In this paper, polypropylene (PP) nanofibers were prepared using the melt forcespinning technology by a handmade device. Then, the surface of PP nanofibers was grafted through the high energy electron beams (EB) pre-irradiation method by acrylonitrile and methacrylic acid monomers with grafting percentage of 145.55%. The 92% of grafted cyano functional groups on nanofibers were converted to amidoxime groups, then modified by an alkaline solution. Characterization and surface morphology of nanofibers were investigated by Fourier Transform Infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The produced adsorbent was used to adsorb U(VI) ions from simulated seawater. The maximum adsorption was 83.24 mg/g in the optimal time of 60 min and optimal pH of 4. The optimum desorption efficiency was 80% in HCl 0.5 M. The kinetic data in optimum conditions showed that the adsorption followed an S-shaped kinetic model. The Adsorption equilibrium studies presented S-shape isotherm model that confirmed the adsorption occurs both on the adsorbent surface and in its pores The thermodynamic studies indicated spontaneous adsorption of uranyl ions and the higher efficiency adsorption at higher temperatures. The selectivity of adsorbent for metal ions followed the order V(V)>U(VI)>CO(II)>Ni(II)>Fe(II). These results shows that the prepared and modified nanofibers in this work can be considered as an effective and promising adsorbents for removal of uranium ions from seawater with high efficiency.

译文

在本文中,通过手工设备使用熔体固定技术制备了聚丙烯 (PP) 纳米纤维。然后,用丙烯腈和甲基丙烯酸单体通过高能电子束 (EB) 预辐照方法接枝PP纳米纤维的表面,接枝百分比为145.55%。将纳米纤维上接枝的氰基官能团的92% 转化为胺肟基团,然后用碱性溶液改性。通过傅里叶变换红外 (FTIR) 光谱和扫描电子显微镜 (SEM) 研究了纳米纤维的表征和表面形貌。所产生的吸附剂用于从模拟海水中吸附U(VI) 离子。最适时间为60  min,最适pH为4,最大吸附量为83.24  mg/g。80% 了HCl 0.5  M的最佳解吸效率。在最佳条件下的动力学数据表明,吸附遵循s形动力学模型。吸附平衡研究提出了s形等温线模型,该模型证实了吸附既发生在吸附剂表面,又发生在其孔中。热力学研究表明铀酰离子的自发吸附,并且在较高的温度下具有更高的吸附效率。吸附剂对金属离子的选择性顺序为V(V)>U(VI)>CO(II)>Ni(II)>Fe(II)。这些结果表明,在这项工作中制备和改性的纳米纤维可以被认为是一种有效且有前途的吸附剂,可以高效地从海水中去除铀离子。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录