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选用2款海水淡化反渗透商品膜SWC5和SWC6,进行p H为1和13的酸碱溶液处理,对处理后的膜组成、形貌结构和分离性能进行了分析测试。红外结果显示,SWC5和SWC6膜酸碱处理膜表面芳香酰胺特征峰与原膜相比有不同程度的减小,证明分离层酰胺键发生了不同程度的水解。元素分析表明,酸碱处理膜酰胺键部分水解后产生的-COOH或-COO-引起氧含量升高,其中SWC5膜可能受碱水解作用影响最大。SWC5酸碱处理后膜表面粗糙度升高,而SWC6酸碱处理膜表面峰谷结构更趋于平坦。SWC6膜表面酸碱处理后水接触角变化很小;而SWC5碱处理后水接触角显著下降。2款酸碱处理膜截留率的变化均小于1.0%,但水通量变化程度不同。总体上SWC6膜的耐酸碱性能优于SWC5膜。
Two kinds of desalinated reverse osmosis membrane SWC5 and SWC6 were selected for the acid-base treatment with p H of 1 and 13, and the membrane composition, morphology and separation performance were analyzed and tested. Infrared results show that SWC5 and SWC6 film acid-base membrane surface aromatic amide peaks compared with the original film has decreased to varying degrees, the separation layer amide bond was different degrees of hydrolysis. Elemental analysis showed that -COOH or -COO- produced by partial hydrolysis of acid-base membrane amide bonds caused the oxygen content to increase, and SWC5 membrane was probably the most affected by alkali hydrolysis. After SWC5 acid-base treatment, the surface roughness of the membrane increased, while the surface peak-valley structure of SWC6 acid-base treatment film tended to be flat. SWC6 membrane surface acid-base treatment of water contact angle change is small; and SWC5 alkali treatment water contact angle decreased significantly. The change of rejection of 2 acid-base films was less than 1.0%, but the degree of change of water flux was different. Overall, the acid and alkali resistance of SWC6 film is better than that of SWC5 film.