改性纳米纤维素对磷的动态吸附及再生

doi:10.16085/j.issn.1000-6613.2019-1757

摘要/Abstract

摘要：

以铁改性纳米纤维素[Fe(OH)₃@CNFs]为吸附剂进行动态吸附除磷试验，探究了不同柱高和不同流速对Fe(OH)₃@CNFs吸附磷性能的影响。结果表明：吸附柱填充越高（6～16cm），进水流速越慢（5～10mL/min），吸附达到平衡所需时间越长，越有利于Fe(OH)₃@CNFs对磷的动态吸附。采用NaOH溶液对吸附剂解吸进行原位再生，再生后吸附柱对磷的吸附量为原吸附柱的83%，表明Fe(OH)₃@CNFs材料具有较好的再生能力。通过Yoon-Nelson模型计算吸附50%目标污染物所需的时间，拟合值与实验值的平均相对偏差在1.8%～6.9%之间，表明Yoon-Nelson模型能够很好地描述Fe(OH)₃@CNFs材料对磷的动态吸附行为。使用红外光谱和X射线光电子能谱对吸附机理进行分析发现Fe(OH)₃@CNFs材料对磷具有吸附能力，并且吸附后主要以FePO₄和Fe₂(HPO₄)₃的形式存在。利用吸附柱对生活污水处理厂二沉池出水进行动态吸附，在流速为10mL/min、填装高度为12cm的条件下，饱和时的吸附容量为34.5mg/g。

关键词: 铁改性纳米纤维素, 动态吸附, 磷, 再生

Abstract:

The iron-modified nanocellulose (Fe(OH)₃@CNFs) was used as an adsorbent for dynamic phosphorus removal experiments, and the effects of different column heights and different flow rates on Fe(OH)₃@CNFs phosphorus adsorption performance were investigated. The results showed that the higher the packing column (6—16cm) and the slower the flow velocity of the water (5—10mL/min), the longer the time required for the adsorption to reach equilibrium and the more favorable for Fe(OH)₃@CNFs to phosphorus dynamic adsorption. The NaOH solution was used to desorb the adsorbent for in-situ regeneration. After regeneration, the adsorption capacity of the adsorption column was 83% of the original adsorption column, indicating that the Fe(OH)₃@CNFs material had a good regeneration capacity. The Yoon-Nelson model was used to calculate the time required to adsorb 50% of the target pollutants. The average relative deviation between the fitted value and the experimental value was between 1.8% and 6.9%, which showed that the Yoon-Nelson model could well describe the dynamic adsorption behavior of phosphorus by Fe(OH)₃@CNFs materials. Using FTIR and XPS to analyze the adsorption mechanism, it was found that Fe(OH)₃@CNFs material had the ability to adsorb phosphorus, and mainly existed as FePO₄ and Fe₂(HPO₄)₃ after adsorption. The adsorption column was used to dynamically adsorb the effluent from the secondary sedimentation tank of the domestic sewage treatment plant, and at a flow rate of 10 mL/min and a packing height of 12cm, the adsorption capacity at saturation was 34.5mg/g.

Key words: iron-modified nanocellulose, dynamic adsorption, phosphorus, regeneration

中图分类号:

X703.1

袁林, 陈滢, 刘敏, 王婷庭. 改性纳米纤维素对磷的动态吸附及再生[J]. 化工进展, 2020, 39(7): 2907-2914.

Lin YUAN, Ying CHEN, Min LIU, Tingting WANG. Dynamic adsorption of phosphorus by modified nano cellulose and its regeneration[J]. Chemical Industry and Engineering Progress, 2020, 39(7): 2907-2914.

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