离子交换树脂吸附氨氮的性能

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清华大学辅仁网/2017-07-07

离子交换树脂吸附氨氮的性能

杨少霞¹, 章晶晶¹, 杨宏伟², 张莉¹, 高攀¹

1. 华北电力大学可再生能源学院, 北京 102206;
2. 清华大学环境学院, 北京 100084

Adsorption of ammonia-nitrogen on ion exchange resins

YANG Shaoxia¹, ZHANG Jingjing¹, YANG Hongwei², ZHANG Li¹, GAO Pan¹

1. School of Renewable Energy, North China Electric Power University, Beijing 102206, China;
2. School of Environment, Tsinghua University, Beijing 100084, China

摘要:

输出: BibTeX | EndNote (RIS)

摘要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。

关键词 ：离子交换树脂,氨氮,吸附,热力学,动力学

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.

Key words：ion exchange resins ammonia-nitrogen adsorption thermodynamics kinetics

收稿日期: 2015-01-24 出版日期: 2015-09-08

ZTFLH:

X703.1

引用本文:

杨少霞, 章晶晶, 杨宏伟, 张莉, 高攀. 离子交换树脂吸附氨氮的性能[J]. 清华大学学报（自然科学版）, 2015, 55(6): 660-665.
YANG Shaoxia, ZHANG Jingjing, YANG Hongwei, ZHANG Li, GAO Pan. Adsorption of ammonia-nitrogen on ion exchange resins. Journal of Tsinghua University(Science and Technology), 2015, 55(6): 660-665.

链接本文:

http://jst.tsinghuajournals.com/CN/或 http://jst.tsinghuajournals.com/CN/Y2015/V55/I6/660

图表:

表1　样品的相关参数

图1　不同树脂投加量对氨氮去除率的影响

图2　不同树脂投加量对氨氮吸附速率的变化

表2　不同投加量001×7和D113的氨氮平衡吸附容量

图3　溶液PH值树脂对氨氮去除率的影响

图4　反应温度对树脂去除氨氮效率的影响

图5　Langmuir吸附等温曲线

表3　Langmuir等温曲线拟合相关结果

图6　树脂吸附氨氮的焓变曲线

表4　树脂吸附氨氮过程的热力学参数

图7　二级动力学拟合图

表5　树脂反应动力学平衡常数

图8　温度与反应速率常数k₂的关系图

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