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首页> 外文期刊>Journal of Polymers and the Environment >Removal of Nitrate from Water by Alginate-Derived Carbon Aerogel Modified by Protonated Cross-Linked Chitosan
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Removal of Nitrate from Water by Alginate-Derived Carbon Aerogel Modified by Protonated Cross-Linked Chitosan

机译：通过藻酸盐衍生的碳气凝胶从水中除去硝酸盐通过质子化交联壳聚糖改性

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摘要

In this study, a carbonaceous aerogel with superior structural properties was synthesized from sodium alginate with a specific surface area and density of about 470m(2)g(-1) and 0.05gcm(-3), respectively. In order to adsorb nitrate from water, the surface of the aerogel was modified by protonated cross-linked chitosan. To investigate the morphology, elemental composition, crystalline phases and surface functional groups of the adsorbent, various techniques such as field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, Fourier transform infrared spectroscopy were employed. To study the performance of this green adsorbent in nitrate removal process, the effect of nitrate initial concentration, adsorbent dosage, pH of solutions were investigated in batch mode. It was revealed that the Langmuir isotherm model could properly describe the experimental equilibrium data and the maximum adsorption capacity was evaluated to be about 18mgg(-1) at neutral pH and room temperature. Besides, the kinetic data perfectly followed the pseudo-second order model. Thermodynamic analysis showed that the adsorption reaction was spontaneous, exothermic with decreased randomness at the solid-liquid interface. The macroscopic size of the adsorbent allowed its facile separation from the solution.
机译：在该研究中，用比藻酸钠合成具有优异结构性质的碳质气体，分别从藻酸钠合成，具有比表面积和约470m（2 )g（-1）和0.05gcm（-3）的密度。为了从水中吸附硝酸盐，通过质子化交联壳聚糖改性气凝胶表面。为了探讨吸附剂的形态，元素组成，结晶相和表面官能团，采用各种技术，例如场发射扫描电子显微镜，能量分散X射线光谱，X射线衍射分析，傅里叶变换红外光谱。为了研究这种绿色吸附剂在硝酸盐去除过程中的性能，研究硝酸盐初始浓度，吸附剂剂量，溶液的含量。据透露，Langmuir等温模型可以正确描述实验性平衡数据，并且在中性pH和室温下评价最大吸附容量为约18mgg（-1）。此外，动力学数据完全遵循伪二阶模型。热力学分析表明，吸附反应是自发的，在固液界面下随机性降低。吸附剂的宏观尺寸允许其容易分离溶液。

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