摘要
采用聚偏氟乙烯(PVDF)中空纤维超滤膜,进行了耐化学性能研究,初步制定了耐酸性、耐碱性、耐氧化性检测方法。确定耐酸性、耐碱性、耐氧化性用4个指标来衡量:外观变化,断裂强度变化率、纯水通量变化率、截留率变化率。结果表明,PVDF膜的耐酸性最好,其次是耐氧化性,耐碱性最差。250 mg/L的次氯酸钠溶液中浸泡后,PVDF膜的最大孔径几乎不变化,纯水通量增加了20%,截留率也几乎不变化;而500、1 000 mg/L的次氯酸钠溶液中浸泡后,PVDF膜的最大孔径均有所增大,纯水通量均减少了50%以上,而截留率均变化不大。PVDF膜分别经相同质量浓度的Na Cl O溶液和H2O2溶液浸泡处理后,断裂强度变化率、纯水通量变化率和截留率变化率均相当接近,只有最大孔径变化率有所差别。
The chemical resistance of polyvinylidene fluoride （PVDF） hollow fiber ultrafiltration membrane was studied and a test method for the chemical resistance of hollow fiber ultrafiltration membranes was initially established. Four evaluation indexes including appearance change, tensile strength change rate, flux change rate and rejection change rate were selected to measure acid resistance, alkali resistance and oxidation resistance of ultrafiltration membranes. The results showed that PVDF membrane exhibited better resistance to acid and oxidation than to alkali. It was found that maximum pore size and rejection rate changed little while the water flux of PVDF membrane increased by 20% after treatment in 250 mg/L NaCIO solution. As the concentration of NaC10 solution increased to 500 and I 000 mg/L respectively, maximum pore size enlarged somewhat and rejection rate changed little while the water flux of PVDF membrane decreased by 50%. Through soaking treatment of PVDF membrane in NaC10 solution and H202 solution ofsame mass concentration respectively, it was found that tensile strength change rate, flux change rate and rejection change rate werc extremely close although change rate of maximum pore size was different.
出处
《水处理技术》
CAS
CSCD
北大核心
2015年第8期44-47,52,共5页
Technology of Water Treatment
基金
国家海洋局海洋公益性行业科研专项项目(201105025)
浙江省省级重点实验室建设项目(2012E10001)
关键词
中空纤维超滤膜
PVDF
耐化学性
变化率
hollow fiber ultrafiltration membrane
PVDF
chemical resistance
change rate
