Abstract:To obtain an adsorbent with high efficiency for the decolorization of dyes, sodium alginate, polyvinyl alcohol and zeolite are used as adsorption materials. Based on the results of the single factor experiment, Box-Behnken experimental design is adopted to conduct a three-factor and three-level response surface test. Decolorization rate is taken as the response; sodium alginate (SA), polyvinyl alcohol (PVA) and zeolite concentration are selected as the influencing factors to optimize the preparation conditions. The results show that the optimum preparation conditions of SPZ are: SA 11 g/L, PVA 21 g/L, zeolite 52 g/L, and the actual decolorization rate is 88.57%. SEM result shows that methylene blue (MB) is successfully adsorbed on SPZ surface. FTIR result shows that there are hydrogen bonds and electrostatic interactions between SPZ and MB. The adsorption process follows the quasi-second-order kinetics and fitts Langmuir isothermal adsorption model, which indicates that the adsorption process can be described as physical diffusion accompanied by chemical adsorption. The results indicate that the SPZ adsorbent has good stability and high decolorization rate. This study will offer references to the application of sodium alginate composite material in the treatment of dye wastewater.
