Preparation and Characterization of Modified Bamboo Cellulose Hydrogel and Analysis of Its Adsorption Capacity to Methylene Blue
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Abstract:
A composite hydrogel displaying pH sensitivity was successfully prepared from bamboo cellulose extracted from bamboo off-cuts, with added κ-carrageenan (κ-CN) by inverse suspension polymerization, and using epichlorohydrin (ECH) as a crosslinking agent. The prepared composite hydrogels and their swelling kinetics were characterized by Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetric analysis, and scanning electron microscopy. In addition, methylene blue was used as a model drug molecule to study the effects of different initial concentrations and initial pH values on the adsorption capacity of the hydrogel. The results of these analyses showed that modified bamboo cellulose and κ-CN underwent chemical cross-linking, forming a hydrogel with a three-dimensional network structure with a fixed decomposition temperature. The hydrogel showed pH-sensitive swelling behavior, caused by the variations in electrostatic repulsion exhibited by its negatively-charged side chain groups in solutions with varying pH. The initial swelling phase complied with the Fickian diffusion model, while the entire swelling process complied with the Schott model. The hydrogel was porous and displayed swelling capacity, which enabled it to express high adsorption capacity. The adsorption test showed it had a high adsorption capacity to the model drug (methylene blue). Therefore, this composite hydrogel could potentially be applied to facilitate drug adsorption and sustained release.