Study on Preparation of SA/PVA Composite Hydrogel and Adsorption of Co2+and MB
Using sodium alginate(SA),polyvinyl alcohol(PVA)as raw materials,acrylic acid(AA)as monomer to synthesize SA/PVA-g-AA hydrogel,the functional group structure and micromorphology of the hydrogel material were characterized.Using Co2+/MB as the adsorption object,the effects of pH,initial mass concentration,hydrogel addition on the adsorption of hydrogel performance were investigated,and the adsorption dynamics were explored.The results show that SA/PVA-g-AA hydrogel is a porous surface area of 120.896 7 m2/g and an average adsorption pore diameter of 8.069 08 nm which is beneficial to the adsorption of Co2+and MB.The composite hydrogel has a fast adsorption rate for Co2+/MB,and can reach adsorption equilibrium within 60 min,which is consistent with the quasi-second-order kinetic model.The maximum removal rates of Co2+and MB reaches 95.01%and 98.78%,respectively,when the pH value is 3 and 7,the hydrogel dosage is 0.15 g,and the initial mass concentration is 100 mg/L.
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