Abdolmaleki Aliyeh Yousefi, Zilouei Hamid, Khorasani Saied Nouri, Zargoosh Kiomars
Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran E-mail:
Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Water Sci Technol. 2018 Mar;77(5-6):1324-1335. doi: 10.2166/wst.2018.010.
In this work, the preparation and characterization of glutaraldehyde-crosslinked electrospun nanofibers of chitosan/poly(vinyl alcohol) (GCCPN) as a new adsorbent for tetracycline (TC) is reported. Electrospun nanofibers of chitosan/poly(vinyl alcohol) (PVA) were prepared by employing a 75:25 volumetric ratio of chitosan:PVA, voltage of 30 kV, collection distance of 10 cm, and injection flow rate of 2 mL/h. Then, the nanofibers were crosslinked via applying the glutaraldehyde on them for 3 h at 40 °C. The nanofibers were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction. Uniform beadless nanofibers with minimum diameters of 3-11 and 6-18 nm were obtained before and after crosslinking, respectively. Then the applicability of the synthesized GCCPN for removal of TC from aqueous solutions was investigated. The response surface method was applied to evaluate the influence of pH (6-12), TC concentration (50-250 mg/L) and the adsorbent dose (0.05-0.25 g in 20 mL solution) on the adsorption characteristics of GCCPN. The maximum adsorption capacity was 102 mg/g. The adsorption kinetics was explained most effectively by the pseudo-second-order model. The adsorption data of TC on the GCCPN surface was explained well by the Langmuir isotherm model.
在本研究中，报道了壳聚糖/聚乙烯醇戊二醛交联电纺纳米纤维（GCCPN）作为四环素（TC）新型吸附剂的制备及表征。采用壳聚糖与聚乙烯醇（PVA）体积比为75:25、电压30 kV、收集距离10 cm、注射流速2 mL/h的条件制备壳聚糖/聚乙烯醇（PVA）电纺纳米纤维。然后，在40℃下将戊二醛施加于纳米纤维上3小时进行交联。使用扫描电子显微镜、傅里叶变换红外光谱（FTIR）和X射线衍射对纳米纤维进行表征。交联前后分别获得了最小直径为3 - 11 nm和6 - 18 nm的均匀无珠纳米纤维。随后研究了合成的GCCPN从水溶液中去除TC的适用性。应用响应面法评估pH值（6 - 12）、TC浓度（50 - 250 mg/L）和吸附剂剂量（20 mL溶液中0.05 - 0.25 g）对GCCPN吸附特性的影响。最大吸附容量为102 mg/g。吸附动力学最有效地由准二级模型解释。TC在GCCPN表面的吸附数据由朗缪尔等温线模型很好地解释。
