分别选用NF90,NF270和NF-纳滤膜测定了21种酚类物质的截留率,研究了纳滤膜对酚类物质的截留机理.试验结果表明,酚类物质的截留率受到酚类取代基位置和膜特性的影响:截留率从大到小的次序为邻位取代＞间位取代＞对位取代;孔径越小、荷电量越大的纳滤膜截留率越大.此外,在MATLAB6.5环境下,利用遗传算法(GA)结合偏最小二乘回归(PLS)和人工神经网络(ANN)建立了酚类化合物的截留率与其定量结构关系的模型,两种方法建立的模型的相关系数可分别达到0.886 9和0.993 7.进而结合定量构效关系模型,从有机物分子结构参数的角度分析了影响酚类物质截留率的因素,并对几种物质的截留率进行了有效的预测.从预测结果来看,GA-ANN模型的预测精度要好于GA-PLS模型.
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