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应用XDLVO理论定量解析腐殖酸中不同分子质量组分在PVC和PVDF两种超滤膜污染中的界面作用,评价范德华力(LW)、极性力(AB)、静电荷作用力(EL)在腐殖酸引起的超滤膜污染中的相对贡献,确定膜污染的主要作用力。另外,取长江南京段沉后水进行臭氧氧化预处理,进一步探究XDLVO理论在实际原水膜污染中的适用性。结果表明,试验采用的PVC和PVDF膜总表面能相近,同一分子质量有机物导致两种膜污染相近;腐殖酸膜污染中AB相互作用能起主导作用,LW相互作用能次之。腐殖酸中小分子质量有机物以及臭氧氧化预处理后的长江原水,具有更强的亲水性和极性,AB、LW相互作用能降低,膜污染减轻。
XDLVO theory was used to quantitatively analyze the interfacial interaction between different molecular weight components of humic acid in two ultrafiltration membranes of PVC and PVDF. The effects of van der Waals force (LW), polar force (AB), electrostatic charge (EL) The relative contribution of humic acid-induced ultrafiltration in determining membrane fouling was the main force. In addition, the sediment after the Yangtze River in Nanjing ozone ozonation pretreatment to further explore the applicability of XDLVO theory in the actual raw water membrane pollution. The results show that the total surface energy of the PVC and PVDF membranes used in the experiment is similar, and the same molecular mass of organic matter leads to the similar pollution of the two membranes. In the humic acid membrane, the AB interaction plays a leading role and the LW interaction takes the second place. Humic acid in the small molecular weight of organic matter and ozone oxidation pretreatment of the Yangtze River water, with a stronger hydrophilic and polar, AB, LW interaction can reduce the membrane pollution reduced.