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http://hdl.handle.net/1843/57052| Type: | Artigo de Periódico |
| Title: | Reuse of iron ore tailings as an efficient adsorbent to remove dyes from aqueous solution |
| Authors: | Gustavo Alves Puiatti Eduarda Mara Elerate Jéssica Passos de Carvalho Vivian Andrade Luciano Ana Paula de Carvalho Teixeira Renata Pereira Lopes Antonio Teixeira de Matos |
| Abstract: | In this work, an iron ore tailings sample (IOT), collected from a tailings dam in Minas Gerais, Brazil, was characterized. The IOT presented point of zero charge of ∼ 6, specific surface area of 4 m2 g−1, and was mainly composed of hematite and quartz. Subsequently, experiments were performed to evaluate the adsorption of an anionic dye, Direct Red 80 (DR80), and a cationic dye, Methylene Blue (MB), by the IOT, studying the effects of its dose (doseIOT) and the solution initial pH (pH0). The DR80 removal increased with the decrease of the pH0 while the opposite effect occurred in the experiments with the MB, suggesting the process is governed by the adsorption resulting from electrostatic forces. The increase in the doseIOT increased the DR80 and MB removal, which can be attributed to the greater availability of adsorption sites. Pseudo-second order kinetic (R2 > 0.9994) and the Langmuir equilibrium isotherm (R2 > 0.9842) models described well the DR80 adsorption by the IOT, being the reaction rate and maximum adsorption capacity higher at lower pH0. In a regeneration experiment, it was possible to desorb almost entirely the DR80 using a NaOH solution. Additionally, the regenerated IOT was able to adsorb the DR80, demonstrating its reusability. In a preliminary assay, the IOT decreased the colour of the textile wastewater sample at pH0 3. Therefore, the results indicate the potential use of IOT for removing electric-charged pollutants by adsorption, especially anionic ones under acidic conditions. |
| Subject: | Resíduos Ferro - Minas e mineração Adsorção Água- Reutilização Refugos (Metalurgia) Poluentes orgânicos aquáticos |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE QUÍMICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1080/09593330.2021.2011427 |
| URI: | http://hdl.handle.net/1843/57052 |
| Issue Date: | 2021 |
| metadata.dc.url.externa: | https://www.tandfonline.com/doi/full/10.1080/09593330.2021.2011427 |
| metadata.dc.relation.ispartof: | Environmental Technology |
| Appears in Collections: | Artigo de Periódico |
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