Highly Efficient Removal of Cu(II) Ions from Acidic Aqueous Solution Using ZnO Nanoparticles as Nano-Adsorbents
| Autor: | Eduardo Leiva, Carolina Rodríguez, Camila Tapia |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Aqueous solution
Water supply for domestic and industrial purposes Environmental remediation Geography Planning and Development chemistry.chemical_element Environmental pollution Hydraulic engineering Aquatic Science Biochemistry Copper Nanomaterials Adsorption chemistry adsorption copper Nano Water pollution TC1-978 TD201-500 zinc-oxide nanoparticles nanomaterials Water Science and Technology Nuclear chemistry acid mine drainage |
| Zdroj: | Water Volume 13 Issue 21 Water, Vol 13, Iss 2960, p 2960 (2021) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w13212960 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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