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Preparation of Electrospun Hydroxyapatite-Glass Fibers for Removal of Cadmium (Cd +2 ) and Lead (Pb +2 ) from Aqueous Media
Water, Air, & Soil Pollution ( IF 2.9 ) Pub Date : 2020-09-23 , DOI: 10.1007/s11270-020-04856-9
José Hafid Roque-Ruiz , Jesús Alberto Garibay-Alvarado , Nahum Andrés Medellín-Castillo , Simón Yobanny Reyes-López

Hydroxyapatite-silica fibers were prepared by sol-gel process and electrospinning, and their capacity for adsorption of cadmium and lead ions in aqueous solution was studied. The samples were characterized by SEM, FTIR, TGA, DSC, BET, and XRD. The composite consists on a network of continuous rough fibers with mean diameter of 150 ± 40 nm after thermal treatment. The fibers present a mesoporous structure with pore size of 15.75 nm. Fourier transformed infrared spectroscopy and X-ray diffraction demonstrated the presence of crystalline hydroxyapatite and amorphous silica. Adsorption process is represented by Freundlich isotherm, while the adsorption kinetics follow the pseudo-second-order model. The capacity shown by the fibrous material for the removal of lead ions (466.98 mg/g) was five times higher than the capacity observed for the adsorption of cadmium (93.30 mg/g). Therefore, the hydroxyapatite-silica electrospun fibers represent a suitable material for the efficient removal of lead and cadmium ions from aqueous solution.



中文翻译:

静电去除水介质中镉(Cd +2)和铅(Pb +2)的电纺羟基磷灰石玻璃纤维的制备

通过溶胶-凝胶法和静电纺丝法制备了羟基磷灰石-二氧化硅纤维,研究了其在水溶液中对镉和铅离子的吸附能力。通过SEM,FTIR,TGA,DSC,BET和XRD对样品进行表征。该复合物由热处理后平均直径为150±40 nm的连续粗糙纤维网络组成。纤维呈现出具有15.75nm的孔径的中孔结构。傅里叶变换红外光谱和X射线衍射表明存在结晶性羟基磷灰石和无定形二氧化硅。吸附过程以弗氏等温线表示,而吸附动力学遵循伪二级模型。纤维材料显示的去除铅离子的能力(466。98 mg / g)是吸附镉的能力(93.30 mg / g)的五倍。因此,羟基磷灰石-二氧化硅电纺丝纤维是从水溶液中有效去除铅和镉离子的合适材料。

更新日期:2020-09-23
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