Chitosan biopolymer based nanocomposite hydrogels for removal of methylene blue dye

Abstract

Nanocomposite hydrogels were synthesized by γ-radiation-induced copolymerization and crosslinking of Chitosan biopolymer (CS), acrylic acid (AAc) and TiO 2 nanoparticles (CS-PAAc/TiO 2). The structure, morphology, and properties of the nanocomposites were investigated using Fourier-transform infrared spectroscopy, X-Ray Diffraction, Scanning electron microscopy, Transmission electron microscopy, and thermogravimetric analysis techniques. The nanocomposites hydrogel was used for the removal of methylene blue dye (MB) from wastewater. It was found that the presence of TiO 2 in the copolymeric matrix enhances the adsorption by increasing the physical interaction between the dye molecules and the adsorbent surface. The removal percentage increases with the increase in pH of the medium of all investigated samples and the maximum value is obtained at the solution pH is 10. The maximum adsorbent dosage for CS-PAAc/ TiO 2 nanocomposites is 0.20 g and for CS-PAAc hydrogel is 0.15 g per liter of the adsorbate. This study revealed that the loading of TiO 2 nanoparticles into the polymeric matrix of CS-PAAc does a remarkable increase in the removal parentage of MB dye from its aqueous solution.

Green synthesis of chitosan/erythritol/graphene oxide composites for simultaneous removal of some toxic species from simulated solution

“…Two overlapped bands at 1590 and 1640 cm −1 correspond to the N-H bending of the amide group (Mahmoud et al 2020). The band at around 1375 cm −1 is assigned for CH 2 bending.…”

“…It can be adapted to improve its properties, such as biodegradability, sorption capacity, and sustainability Ghobashy 2017, Wang et al 2016). The occurrence of amino groups in the chitosan backbone induces high catalytic activity, metal chelating ability, and biological efficiency (Mahmoud et al 2020). Several protocols were applied for the modification of chitosan.…”

Radiation Synthesis of Green Nanoarchitectonics of Guar Gum-Pectin/Polyacrylamide/Zinc Oxide Superabsorbent Hydrogel for Sustainable Agriculture

“…This was achieved by a green synthetic methodology based on irradiation polymerization and crosslinking of guar gum/Pectin grafted with polyacrylamide with a core of zinc oxide. The gamma route fulfills several advantages such as clean simple technique, high-productivity, low energy, and low-cost process that leads to less contamination and fewer byproducts [21,22]. Radiation treatment can also introduce better surface crosslinking between natural and synthetic polymers by enhancing the formation of free macroradicals which finally lead to formation of crosslinked structure [23].…”

Use of Titanium Dioxide (TiO2) Nanoparticles as Reinforcement Agent of Polysaccharide-Based Materials

“…The Chitosan-TiO 2 hybrid composite has been used for the removal and degradation of diverse organic compounds from aqueous media under UV-light irradiation. Mahmoud et al [92] prepared a chitosan-acrylic acid (CS-AA) hydrogel reinforced with nano-TiO 2 with enhanced swelling and adsorptive properties for methylene blue dye removal from aqueous solution (20 mg L −1 ). They informed of a remarkable change in the adsorption rate of MB (90%) using the CS-AA-TiO 2 hybrid hydrogel (0.20 g) compared with CS-AA (60%) in pH-dependent response with an optimum pH value of 10, mainly associated with the porosity and large surface area of the hybrid hydrogel.…”