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Phenolic hydroxyl derived copper alginate microspheres as superior adsorbent for effective adsorption of tetracycline
- Zhang, Xiaonuo, Lin, Xiaoyan, He, Yu, Luo, Xuegang
- International journal of biological macromolecules 2019 v.136 pp. 445-459
- adsorbents, adsorption, alginates, analytical methods, aquatic environment, cations, copper, endothermy, gelation, hydrogen bonding, hydrophobic bonding, kinetics, microparticles, models, solidification, sorption isotherms, tannins, tetracycline, thermodynamics, water pollution
- Significant concerns had been given raise to the pollution of tetracycline in aquatic environment in recent years. In this study, a novel phenolic hydroxyl (bayberry tannin) functionalized copper alginate microspheres adsorbent for the adsorption of tetracycline from contaminated water environment had been synthesized by a facile gelation and solidification process. The structure and chemical properties were characterized by the various analytical methods. The as-prepared adsorbent displayed the excellent adsorption performance with the maximum adsorption capacity of 153.89 mg·g−1, and the equilibrium data were well fitted the Langmuir isotherm model and pseudo-second-order kinetic model. In addition, the thermodynamic values (ΔH0 > 0, ΔS0 > 0, ΔG0 < 0) demonstrated that the tetracycline adsorption process was feasible, endothermic and spontaneous in nature. The possible preparation and adsorption mechanisms of as-prepared adsorbent were the result of hydrogen bond, cation bonding bridge, n-π EDA interaction, hydrophobic interaction and π-π EDA interaction. Compared with other adsorbents, the as-prepared adsorbent could be considered a high performance and promising candidate for the effective removal of tetracycline from aquatic environment.