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Highly efficient removal of amoxicillin from water by Mg-Al layered double hydroxide/cellulose nanocomposite beads synthesized through in-situ coprecipitation method

Yang, Cong, Wang, Langrun, Yu, Yuqing, Wu, Peng, Wang, Fen, Liu, Shilin, Luo, Xiaogang
International journal of biological macromolecules 2020 v.149 pp. 93-100
Fourier transform infrared spectroscopy, X-radiation, X-ray diffraction, X-ray photoelectron spectroscopy, adsorbents, adsorption, aluminum, amoxicillin, antibiotic residues, cellulose, coprecipitation, electrostatic interactions, energy, kinetics, magnesium, models, nanocomposites, pH, porosity, public water supply, scanning electron microscopy, sorption isotherms, surface area, toxicity, water content, water pollution, water purification, zeta potential
Amoxicillin in the municipal water system needs to be removed due to the toxicity towards creatures. In this work, Mg-Al LDH/cellulose nanocomposite beads (LDH@CB) were synthesized by an in situ coprecipitation procedure and were used as novel adsorbents for amoxicillin removal in the aqueous phase. Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), The specific surface area test (BET), scanning electron microscopy (SEM), ζ potential, X-ray electron energy (XPS) were employed to confirm the success load of LDH onto CB. The large specific surface area (76.46 m² g⁻¹), high water content (92.05%) and high porosity (94.75%) of LDH@CB made the adsorbent suitable in water treatment. The adsorption process was kinetically fitted with the pseudo second-order kinetic model while isothermally fitted with the Freundlich isotherm model. It was found that the maximum adsorption capacity of LDH@CB qₘ was 138.3 mg g⁻¹. Meanwhile, the results from XPS and ζ potentials revealed the AMX removal mechanism: Under natural pH conditions, AMX was negatively charged and LDH@CB was positively charged, the contaminant and the adsorbent were linked by electrostatic interaction through OCO⋯M (Mg/Al). These results showed that the adsorbent design method had a wide application prospect in the water purification field.