Synthesis of Fe3O4/Polyacrylonitrile Composite Electrospun Nanofiber Mat for Effective Adsorption of Tetracycline

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• 作者：Qing Liu ; Lu-Bin Zhong ; Quan-Bao Zhao ; Craig Frear ; Yu-Ming Zheng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：7
• 期：27
• 页码：14573-14583
• 全文大小：733K
• ISSN：1944-8252

文摘

Novel Fe<sub>3sub>O<sub>4sub>/polyacrylonitrile (PAN) composite nanofibers (NFs) were prepared by a simple two-step process, an electrospinning and solvothermal method. Characterization by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) demonstrated formation of a uniform nanoparticles coating (about 20 nm in thickness) on the PAN nanofiber backbone. The coating was constructed by well-crystallized cubic phase Fe<sub>3sub>O<sub>4sub> nanoparticles as examined by X-ray diffraction spectroscopy (XRD). The coating doubled the specific surface area of NFs, from 8.4 to 17.8 m<sup>2sup> g<sup>鈥?sup>, as confirmed by nitrogen sorption isotherm analysis. To evaluate the feasibility of Fe<sub>3sub>O<sub>4sub>/PAN composite NFs as a potential adsorbent for antibiotic removal, batch adsorption experiments were conducted using tetracycline (TC) as the model antibiotic molecule. The results showed that Fe<sub>3sub>O<sub>4sub>/PAN composite NFs were effective in removing TC with no impactful loss of Fe in the pH regime of environmental interest (5鈥?). The adsorption of TC onto Fe<sub>3sub>O<sub>4sub>/PAN composite NFs better fitted the pseudo-second-order kinetics model, and the maximum adsorption capacity calculated from Langmuir isotherm model was 257.07 mg g<sup>鈥?sup> at pH 6. The composite NFs also exhibited good regenerability over repeated adsorption/desorption cycles. Surface complexation between TC and the composite NFs contributed most to the adsorption as elucidated by X-ray photoelectron spectroscopy (XPS). This highly effective and novel adsorbent can be easily modularized and separated, promising its huge potential in drinking and wastewater treatment for antibiotic removal.