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首页> 外文期刊>RSC Advances >Preparation and characterization of a series of porous anion-exchanger chelating fibers and their adsorption behavior with respect to removal of cadmium(ii)
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Preparation and characterization of a series of porous anion-exchanger chelating fibers and their adsorption behavior with respect to removal of cadmium(ii)

机译：一系列多孔阴离子交换螯合纤维的制备与表征及其相对于除去镉（II）的吸附行为

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The aim of the present study was to investigate a series of porous anion-exchanger chelating fibers (PP- g -AA-Am), prepared using polypropylene (PP) for the removal of Cd( II ) in non-salt systems and in high-salt complex systems. FTIR, BET, FESEM, and XPS spectra indicated that AA was grafted onto the surface of PP fibers and, subsequently, amino functional groups and amide bonds were introduced by the amide reaction. A batch experimental study indicated that the adsorption of Cd( II ) could be well-fitted with the pseudo-second-order kinetic model and the Freundlich isotherm. Thermodynamic studies indicated that the adsorption reaction was a spontaneous and endothermic process. Because of the electrostatic interactions and coordination bonds between Cd( II ) and PP- g -AA-Am fibers, the resulting adsorption capacities are as follows: PP- g -AA-EDA (125.34 mg g ~(?1) ), PP- g -AA-DETA (116.15 mg g ~(?1) ), PP- g -AA-TETA (93.02 mg g ~(?1) ) and PP- g -AA-TEPA (81.01 mg g ~(?1) ). The presence of high-salt NaCl solution, as well as CaCl _(2) , KCl and MgCl _(2) , did not significantly affect the Cd( II ) adsorption process, whereas strongly acidic or strongly alkaline conditions were unfavorable. In addition, the reusability of the obtained fibers, without a significant deterioration in performance, was demonstrated with at least five repeated cycles.
机译：本研究的目的是研究使用聚丙烯（PP）制备的一系列多孔阴离子交换螯合纤维（PP-G-G-AM），用于在非盐体系中除去CD（II）和高-salt复杂系统。 FTIR，BET，FESEM和XPS光谱表明AA被移植到PP纤维的表面上，随后，通过酰胺反应引入氨基官能团和酰胺键。分批实验研究表明，CD（II）的吸附可以充分配合伪二阶动力学模型和Freundlich等温线。热力学研究表明，吸附反应是自发性和吸热过程。由于CD（II）和PP-G-G-AM纤维之间的静电相互作用和配位键，所得的吸附能力如下：PP-G -AA-EDA（125.34mg g〜（β1）），PP - g -aa-deta（116.15mg g〜（α1）），pp-g -aa-teta（93.02mg g〜（α1））和pp-g-g-tepa（81.01 mg g〜（？1 ）））。高盐NaCl溶液以及CaCl _（2），KCl和MgCl _（2）的存在并未显着影响CD（II）吸附过程，而强酸性或强烈的碱性条件是不利的。另外，通过至少五次重复的循环对所得纤维的可重用性没有显着恶化。

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