负载Ag^+氧化铝陶瓷膜的制备及其对角鲨烯、花生四烯酸和二十碳五烯酸的吸附特性

Preparation of Ag^+-SACM for the adsorption of squalene,arachidonic acid and eicosapentaenoic acid

以多孔氧化铝陶瓷膜(ACM)为支撑体,经硅烷化后浸渍AgNO_3溶液,制备得到了负载Ag^+的氧化铝陶瓷膜(Ag^+-SACM),并对其结构和性质进行了表征;分别考察角鲨烯、花生四烯酸(ARA)及二十碳五烯酸(EPA)在Ag^+-SACM上的吸附性能。结果显示:Ag^+-SACM对3种化合物的吸附过程分为两阶段,第一阶段吸附速率较快,吸附行为符合Langmuir等温吸附模型;经拟合,Ag^+-SACM对角鲨烯、ARA和EPA的平衡吸附量(0℃)分别为369、322.58和990.1μmol/m2,Ag^+-SACM对EPA的吸附性能明显优于角鲨烯和ARA。这可能与其不饱和双键数和双键结构有关;乙酸丁酯对EPA-Ag^+-SACM具有较好的洗脱能力,在优化的条件下(70℃、75 min),EPA的洗脱率可达90.1%。

In this work,alumina ceramic membrane（Ag＋- SACM） was prepared with porous alumina as support material,by means of silanization modification and soaked with AgNO3 solution.The structure and properties of the modified Ag＋-SACM was then characterized.Furthermore,the adsorption of Ag＋-SACM toward squalene, arachidonic acid （ ARA） and eicosapentaenoic acid（EPA） were assessed.The adsorption process of Ag＋-SACM toward these three compounds has two stages.In the first stage,the adsorption rate was faster and the adsorption behaviors follow the Langmuir isotherm model.The results showed that the equilibrium adsorption capacity （ below 0 ℃）of Ag＋-SACM toward squalene, ARA and EPA was 369,322. 58,and 990. 1 pmol/m2, respectively.Because the number of unsaturated double bonds in EPA is higher than that in ARA and without methyl groups substitution,the loading capacity of EPA is higher than that of ARA and squalene. Finally,the EPA on Ag＋-SACM was eluted with butyl acetate. Under the optimal conditions of 70 ℃ for 75 min,the elution rate of EPA reached 90. 1%.