Preparation of mesoporous poly (acrylic acid)/SiO2 composite nanofiber membranes having adsorption capacity for indigo carmine dye |
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Authors: | Xu Ran Jia Min Li Fengting Wang Hongtao Zhang Bingru Qiao Junlian |
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Institution: | (1) State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai, 200092, P.R. China |
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Abstract: | Mesoporous poly (acrylic acid)/SiO2 (PAA/SiO2) composite nanofiber membranes functionalized with mercapto groups were fabricated by a sol-gel electrospinning method, and
their adsorption capacity for indigo carmine was investigated. The membranes were characterized by scanning electron microscopy
(SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, x-ray powder
diffraction (XRD), and nitrogen adsorption–desorption measurement. SEM and TEM observation results showed that the PAA/SiO2 fibers had diameters between 400–800 nm and mesopores with an average pore size of 3.88 nm. The specific surface area of
the mesoporous nanofiber membranes was 514.89 m2/g. The characteristic peaks for mercapto group vibration in FTIR and Raman spectra demonstrated that the mercapto groups
have been incorporated into the silica skeleton. The adsorption isotherm data of indigo carmine on the membranes fit well
with Redlich–Peterson model, and the maximum adsorption capacity calculated was 523.11 mg/g. It was found that the removal
rate of indigo carmine by the membranes reached a maximum of 98% in 90 min and the adsorption kinetics followed a pseudo-second-order
model. The high adsorption capacity of PAA/SiO2 nanofiber membrane makes it a promising adsorbent for indigo carmine removal from the wastewater. |
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