电气石对恩诺沙星的吸附特性

采用天然铁电气石作为吸附剂去除水中的恩诺沙星，考察了pH值、干扰离子对吸附性能的影响，并探讨了吸附热力学及动力学特性。结果表明：pH为5的条件下，吸附量最大，为7.13 mg·g-1；ΔG H > 0表明吸附是自发进行的吸热反应，ΔH=2.048 kJ·mol-1（-1）说明吸附为物理吸附。等温吸附曲线拟合中，Freundlich模型拟合效果较好。电气石对恩诺沙星的吸附过程符合拟二级动力学。脱附实验表明，电气石具有较好的脱附再生性能，脱附率可达99%。初始pH为5时， 较高浓度的Cu2+和Zn2+对恩诺沙星的吸附均有抑制作用，Cu2+的抑制作用明显高于Zn2+，且干扰离子浓度越高抑制作用越强；pH为7时，低浓度的干扰离子能够促进恩诺沙星的吸附。

Adsorption characteristics of enrofloxacin by schorl

Schorl was used as the adsorbent for enrofloxacin removal from water. The effects of pH and interfering ions on the adsorption were investigated. In addition, the thermodynamics and kinetics characteristics of the adsorption were discussed. The results demonstrated that when the initial pH was 5, the maximum adsorption capacity was 7.13 mg·g-1. The negative ΔG value and positive ΔH value indicated that the adsorption process was spontaneous and endothermic. ΔH was equal to 2.048 kJ·mol-1 (-1), indicative of physical adsorption. The Freundlich and pseudo-second order kinetic models could well describe the experimental data, indicating that schorl had a good desorption and regeneration performance. The desorption rate reached 99%. When the initial pH was 5, the presence of Cu2+ and Zn2+ had a negative effect on the enrofloxacin adsorption, and the inhibition from Cu2+ was significantly higher than that due to Zn2+. The higher ion concentration resulted in stronger inhibition. When the pH was 7, interfering ions at low concentration could promote the enrofloxacin adsorption.