Citation: Ya-nan Li, Bin Wang, Jiao-na Wang, Cong-ju Li, Xiu-yan Li. Preperation and Chromium Removal Performance of PAEA Nanofiber Membranes[J]. Acta Polymerica Sinica, ;2018, 0(12): 1532-1538. doi: 10.11777/j.issn1000-3304.2018.18117 shu

Preperation and Chromium Removal Performance of PAEA Nanofiber Membranes

Ya-nan Li ^1,# ,
Bin Wang ^1,2,3,# ,
Jiao-na Wang ^1,2,3 ,
Cong-ju Li ⁴ ,
Xiu-yan Li ^1,,

4.
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083

Corresponding author: Xiu-yan Li, clylxyan@bift.edu.cn
Received Date: 9 May 2018
Revised Date: 7 July 2018
Available Online: 24 July 2018

Electrospun nanofiber membrane of polyacrylonitrile (PAN ENMs) was chemically modified by reacting with ethylenediamine to make it into amino-functionalized on its surface, denoted as PAEA ENMs. The effects of ethylenediamine concentration, reaction temperature and reaction time of the hydrothermal process on the conversion of the cyano group and the adsorption capacity of the resulted nanofiber membranes were studied systematically. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and water contact angle test were used to characterize the physicochemical properties of PAEA ENMs. The results showed that PAEA nanofibers swelled and bended to a certain degree after hydrothermal treatment at 95 °C for 2 h, and the net-like structure of the membrane was well maintained. On the FTIR spectra, the peaks around 3300 - 3500 cm⁻¹ were ascribed to the typical absorption of ―NH₂ group. Water contact angle decreased from 114.5° for PAN ENMs to 44.7° for PAEA ENMs. All these suggest that PAEA ENMs was fabricated successfully. In order to investigate the netal ions removal performance through adsorption on the PAEA ENMs, a variety of Cr(VI) adsorption experiments were carried out and the adsorption kinetics and adsorption isotherms analized. The results showed that the adsorption capacity of PAEA ENMs was as high as 175.94 mg/g at pH = 2, and the adsorption equilibrium can be reached within 8 h. This is mainly due to the protonation of ―NH₂ groups under the acid condition, which is benefit for adsorbing negative HCrO₄^–. The adsorption behavior fitted to the pesudo-second order kinetics and Langmuir isotherm adsorption model. Moreover, the PAEA ENMs can be reused after being washed with dilute NaOH solution separated from water. About 70% of its initial adsorption capacity was retained after four recycled use. Therefore, this PAEA ENMs has a high recyclability and is promising material for heavy metal ions adsorption.
- Electrospinning,
- Adsorption,
- Hexavalent chromium ions,
- Chemistry modification
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