亚甲基蓝染液的γ-PGA水凝胶脱色处理

Decolorization of Methylene Blue withyγ-PGA hydrogel

采用两种不同相对分子质量的γ-聚谷氨酸(γ-PGA)制备水凝胶,以FT-IR及SEM法对水凝胶的三维网络结构进行了表征,并将其应用于亚甲基蓝溶液脱色处理。结果表明,两种凝胶对染料的吸附量均随pH值和γ-PGA浓度的增加而增加;相对分子质量100万的凝胶对染料的吸附受转速影响较小,而相对分子质量70万的凝胶在转速120r/min时对染料的吸附会迅速增加。吸附动力曲线表明,0.2g相对分子质量100万的干凝胶在1g/L的染液中,2h内可基本达到吸附平衡,最大吸附染料量为496mg/g;0.2g相对分子质量70万的干凝胶在1g/L的染液中,4h内可基本达到吸附平衡,最大吸附染料量为465mg/g。

Twoγ-PGA hydrogels with different molecular mass are prepared,and then applied to decolorization of Methylene Blue solution.The network structure of hydrogel is characterized by FT-IR and SEM.The results show that hydrogel adsorption of dyes increases with pH and the concentration of γ-PGA,the rotary speed has a little influence on the hydrogel adsorption with molecular mass of 1 million,and there is a rapid increase in hydrogel adsorption with molecular mass of 0.7 million at rotary speed of 120r/min.Adsorption kinetics show that 0.2 g dried hydrogel with molecular mass of 1 million can reach equilibrium within 2 h in1 g/L dye liquor,and the maximum amount of dye adsorption is 496 mg/g;0.2 g dried hydrogel with molecular mass of 0.7 million can reach equilibrium within 4 h in 1 g/L dye liquor,and the maximum amount of dye adsorption is 465 mg/g.