Adsorption of tetracycline from water using glutaraldehyde-crosslinked electrospun nanofibers of chitosan/poly(vinyl alcohol)

Abstract

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.

Identification and imaging of miR-155 in the early screening of lung cancer by targeted delivery of octreotide-conjugated chitosan-molecular beacon nanoparticles

“…Chitosan nanoparticles and OCT (GL Biochem, China) molecules both contained amino and chemical cross-linker glutaraldehyde that combines the two. The methods are referenced in the literature and improved accordingly (Abdolmaleki et al., 2018; Gür et al., 2018; Gabriel et al., 2017; Sun et al., 2017). The CS-MB and OCT were simultaneously added in the 1% glutaraldehyde solution system.…”

Bio‐Based Nanofibers Involved in Wastewater Treatment

“…Tetracycline, another major pharmaceutical pollutant was removed using chitosan blended with PVA nanofibers via chemical crosslinking by glutaraldehyde. The concentrations were optimized to volumetric ratio of 75:25 (chitosan:PVA) using response surface methodology which showed good adsorption capacity (102 mg g −1 ) . Immobilization of TiO 2 nanoparticles on electrospun gum karaya/PVA nanofibers utilized in degradation of bisphenol A and diclofenac under UV radiation.…”

“…The concentrations were optimized to volumetric ratio of 75:25 (chitosan:PVA) using response surface methodology which showed good adsorption capacity (102 mg g −1 ). [19] Immo-bilization of TiO 2 nanoparticles on electrospun gum karaya/ PVA nanofibers utilized in degradation of bisphenol A and diclofenac under UV radiation. The methane plasma treated TiO 2 membranes showed the characteristics of increased hydrophobicity and sorption capacity due to the formation of water droplets on the surface, thereby, leading to reduction in 18% of bisphenol A and 20% of diclofenac mainly due to the generation of free radicals upon UV irradiation.…”

“…The factors such as pH, temperature, and surface charge density affect the interaction process. Modifications such as deacetylation, (2,2,6,6‐tetramethylpiperidin‐1‐yl)oxyl (TEMPO)‐mediated oxidation and hydrolysis on the fibers also had an impact on adsorption process . In few cases, the overall shape of the nanofibrous adsorbent affect the behavior, especially, the spherical shape accommodated more molecules on the surface due to high area .…”

“…Modifications such as deacetylation, (2,2,6,6-tetramethylpiperidin-1-yl) oxyl (TEMPO)-mediated oxidation and hydrolysis on the fibers also had an impact on adsorption process. [19,20] In few cases, the overall shape of the nanofibrous adsorbent affect the behavior, especially, the spherical shape accommodated more molecules on the surface due to high area. [21] Further, aerogels developed from bio-based nanofibers having highly porous network with excellent physiochemical properties and shape regeneration capacity show signs of usage in the water treatment industry.…”