Nanocomposites of zero-valent Iron@Activated carbon derived from corn stalk for adsorptive removal of tetracycline antibiotics
2020
Song, Yue-Xian | Chen, Su | You, Nan | Fan, Hong-Tao | Sun, Li-Na
The hybrid nanocomposites of zero-valent iron loaded the activated carbon derived from the corn stalk (ZVI@ACCS) was prepared and used to remove the antibiotics of tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC) from aqueous solution. The adsorption amounts of three antibiotics (103.1 mg g⁻¹ for CTC, 72.9 mg g⁻¹ for OTC and 81.5 mg g⁻¹ for TC) were sensitive to the temperature and independent of pH in the range of 4.2–7.1 at 298 K through the synergistic interactions of the electrostatic attraction, the bridging complexation and the surface complexation. The equilibrium was performed within 20 min at 298 K. The spontaneous (ΔGᵒ<0) and endothermic (ΔHᵒ>0) adsorption of three antibiotics onto the ZVI@ACCS nanocomposites gave a better matching (r² > 0.99) with Langmuir and pseudo-second-order models.
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