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Article

Highly Efficient Removal of Cu(II) Ions from Acidic Aqueous Solution Using ZnO Nanoparticles as Nano-Adsorbents

1
Departamento de Química Inorgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile
2
Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile
3
Departamento de Química, Facultad de Ciencias, Universidad de Chile, Ñuñoa 7800003, Chile
*
Author to whom correspondence should be addressed.
Academic Editors: Cristina Palet and Julio Bastos-Arrieta
Water 2021, 13(21), 2960; https://doi.org/10.3390/w13212960
Received: 5 September 2021 / Revised: 8 October 2021 / Accepted: 14 October 2021 / Published: 20 October 2021
Water pollution by heavy metals has significant effects on aquatic ecosystems. Copper is one of the heavy metals that can cause environmental pollution and toxic effects in natural waters. This encourages the development of better technological alternatives for the removal of this pollutant. This work explores the application of ZnO nanoparticles (ZnO-NPs) for the removal of Cu(II) ions from acidic waters. ZnO NPs were characterized and adsorption experiments were performed under different acidic pHs to evaluate the removal of Cu(II) ions with ZnO NPs. The ZnO NPs were chemically stable under acidic conditions. The adsorption capacity of ZnO NPs for Cu(II) was up to 47.5 and 40.2 mg·g−1 at pH 4.8 and pH 4.0, respectively. The results revealed that qmax (47.5 mg·g−1) and maximum removal efficiency of Cu(II) (98.4%) are achieved at pH = 4.8. In addition, the surface roughness of ZnO NPs decreases approximately 70% after adsorption of Cu(II) at pH 4. The Cu(II) adsorption behavior was more adequately explained by Temkin isotherm model. Additionally, adsorption kinetics were efficiently explained with the pseudo-second-order kinetic model. These results show that ZnO NPs can be an efficient alternative for the removal of Cu(II) from acidic waters and the adsorption process was more efficient under pH = 4.8. This study provides new information about the potential application of ZnO NPs as an effective adsorbent for the remediation and treatment of acidic waters contaminated with Cu(II). View Full-Text
Keywords: adsorption; copper; zinc-oxide nanoparticles; nanomaterials; acid mine drainage adsorption; copper; zinc-oxide nanoparticles; nanomaterials; acid mine drainage
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MDPI and ACS Style

Leiva, E.; Tapia, C.; Rodríguez, C. Highly Efficient Removal of Cu(II) Ions from Acidic Aqueous Solution Using ZnO Nanoparticles as Nano-Adsorbents. Water 2021, 13, 2960. https://doi.org/10.3390/w13212960

AMA Style

Leiva E, Tapia C, Rodríguez C. Highly Efficient Removal of Cu(II) Ions from Acidic Aqueous Solution Using ZnO Nanoparticles as Nano-Adsorbents. Water. 2021; 13(21):2960. https://doi.org/10.3390/w13212960

Chicago/Turabian Style

Leiva, Eduardo, Camila Tapia, and Carolina Rodríguez. 2021. "Highly Efficient Removal of Cu(II) Ions from Acidic Aqueous Solution Using ZnO Nanoparticles as Nano-Adsorbents" Water 13, no. 21: 2960. https://doi.org/10.3390/w13212960

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