Abstract
The current study involves the removal of Pb(II) ions from an aqueous solution using GO/Mn-Fe hybrids in a fixed bed column study. The capability of the hybrid in the Pb removal was examined using a continuous flow fixed bed column which revealed that the hybrid had the maximum adsorption capacity of 172.768 mg/g at a flow rate of 2 mL/min, bed height of 1 cm, and influent concentration of 200 mg/L. The breakthrough curves obtained from the experiments were examined using three different models, i.e., Bohart-Adams model, Thomas Model, and Yoon-Nelson model, wherein all the models showed high correlation coefficient values. Three consecutive adsorption–desorption cycles in the column yielded regeneration efficiencies of 91.71%, 88.31%, and 85.41%. The column life factor indicated that the fixed bed would have enough capacity to avoid a zero breakthrough time for up to 9 cycles, implying that GO/Mn-Fe could be used as a cheap and efficient adsorbent in the removal of Pb(II) from contaminated water. The adsorption mechanism was postulated based on the characterization of the spent adsorbent by FTIR and SEM. The phenomenon of the adsorption process can be described in accordance with the surface complex formation theory, which suggests that an increase in pH decreases the competition between metal ions and protons, favoring metal ion adsorption. The toxicity of the synthesized hybrid was evaluated on HeLa cells and compared to the toxicity of GO. Increasing the concentration of GO/Mn-Fe hybrid from 50 to 250 g/mL resulted in a decrease in cell viability from 91.90 to 56.52%, whereas increasing the concentration of GO resulted in a decrease in cell viability from 61.59 to 37.19%. The study clearly demonstrates the use of GO/Mn-Fe hybrid as an adsorbent for efficient sequestration of Pb(II) ions with lower environmental toxicity.
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The datasets used and/or analyzed during the current study are available within the submitted manuscript.
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Funding
All authors thank the School of Environmental Science and Engineering, Department of Civil Engineering and CRF IIT Kharagpur, for providing the infrastructure and instrumentation facilities. S Raj, H Singh, and A Hansda would like to acknowledge the MHRD, New Delhi, for providing financial assistance during the course of this work.
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Sankalp Raj: conceptualization, methodology, software, data analysis, writing – original draft, investigation.
Hemant Singh: data analysis, assistance to the investigation.
Arman Hansda: writing – original draft, data analysis, assistance to the investigation.
Ritobrata Goswami: supervision, writing – review and editing.
Jayanta Bhattacharya: supervision, writing – review and editing.
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Raj, S., Singh, H., Hansda, A.K. et al. Performance and cell toxicity studies for the use of graphene oxide-bimetallic oxide hybrids in the absorptive removal of Pb(II) from wastewater: fixed-bed column study with regeneration. Environ Sci Pollut Res 30, 124950–124963 (2023). https://doi.org/10.1007/s11356-023-25825-9
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DOI: https://doi.org/10.1007/s11356-023-25825-9