Study on the Adsorption Behavior of Al-SBA-15 to Tetracycline in Water
In this study,M-SBA-15 mesoporous materials modified with metals such as Al,Fe,Cu and Mn were prepared and their adsorption performance on tetracycline were compared.SEM and N2 adsorption/desorption were used for Al-SBA-15 characterization.The effects of modification time,pH,temperature,mass concentration of tetracycline and other factors on adsorption behavior of Al-SBA-15 to tetracycline were investigated,and the kinetic models,isotherm models and thermodynamic models were used to analyze the adsorption behavior.The results show that Al-SBA-15 has the best adsorption effect on tetracycline,with optimal conditions being an N(Al)∶N(Si)ratio of 0.35,modification time of 3 h,pH of 6.0 and temperature of 298 K.The pseudo-second-order kinetic model is more suitable for describing the adsorption kinetics of Al-SBA-15,and the intra-particle diffusion is not the only rate-determination step.Freundlich model better describes the adsorption behavior of Al-SBA-15 on tetracycline,indicating that the process is mainly a multi-layer adsorption.Thermodynamic analysis shows that the adsorption of Al-SBA-15 is spontaneous and exothermic,and results in decreased disorder.
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