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- Title
Removal and mechanism of Ni(II)-containing wastewater by oxidation and Fe-impregnated modified biochar.
- Authors
Chaoyang Yu
- Abstract
In this paper, raw biochar (RB), oxidation biochar (OB), and Fe-impregnated biochar (MB) were prepared and used to remove Ni(II) from aqueous solutions. Batch adsorption experiments showed that the Ni(II) removal efficiency by RB, OB, and MB could be guaranteed to reach 80%, 91%, and 99%, respectively, in the pH range of 5~10, indicating that the materials have strong pH adaptability. The coexisting ions Na+, Ca2+, and Fe3+ had little effect on the Ni(II) removal, while Cd2+ and Pb2+ had an inhibitory effect on the Ni(II) removal. The Ni(II) removal process was following the pseudo-second-order model and Langmuir model. The Ni(II) maximum adsorption capacity by RB, OB, and MB was 62.20, 80.25, and 110.60 mg/g at 298 K, respectively. The Ni(II) removal efficiency on MB was still able to reach 100% in different water bodies. After 5 adsorption-desorption experiments, the Ni(II) removal efficiency by RB, OB, and MB remained around 51%, 70%, and 90%, respectively. Notable, co-precipitation, ion-exchange, electrostatic interaction, and complexation may exist in the mechanism of Ni(II) removal by biochar. This study shows that impregnated treated biochar has the potential and prospect for better treatment of Ni(II)-containing wastewater.
- Subjects
METHYLENE blue; BIOCHAR; LEAD removal (Sewage purification); SEWAGE; ADSORPTION capacity; ELECTROSTATIC interaction; BODIES of water
- Publication
Desalination & Water Treatment, 2022, Vol 254, p25
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28294