title: Enhanced chromium (VI) adsorption using nanosized chitosan fibers tailored by electrospinning.
abstract: Stacked chitosan nanofibers with an average diameter of 75 nm were successfully produced by electrospinning using 5 wt% chitosan in acetic acid as the spinning solution. The fibers were then cross-linked with glutaraldehyde to remove chromium [Cr(VI)] from water via static adsorption. It was found that the adsorption correlated well with pseudo-second order kinetic model, and followed a mixed isotherm of Freundlich and Langmuir. The maximum nanofibers adsorption capacity was 131.58 mg/g, more than doubled that of chitosan powders. Common co-ions such as Cl(-), NO3(-), Na(+), Ca(2+) and Mg(2+) had little or no effect on the adsorption but SO4(2-) was an exception. Fourier transform infrared spectroscopy and X-ray photoelectron spectrophotometer analyses indicated that both amino and hydroxyl groups of chitosan were engaged in the adsorption.
authors: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: lileilyq@outlook.com.
authors: Lei
authors: L
authors: Li
authors: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: yxli@ipe.ac.cn.
authors: Yanxiang
authors: Y
authors: Li
authors: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: lxcao@ipe.ac.cn.
authors: Lixia
authors: L
authors: Cao
authors: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: cfyang@ipe.ac.cn.
authors: Chuanfang
authors: C
authors: Yang
mesh_terms: D065638:Absorption, Radiation; D048271:Chitosan / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry*
chemical_list: D002857:Chromium; D048271:Chitosan
keywords: Adsorption; Chitosan; Chromium (VI); Electrospinning; Nanofiber