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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of alginate beads filled with nanohydroxyapatite: An efficient approach for fluoride sorption
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Synthesis of alginate beads filled with nanohydroxyapatite: An efficient approach for fluoride sorption

机译：纳米羟基磷灰石填充藻酸盐珠的合成：氟化物吸附的有效方法

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Nanohydroxyapatite (n-HAp) powder is a promising adsorbent material with high defluoridation capacity (DC); however, it causes pressure drop during field applications. To overcome such problems and utilize the advantages of n-HAp, it is aimed to prepare n-HAp in a usable bead form with the support of alginate (Alg) biopolymer. n-HApAlgLa composite beads were synthesized by introducing n-HAp powder in Alg polymeric gel, and the resulting solution was dropped into La3+ ions for crosslinking. Defluoridation experiments were carried out in batch mode to optimize various influencing parameters like contact time, pH, challenger anions, initial fluoride concentrations, and temperature. The beads were characterized using Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy with energy-dispersive X-ray analyzer analysis. The sorption process was explained using diverse isotherms and kinetic models. The values of thermodynamic parameters indicate that the nature of fluoride is spontaneous and endothermic in nature. In field studies, n-HApAlgLa beads reduce the fluoride concentration below the tolerance limit. The regeneration and reusability studies were proposed to effectively use the sorbent. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41937.
机译：纳米羟基磷灰石（n-HAp）粉末是一种具有高脱氟能力（DC）的有前途的吸附材料。但是，它会导致现场应用期间的压力下降。为了克服这些问题并利用n-HAp的优势，目的在于在藻酸盐（Alg）生物聚合物的支持下以可用的珠粒形式制备n-HAp。通过在Alg聚合物凝胶中引入n-HAp粉末来合成n-HApAlgLa复合珠，然后将所得溶液滴入La3 +离子中进行交联。以批处理方式进行脱氟实验，以优化各种影响参数，例如接触时间，pH，激发剂阴离子，初始​​氟化物浓度和温度。使用傅立叶变换红外光谱，X射线衍射和带有能量色散X射线分析仪分析的扫描电子显微镜对珠子进行表征。使用各种等温线和动力学模型解释了吸附过程。热力学参数的值表明氟化物的性质是自然的并且是吸热的。在现场研究中，n-HApAlgLa磁珠将氟化物浓度降低到公差极限以下。提出了再生和可重复使用性研究以有效地使用吸附剂。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41937。

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