Abstract
The adsorption of ceftriaxone (CET) and doxycycline (DOX) from aqueous solution using ferrihydrite/plant-based composites (silica rice husk) to reduce their negative impact on the ecosystem was adequately studied. On the other hand, phosphate and humic acid are often found in water and soil; in view of this, their effects on the adsorption of CET and DOX were investigated. The results showed that the removal of ceftriaxone decreased with an increase in pH, while that of doxycycline did not. Ferrihydrite with 10% silica rice husk (Fh-10%SRH) has the highest maximum adsorption capacity of 139 and 178 mg g−1 for CET and DOX, respectively, at room temperature based on Liu’s adsorption isotherm. This implies that the presence of silica rice husk increases CET and DOX uptake due to an increase in the pore volume of FH-10%SRH. The results showed that phosphate had a significant inhibition role on CET adsorption and minor on DOX, whereas humic acid salt affected neither case. Increase in temperature up to 333 K favored the adsorption of both contaminants. The proposed adsorption mechanisms of ceftriaxone are electrostatic interaction, n-π interaction, and hydrogen bond, while that of DOX entails n-π interaction and hydrogen bond.
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The datasets of the current study are available from the corresponding author on reasonable request.
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The authors acknowledge the Center of Microscopy at UFMG for the infrastructure and FAPEMIG/Renovamin (Brazilian agency) for the financial support. The authors would like to thank Taiane G.F. Souza for her efforts in carrying out some of the analysis.
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S.J.O: Conceptualization; methodology; formal analysis; validation; investigation; data curation; writing, original draft; writing, review and editing. N.D.S.M: Funding acquisition, supervision, writing — review and editing. V.S.T. C: Validation, supervision, resources, funding acquisition, writing — review and editing.
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Olusegun, S.J., Mohallem, N.D.S. & Ciminelli, V.S.T. Reducing the negative impact of ceftriaxone and doxycycline in aqueous solutions using ferrihydrite/plant-based composites: mechanism pathway. Environ Sci Pollut Res 29, 66547–66561 (2022). https://doi.org/10.1007/s11356-022-20561-y
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DOI: https://doi.org/10.1007/s11356-022-20561-y