Investigation of the removal and recovery of nitrate by an amine-enriched composite under different fixed-bed column conditions
Investigation of the removal and recovery of nitrate by an amine-enriched composite under different fixed-bed column conditions
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DOI：
10.1016/j.psep.2021.04.027
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发表时间：
2021-04-28
影响因子：
7.8
通讯作者：
Rodrigues, Debora Frigi
中科院分区：
文献类型：
--
作者：
Ansari, Ali;Nadres, Enrico Tapire;Rodrigues, Debora Frigi
在固定床柱中连续吸附硝酸盐是从水中去除硝酸盐的有效方法。本研究通过壳聚糖（CS）和聚乙烯亚胺（PEI）与戊二醛（GLA）交联制备了富胺聚合物复合吸附剂。将 CS-PEI-GLA 填充到柱中，研究了流速、进水浓度、床高度和其他离子种类对柱性能的影响。在最低流量和最高进水浓度和床高下实现最高吸附容量。根据 Thomas 模型确定最大吸附容量为 137.62 mg NO3--N/g。该柱在 1000 ppm 氯化物存在下具有可接受的硝酸盐去除率，但在 1000 ppm 硫酸盐存在下性能较差，因为硫酸盐对结合位点的竞争效应。最好的回收剂是 0.5 M NaCl，因为它可以使色谱柱再生
Continuous adsorption of nitrate in a fixed-bed column can be an effective method for its removal from water. In this study, an amine-rich polymer composite adsorbent was prepared by crosslinking chitosan (CS) and polyethyleneimine (PEI) with glutaraldehyde (GLA). The CS-PEI-GLA was packed into columns and the effect of flow rate, influent concentration, bed height, and other ionic species on the column performance was investigated. The highest adsorption capacity was achieved at the lowest flow rate and highest influent concentration and bed height. Maximum adsorption capacity of 137.62 mg NO3--N/g was determined from the Thomas model. The column had acceptable nitrate removal in the presence of 1000 ppm chloride but poor performance in the presence of 1000 ppm sulfate due to the competitive effect of sulfate for binding sites. The best recovery agent was 0.5 M NaCl as it could regenerate the column to