Preparation and application of sodium alginate / cellulose hydrogel beads

Different mass fraction of sodium alginate / cellulose hydrogel beads were prepared by the falling ball method based on reversal p H and characterized by scanning electron microscopy( SEM) and fourier transform infrared spectroscopy( FT-IR). The results showed that sodium alginate / cellulose hydrogel beads including less than or equal to 50% sodium alginate( mass fraction) can keep a stable spherical structure with 3D network porous structure and have a good adsorption performance of cationic dyes( methylene blue,auramine O and safranine T). The adsorption capacity of methylene blue on the hydrogel beads containing 50% sodium alginate( mass fraction) was 163. 36 mg / g. The adsorption was well described by pseudo-second-order kinetics and they still keep the initial 81% adsorption capacity after five times adsorption-desorption experiment. Therefore,the compound hydrogel beads could be employed as a low-cost alternative to other adsorbents in the removal of dyes from aqueous solution.