以骨胶为基材,戊二醛为交联剂,添加调孔剂(由水、异丙醇、异丙醇铝、硝酸组成),制备了一种可调节孔隙大小的三维网络结构水凝胶。考察了调孔剂含量为1%、2%、3%时,水凝胶对重金属离子(Cr2O72-、Ni2+、Cu2+)的吸附性能。结果表明:当调孔剂含量为2%时,水凝胶吸附性能最好,对Cr2O72-、Ni2+和Cu2+最大吸附平衡浓度分别为276mg/g、321mg/g和218mg/g;吸附动力学拟合和吸附等温模型拟合表明,水凝胶对Cr2O72-的吸附过程符合伪二级动力学模型,属于单层化学吸附;对Ni2+和Cu2+的吸附过程符合伪一级动力学模型,属于单层物理吸附。
Using bone glue as the matrix,glutaraldehyde as the cross-linking agent and adding pore-regulating agent (composed of water,isopropyl alcohol,aluminum isopropyl alcohol and nitric acid),a three-dimensional network structure hydrogel with adjustable pore size was prepared.The adsorption properties of hydrogel for heavy metal ions (Cr2O72-,Ni2+,Cu2+) were investigated when the content of pore-adjusting agent was 1%,2% and 3%.The results showed that when the content of pore-adjusting agent was 2%,the adsorption performance of hydrogel was the best,and the maximum adsorption equilibrium concentrations of Cr2O72-,Ni2+ and Cu2+ were 276mg/g,321mg/g and 218mg/g,respectively.The adsorption kinetics fitting and adsorption isothermal model fitting showed that the adsorption process of Cr2O72- by hydrogel was consistent with the pseudo-second-order kinetic model,which belonged to monolayer chemisorption.The adsorption process of Ni2+and Cu2+ conformed to the pseudo-first-order kinetic model,which belonged to monolayer physical adsorption.
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