摘要
采用原子力显微镜,结合自制微颗粒探针,对膜-污染物及污染物-污染物间微观作用力进行了检测分析,考察了不同p H条件下牛血清蛋白(BSA)在不同界面特性PVDF超滤膜上的膜污染行为.结果表明,在膜过滤初期,通量剧烈衰减主要由BSA和膜之间黏附力作用导致,在膜过滤后期,BSA与BSA之间的黏聚作用则是影响后期膜污染行为的主要因素;PA膜-BSA和PP膜-BSA之间的黏附作用力均大于BSA-BSA之间的黏聚作用力,说明在整个膜过滤过程中,BSA与PVDF超滤膜之间的黏附作用对膜污染起主导作用;相同p H条件下,PA膜-BSA之间的微观作用小于PP膜-BSA之间的相互作用力,说明亲水性较强的PA膜具有较强的抗污染性;而PA膜和PP膜过滤后期BSA-BSA之间黏聚力相差不大,也进一步说明膜过滤过程中膜-污染物之间的微观作用力是影响膜污染行为的主要因素.
To determine the fouling behavior of bovine serum albumin( BSA) on different hydrophilic PVDF ultrafiltration membrane over a range of p H,atomic force microscopy( AFM) and self-made colloidal probes were used to detect the microscopic adhesion forces of membrane-BSA and BSA-BSA,respectively. The results showed a positive correlation between the flux decline extent and the membrane-foulant adhesion force in the initial filtration stage,whereas the foulant-foulant interaction force was closely related to the membrane fouling in the later filtration stage. Moreover,the membrane-BSA adhesion interaction was stronger than the BSA-BSA adhesion interaction,which indicated that the fouling was mainly caused by the adhesion interaction between membrane and foulant. At the same p H,the adhesion force between PA membrane-BSA was smaller than that of PP membrane-BSA,illustrating the more hydrophilic the membrane was,the better the antifouling ability it had. The adhesion force between BSA-BSA fouled PA membrane was similar to that between BSA-BSA fouled PP membrane. These results confirmed that elimination of the membrane-BSA adhesion force is important to control the protein fouling of membranes.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第8期2900-2905,共6页
Environmental Science
基金
国家自然科学基金项目(51178378
51278408)
陕西省科技统筹创新工程计划项目(2012KTCL03-06)
陕西省科技新星项目(2014KJXX-65)
陕西省科技攻关计划项目(2013K13-01-03)
西安市工业应用技术研发项目(CXY14332)
关键词
聚偏氟乙烯
膜污染
微观作用力
蛋白质
超滤
polyvinylidene fluoride(PVDF)
membrane fouling
microscopic adhesion force
protein
ultrafiltration
