期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 494, 期 -, 页码 65-73出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2016.01.021
关键词
Electrospinning; Nanofibrous filter paper; Chitosan; Polycaprolactam; Cr(VI) removal
资金
- National Natural Science Foundation of China [51172062, 51472074]
- Science and Technology Project of Hebei Province [15273627]
- Scientific Research Foundation for Colleges and Universities of Hebei Province [QN2014051]
- Hundred Talents Program of Hebei Province of China [E2012100005]
- Engagement fund of North China University of Science and Technology [GP201517]
Chitosan/polycaprolactam (PA6) nanofibrous filter paper (NFP) was prepared by electrospinning technique. Characterization with Fourier transformation infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) indicated that there was weak interaction (hydrogen bonds) between PA6 and chitosan, and the average diameter of the composite nanofibers decreased as the chitosan content was increased. The maximum adsorption capacity of Cr(VI) on the NFP via filtration (114.7 mg g(-1)) was much higher than that via static adsorption (81.7 mg g(-1)) and shaking adsorption (80.7 mg g(-1)). Because the Cr(VI)-containing solution was forced to flow through the whole membrane in filtration, the chelation sites inside the membrane could be exploited, leading to the enhancement of the Cr(VI) adsorption. The hydrogen bonds between chitosan and PA6 could enhance the mechanical strength and the acid fastness of the NFP. Therefore, the NFP desorbed by H2SO4 can be well reinstated, and the adsorption capacity of Cr(VI) decreased slightly (only 17.9%) after three filtration cycles. On the basis of X-ray photoelectron spectroscopy (XPS) analysis, the possible mechanism for the Cr(VI) removal was that Cr(VI) was initially adsorbed on the NFP due to the electrostatic attraction, and subsequently reduced to the less toxic form Cr(III) by the amino groups of chitosan. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据