摘要
以溶液相转化法制备PVA共混PVDF超滤膜,考察了戊二醛(GA)化学交联反应程度对PVDF/PVA共混超滤膜界面性质、微观构造及其抗污染性能的影响。结果表明:适度的交联反应有利于提高共混膜的机械强度;与超滤膜表面相比,GA交联对PVDF/PVA共混膜内部结构影响甚微; GA交联反应程度过高,会造成PVDF/PVA共混膜表面结构趋于致密,通量下降,但蛋白质截留能力提高,透水稳定性增强; GA交联能有效防止BSA在PVDF/PVA膜面的堵塞污染,减缓BSA过滤过程中的比通量下降率,提高通量恢复率,增强抗污染能力。但GA交联度的选择与PVDF/PVA共混膜组成有关:当原膜结构疏松且PVA含量较低时,宜选择较低浓度的GA溶液且交联时间不宜过长;而原膜结构较为致密且PVA含量较高时,提高GA浓度和增加交联反应时间,则有利于膜内部PVA得到交联,以保证膜结构的稳定性。
The PVA blend PVDF uhrafihration membrane was prepared by solution phase transfor- mation, and the effect of the degree of chemical crosslinking reaction of glutaraldehyde （GA） on the in- terfacial properties, microstructure and anti-fouling properties of the PVDF/PVA blend ultrafiltration membrane was investigated. The results showed that proper crosslinking reaction could improve the me- chanical strength of blend membranes. Compared with the surface structure of the ultrafiltration mem- brane, GA crosslinking reaction had little effect on the internal structure of the PVDF/PVA blend mem- branes. The high degree of crosslinking reaction of GA leaded to the densification of the surface structure of the PVDF/PVA blend membrane and the decrease of flux, while the retention ability of protein was increased and the stability of water permeable was enhanced. GA crosslinking could effectively prevent the BSA from blocking pollution on the PVDF/PVA membrane surface, decrease the specific flux in the BSA filtration process, increase the flux recovery, and enhance the anti-fouling ability. However, the selection of GA crosslinking degree was related to the composition of PVDF/PVA blend membrane. When the structure of the original membrane was loose and the content of PVA was relatively low, it needed to choose a lower concentration of GA solution and the crosslinking time should not be too long. When the structure of the original membrane was more compact and the content of PVA was high, the increase of the concentration of GA and the crosslinking time were beneficial to crosslink PVA into the membrane, making the membrane structure more stable.
作者
廖正伟
贺酰淑
宋锦峰
孟晓荣
LIAO Zheng-wei;HE Xian-shu;SONG Jin-feng;MENG Xiao-rong(Shaanxi Water Affairs Group Water Science ＆ Technology Co.Ltd.,Xi＇an 710004,China;Key Laboratory of Membrane Separation of Shaanxi Province,Xi＇an 710055,China;School of Science,Xi＇an University of Architecture and Technology,Xi＇an 710055,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第19期23-29,共7页
China Water & Wastewater
基金
陕西省重点产业链(群)项目(2017ZDCXL-GY-07-03)
陕西省教育厅专项研究计划项目(2013JK0975)
关键词
超滤膜
PVDF/PVA共混膜
戊二醛
化学交联
ultrafihration membrane
PVDF/PVA blend membrane
glutaraldehyde
chemical crosslinking
