Research on the adsorption behavior of acetamiprid on NKA-Ⅱ macroporous resin | 啶虫脒在NKA-Ⅱ大孔树脂上的吸附行为研究

Chinese. ［目的］ 为NKA-Ⅱ大孔吸附树脂在啶虫脒废水处理中的应用提供理论依据。［方法］ 通过静态吸附试验研究啶虫脒在NKA_Ⅱ大孔吸附树脂上的吸附特性。［结果］用Freundlich吸附等温线拟合所得的可决系数显著大于用Langrnuir吸附等温线拟合所得的可决系数，且均大于0.98，说明Freundlich吸附等温线可以很好地描述啶虫脒在树脂上的吸附行为。在试验温度范围内，啶虫脒在NKA-Ⅱ大孔树脂上的吸附量随温度的升高而增加。啶虫脒在NKA-Ⅱ大孔树脂上的吸附焓变为17.70 kJ/mol，NKA-Ⅱ大孔树脂吸附啶虫脒的主要作用力是氢键力，△G0的绝对值随温度的增加而增加。400 min后吸附达到动态平衡。啶虫脒在NKA-Ⅱ大孔树脂上的吸附过程符合准一级动力学方程。［结论］啶虫脒在NKA-Ⅱ大孔吸附树脂上的吸附过程为自发的吸热反应，符合Freundlich吸附等温线。_

English. ［Objective］ The research aimed to supply theoretical foundation for applying NKA-Ⅱ macroporous resin in processing acetamiprid wastewater. ［Method］ The adsorption characteristics of acetamiprid on NKA-Ⅱ macroporous resin were researched through static adsorption test. ［Result］The determination coefficient of fitting with Freundlich adsorption isotherm was significantly bigger that that of fitting with Langrnuir adsorption isotherm and both of them were bigger than 0.98, indicating that Freundlich adsorption isotherm could describe the adsorption behaviors of acetamiprid on resins very well. In the experimental temperature range, the adsorption amount of acetamiprid on NKA-Ⅱ macroporous resin was increased as the temperature was increased. The adsorption enthalpy increment of acetamiprid on NKA-Ⅱ macroporous resin was 17.70 kJ/mol . The major adsorption force between NKA-Ⅱ macroporous resin and acetamiprid was hydrogen bond force and the absolute value of △G0 was increased as the temperature was increased. The adsorption reached dynamic equilibrium after 400 min. The adsorption process of acetamiprid on NKA-Ⅱ macroporous resin accorded with pseudo-first-order kinetic equation. ［Conclusion］ The adsorption process of acetamiprid on NKA-Ⅱ macroporous resin was spontaneous endothermic reaction and accorded with Freundlich adsorption isotherm. _