摘要
以聚碳酸酯(PC)为基础超滤膜材料、聚乙烯吡咯烷酮为致孔剂,与醋酸纤维素(CA)共混后,使用浸没沉淀相转化法制备了一系列聚碳酸酯/醋酸纤维素共混超滤膜(CPCM1~4)。通过FTIR、接触角测定仪、SEM对纯聚碳酸酯超滤膜(PCM1~6)和CPCM进行了表征,测试了超滤膜的总孔隙率和平均孔半径,考察了制备条件对膜性能的影响。结果表明,CA成功地与PC共混;随着CA质量分数的增大,CPCM的指状孔通道层逐渐变厚,空腔变大,致密层的孔洞变大,孔道间的连通孔增多;未添加CA的PCM5的平均孔半径为23.3 nm,添加质量分数为2.0%CA的CPCM4的平均孔半径为42.5 nm,比PCM5增大了82.4%。CPCM的纯水通量(J_(w))远高于PCM,最高达357.7 L/(m^(2)·h);牛血清蛋白(BSA)截留率相较于PCM膜略有降低,但仍>95%(CPCM2)。综合CPCM的纯水通量、BSA截留率、通量恢复率,添加CA质量分数为1.0%的CPCM2综合性能最好,J_(w)为334.3 L/(m^(2)·h),BSA截留率为95.9%,两轮通量恢复率分别为84.8%、76.7%。CA的添加显著提升了PC膜表面的亲水性,从而增强了其超滤性能。
A series of polycarbonate(PC)/cellulose acetate(CA)blended ultrafiltration membranes(CPCM 1~4)were prepared by immersion precipitation phase inversion method using PC as base ultrafiltration membrane and polyvinylpyrrolidone as pore-forming agent.The pure PC ultrafiltration membrane(PCM 1~6)and CPCM were the characterized by FTIR,contact angle tester and SEM.The total porosity and average pore radius of then ultrafiltration membranes were measured,and the effect of preparation conditions on the membrane properties were evaluated.The results showed that CA was successfully blended with PC.With the increase of CA mass fraction,the finger-like pore channel layer in CPCM gradually became thicker,the cavity became larger,the pores in the dense layer became larger,and the connected pores between the pores increased.The average pore radius of PCM5 without CA was 23.3 nm,while the average pore radius of CPCM4 with 2.0%mass fraction of CA was 42.5 nm,82.4%higher than that of PCM5.The pure water flux(J_(w))of CPCM was up to 357.7 L/(m^(2)·h),much higher than that of PCM5.The retention rate of bovine serum albumin(BSA)was slightly lower than that of PCM membrane,but still above 95%(CPCM2).According to the results of pure water flux,BSA rejection rate and flux recovery rate of CPCM,the comprehensive performance of CPCM2 with 1.0%mass fraction of CA showed the best performance,with J_(w)of 334.3 L/(m^(2)·h),BSA rejection rate of 95.9%,and the recovery rates of the two rounds of 84.8%and 76.7%,respectively.The addition of CA significantly improved the hydrophilicity of PC membrane surface,thus enhancing its ultrafiltration performance.
作者
杨镠巾
丁凯琪
张馨月
尹学琼
YANG Liujin;DING Kaiqi;ZHANG Xinyue;YIN Xueqiong(Hainan Provincial Fine Chemical Engineering Research Center,Hainan University,Haikou 570228,Hainan,China)
出处
《精细化工》
北大核心
2025年第10期2158-2164,2173,共8页
Fine Chemicals
基金
海南省重大科技计划项目(ZDKJ2021043)。
关键词
超滤膜
聚碳酸酯
共混改性
醋酸纤维素
亲水性
功能材料
ultrafiltration membranes
polycarbonate
blending modification
cellulose acetate
hydrophilicity
functional materials
