Preparation, characterization and kinetics study of chitosan/PVA electrospun nanofiber membranes for the adsorption of dye from water
-
Yang Mei
,
Feng Yan
Abstract
In this study, chitosan (CS) nanofibers with two different degrees of deacetylation (DDA) were first successfully fabricated from its solution in 1% aqueous acetic acid solution by mixing with poly(vinyl alcohol) (PVA) solution at a weight ratio of 50/50 via the electrospinning method. Then, the CS/PVA membranes were further modified by glutaraldehyde vapor. The prepared nanofibers were characterized by field electron scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), the tensile test, the contact angle test, the weight loss test and the adsorption test for Congo red (CR). SEM analysis showed defect-free nanofibers and a uniform diameter distribution, with an average diameter of 100–125 nm. Subsequently, FTIR spectroscopy, XRD and TGA indicated that the modified CS/PVA membranes had a relatively higher thermal stability, because the thermal decomposition temperature of the unmodified CS/PVA membranes (~250°C) increased to a higher temperature (~ 300°C) for the modified CS/PVA. The nanofiber membranes after modification possessed better mechanical tensile properties. The membranes with lower DDA had a relatively higher tensile strength, which can withstand the maximum tensile strength of up to 6.36 MPa. Furthermore, the resulting membranes showed excellent hydrophilicity and kept their stability in distilled water, acidic, and basic media for 20 days. In the adsorption study, the maximum adsorption capacity of the membrane for CR was 358 mg/l in the optimum operating conditions of 25°C, pH = 6, 0.3 g membrane and 50 ml of 100 mg/l CR solutions. The resulting nanofibers membranes showed a better fitting to the Langmuir isotherm model and pseudo-second-order kinetic model.
Acknowledgments
This work is supported by the Scientific Research Program funded by Shaanxi Provincial Education Department (Program no. 16JK1340), Natural Science Basic Research Plan in Shaanxi Province of China (Program no. 2017JQ5054), and Xi’an Polytechnic University innovation fund for graduate students (Program no. chx201801).
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Material properties
- Effect of temperature on the impact behavior of PVC/ASA binary blends with various ASA terpolymer contents
- The infrared spectroscopy of chitosan films doped with silver and gold nanoparticles
- The effect of the addition of a slip agent on the rheological properties of polyethylene: off-line and in-line measurements
- Analysis of the mechanical properties of polymer materials considering lateral confinement effects
- Effect of gamma irradiation on the physicochemical and rheological properties of enzyme-catalyzed tragacanth-based injectable hydrogels
- Effects of MAH/St grafted nanocellulose on the properties of carbon reinforced styrene butadiene rubber
- Preparation and assembly
- Preparation, characterization and kinetics study of chitosan/PVA electrospun nanofiber membranes for the adsorption of dye from water
- Engineering and processing
- Polymer-induced metal diffusion during plastic processing: a reason for deposit formation
- Optimization of process parameters in plastic injection molding for minimizing the volumetric shrinkage and warpage using radial basis function (RBF) coupled with the k-fold cross validation technique
- Effects of process conditions on the heat transfer coefficient at the polymer-mold interface and tensile strength of thin-wall injection molding parts
Articles in the same Issue
- Frontmatter
- Material properties
- Effect of temperature on the impact behavior of PVC/ASA binary blends with various ASA terpolymer contents
- The infrared spectroscopy of chitosan films doped with silver and gold nanoparticles
- The effect of the addition of a slip agent on the rheological properties of polyethylene: off-line and in-line measurements
- Analysis of the mechanical properties of polymer materials considering lateral confinement effects
- Effect of gamma irradiation on the physicochemical and rheological properties of enzyme-catalyzed tragacanth-based injectable hydrogels
- Effects of MAH/St grafted nanocellulose on the properties of carbon reinforced styrene butadiene rubber
- Preparation and assembly
- Preparation, characterization and kinetics study of chitosan/PVA electrospun nanofiber membranes for the adsorption of dye from water
- Engineering and processing
- Polymer-induced metal diffusion during plastic processing: a reason for deposit formation
- Optimization of process parameters in plastic injection molding for minimizing the volumetric shrinkage and warpage using radial basis function (RBF) coupled with the k-fold cross validation technique
- Effects of process conditions on the heat transfer coefficient at the polymer-mold interface and tensile strength of thin-wall injection molding parts
