_unstemmed | Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. Strains |
| title_short | Biosorption of Neodymium (Nd) from Aqueous Solutions Using <em>Spirulina platensis</em> sp. Strains |
| title_sort | biosorption of neodymium nd from aqueous solutions using em spirulina platensis em sp strains |
| topic | biomass <i>Spirulina</i> rare earth elements kinetics isotherms |
| url | https://www.mdpi.com/2073-4360/14/21/4585 |
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