Abstract
The sludge biochar loaded with layered double hydroxides (CoFe-LDH@SBC) was used as a composite adsorbent for removing low concentrated ciprofloxacin (CIP) effectively in water environment. The sludge biochar (SBC) and CoFe-LDH@SBC were synthesized by pyrolysis and self-assembly; and the characterization of SBC and the composite material were analyzed through a series of analytical methods including scanning electron microscopy-Energy Dispersive Spectrometer, X-ray diffraction, Fourier transform infrared, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller, and Zeta potential. Due to various chemisorptions, CoFe-LDH@SBC showed superior adsorption performance for CIP with 14 mg/g, which was 2.8 times of that for SBC. Moreover, Artificial Neural Network (ANN) model was employed to predict the adsorption capacity and removal rate of CIP using experimental data obtained. Furthermore, according to density functional theory (DFT), parallel adsorption was proved to be dominant in the adsorption process, which indicated that the adsorption was a favorable and exothermic chemisorptions process.
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