为了对比大孔型弱酸性树脂D113和凝胶型强酸性树脂001×7对水中氨氮的吸附性能, 该文通过静态实验进行了研究, 并从热力学和动力学角度对吸附过程进行了分析。实验结果表明: 对2种树脂, 随着树脂投加量增加, 对氨氮去除率增加, 吸附速率下降; 碱性条件下, 对氨氮有良好的去除率; 提高反应温度, 能促进氨氮去除率。2种树脂对氨氮的吸附符合Langmuir交换吸附等温线, D113树脂的最大吸附容量大于001×7树脂的最大吸附容量, 对氨氮的吸附是自发过程, 属于吸热反应, 同时伴随着熵增现象。2种树脂对氨氮吸附过程符合准二级动力学过程。在相同反应条件下, 001×7树脂吸附速率更快, 而D113树脂吸附氨氮需要的能量更少。
Abstract
The adsorption of ammonia-nitrogen on a macro-reticular weak acid resin (D113) with a strong acid resin (001×7) was analyzed experimentally to identify the thermodynamics and kinetics of the absorption process. The result showed that: 1) increasing resin concentrations increased the ammonia removals of the two resins even though the adsorption rate decreased; 2) a basic solution increased the adsorption capacity of the two resins, and 3) the adsorption capacity of the two resins increased with temperature. The adsorption isotherm of two resin combination was fit with the Langmuir adsorption model with the kinetics close a pseudo-second equation. The process of ammonia adsorption on the resins was a spontaneous, endothermic reaction with increasing entropy.
关键词
离子交换树脂 /
氨氮 /
吸附 /
热力学 /
动力学
Key words
ion exchange resins /
ammonia-nitrogen /
adsorption /
thermodynamics /
kinetics
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