Abstract
The presence of heavy metal ions in water environments has raised significant concerns, necessitating practical solutions for their complete removal. In this study, a combination of adsorption and electrocoagulation (ADS + EC) techniques was introduced as an efficient approach for removing high concentrations of nickel ions (Ni2+) from aqueous solutions, employing low-cost sunflower seed shell biochar (SSSB). The combined techniques demonstrated superior removal efficiency compared to individual methods. The synthesized SSSB was characterized using SEM, FT-IR, XRD, N2-adsorption–desorption isotherms, XPS, and TEM. Batch processes were optimized by investigating pH, adsorbent dosage, initial nickel concentration, electrode effects, and current density. An aluminum (Al) electrode electrocoagulated particles and removed residual Ni2+ after adsorption. Kinetic and isotherm models examined Ni2+ adsorption and electrocoagulation coupling with SSSB-based adsorbent. The results indicated that the kinetic data fit well with a pseudo-second-order model, while the experimental equilibrium adsorption data conformed to a Langmuir isotherm under optimized conditions. The maximum adsorption capacity of the activated sunflower seed shell was determined to be 44.247 mg.g−1. The highest nickel ion removal efficiency of 99.98% was observed at initial pH values of 6.0 for ADS and 4.0 for ADS/EC; initial Ni2+ concentrations of 30.0 mg/L and 1.5 g/L of SSSB; initial current densities of 0.59 mA/cm2 and 1.32 kWh/m3 were also found to be optimal. The mechanisms involved in the removal of Ni2+ from wastewater were also examined in this research. These findings suggest that the adsorption-assisted electrocoagulation technique has a remarkable capacity for the cost-effective removal of heavy metals from various wastewater sources.
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Acknowledgements
This work was supported by the “National Natural Science Foundation of China and Science and Technology Department of Changchun City” Program, the State Key Laboratory of Environmental Geochemistry, and the Northeast Normal University.
CAS Key Laboratory of Urban Pollutant Conversion of Urban Environment, Institute of Urban Environment, Chinese Academy of Sciences.
We also acknowledge the ANSO Scholarship for Young Talents in China from the Chinese Academy of Sciences.
Funding
This research paper was financed by the “National Natural Science Foundation of China (NSFC: 41772236) and the Science” and “Technology Department of Changchun City (17SS027)”.
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Altogether authors contributed to the study's conception and design.
Conceptualization and writing—original draft preparation: [Jean Claude Nizeyimana].
Supervision and Resources: [Prof. Shanshan Lin, Prof. Chang-Ping Yu, and Prof. Anyi Hu].
Formal analysis and investigation: [Junaid Khan, Gratien Twagirayezu and Olivier Irumva].
Writing—review and editing: [Shanshan Lin] and [Pamphile Ndagijimana].
Data collection: [Jean Claude Nizeyimana], [Junaid Khan], [Liu Xiangru] and [Habasi Patrick Manzi]. All authors read and approved the final manuscript.
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Nizeyimana, J.C., Ndagijimana, P., Khan, J. et al. A hybrid system for Nickel ions removal from synthesized wastewater using adsorption assisted with electrocoagulation. Environ Sci Pollut Res 31, 28321–28340 (2024). https://doi.org/10.1007/s11356-024-33082-7
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DOI: https://doi.org/10.1007/s11356-024-33082-7