| Title | CNT grown in situ from iron ore tailings: simple dispersion and environmental sustainability |
|---|---|
| ID_Doc | 24734 |
| Authors | Costal, GZ; Calderón-Morales, BRD; Carvalho, JDL; da Silva, EE; de Morais, EA; Machado, LF; Oliveira, CAD; Moura, F; Geraldo, V |
| Title | CNT grown in situ from iron ore tailings: simple dispersion and environmental sustainability |
| Year | 2023 |
| Published | Journal Of Nanoparticle Research, 25, 10 |
| Abstract | Applications for carbon nanotubes (CNT) and the reuse of iron ore tailings (IOT) have been explored in the literature about nanostructured cementitious materials. Reinforced iron ore tailings (R-IOT) was produced growing CNT from an external catalyst directly on particles of IOT, regardless of its iron content. In this work, analyses by infrared spectroscopy detail the chemical bonds between IOT grains and the external catalyst. Also, different in situ CNT concentrations (0.05%, 0.2%, and 0.8%) in R-IOT were used for preparing a mortar which 25% of its aggregate's composition is reused IOT. R-IOT increased flexural strength (up to 29% with 0.8% CNT) and delivered better reinforcement efficiency (up to 60%) when compared to functionalized CNT. The electrical conductivity of the nanostructured composites was also higher (up to 370%) when compared nanostructured mortar to the mortar prepared from plain IOT. Contrary to the chemical CNT functionalization process to dispersion, the use of R-IOT to produce mortar is an easy and simple process that does not require additives, admixtures, surfactants, or any other additional chemical procedure. In terms of circular economy, the process combines innovation and sustainability since it reinserts IOT in the productive flow, representing an efficient application for this residue of mining activities. |
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