双凝固浴条件下TiO2/PVDF-g-PEGMA/PVDF膜的制备及性能
Preparation and Properties of TiO2/PVDF-g-PEGMA/PVDF Membrane under Double Coagulation Bath Conditions
张献坤 1唐玉兰 1周东锐 1何亚婷 1孙先源 1齐琬羽1
作者信息
- 1. 沈阳建筑大学市政与环境工程学院,辽宁沈阳 110168
- 折叠
摘要
将TiO2 和两亲聚合物PVDF-g-PEGMA一起加入铸膜液中,以乙醇溶液为第 1 凝固浴,利用其较高的成孔能力使改性膜表面生成大量孔洞,之后将改性膜放入第 2 凝固浴中,利用NaCl溶液对膜孔生长的抑制作用,制备孔隙率高、孔洞较小的亲水性TiO2/PVDF-g-PEGMA/PVDF超滤膜.试验结果表明,第 1 凝固浴乙醇溶液质量分数为 20%时,随着第 2 凝固浴NaCl溶液浓度的升高,α晶相的生长受到抑制,β晶相数量占比增大,表面粗糙度出现下降,改性膜的抗污染性能增强.试验中,M2凝固浴条件(20%乙醇溶液,20 g/L NaCl溶液)下制备的改性膜性能最好,孔隙率达到 1.94%,海藻酸钠截留试验中膜通量和截留率分别为288 L/(m2·h)和68.08%;跨膜压力为10 psi(0.07 MPa)时的纯水通量和通量恢复率分别为1 862 L/(m2·h)和76.25%,较M0(仅 20%乙醇溶液)均有所提高,trade-off效应得以缓解,牛血清蛋白吸附量下降到 961.56 μg/cm2,抗污染性能升高.
Abstract
TiO2 and PVDF-g-PEGMA amphiphilic polymer were added into the casting solution together,and ethanol solution was used as the first coagulation bath.With its high pore-forming ability,a large number of holes were formed on the surface of the modified membrane.Then,the modified membrane was put into the second coagulation bath of NaCl solution,and the growth of membrane pores was inhibited by NaCl solution,a hydrophilic TiO2/PVDF-g-PEGMA/PVDF UF membrane with high porosity and small pores was prepared.Results showed that when the content of ethanol solution in the first coagulation bath was 20%,with the increased of NaCl solution concentration in the second coagulation bath,α the growth of crystalline phase was inhibited,β the proportion of crystalline phase increased,the surface roughness decreased,and the anti-pollution performance of the modified film increased.In the experiment,the modified membrane prepared under the condition of M2 coagulation bath(20%ethanol solution,20 g/L NaCl solution)had the best performance,porosity of 1.94%.In the SA retention test,membrane flux and retention of 288 L/(m2·h)and 68.08%.When the transmembrane pressure was 10 psi(0.07 MPa),pure water flux and flux recovery rate of 1 862 L/(m2·h)and 76.25%,respectively,which were improved compared with M0(only 20%ethanol solution).The trade-off effect was alleviated,BSA adsorption capacity decreased to 961.56 μg/cm2,and anti-pollution performance was improved.
关键词
双凝固浴/聚偏氟乙烯(PVDF)/超滤膜/PVDF-g-PEGMA/trade-off效应/无机-有机杂化膜Key words
double coagulation bath/PVDF/UF membrane/PVDF-g-PEGMA/trade-off effect/inorganic-organic hybrid membrane引用本文复制引用
基金项目
辽宁省民生科技计划(2021JH2/10100003)
出版年
2024
国家科技期刊平台
NSTL
万方数据