摘要
为了赋予PVDF膜高的渗透通量和优秀的抗污染性能,以商品用PVDF膜为基膜,对其表面进行碱化处理和丙烯酸聚合以构建丰富的羧基活性位点,然后在多肽缩合剂作用下通过酰胺键接枝聚乙烯亚胺(PEI),用1,3-丙烷磺酸内酯(1,3-PS)与PEI中的叔胺基团间的开环反应制备出超亲水和优秀抗污染性能的两性离子化功能层。采用衰减全反射红外光谱(ATR-FTIR)和X-光电子能谱(XPS)对改性过程进行跟踪分析,利用水接触角(WCA)对膜表面亲水性能进行表征分析,通过错流过滤含油废水实验对膜的分离性能和抗污染性能进行测试和评价。结果表明:制备的两性离子化功能层被成功修饰在PVDF膜表面,膜亲水性得到明显的提高(水接触角从原膜117°降到39°),改性PVDF膜具有高的渗透通量(纯水通量从原膜的396.8 L/(m^2·h)提高到635.1 L/(m^2·h))、优异的抗污染性能(通量可恢复性从原PVDF膜的34.6%提高到79.1%)和高效的油水分离性能(121.8 L/(m^2·h)水渗透通量和92.0%油污染物截留率)。该改性膜在含油废水处理领域具有良好的潜在应用前景。
To make poly(vinylidene fluoride)(PVDF) membrane have high permeation flux and excellent anti-pollution property, commercial PVDF membrane was used as the base membrane, and alkaline treatment and acrylic polymerization of the membrane surface to construct rich carboxyl active sites. Then, the zwitterionic functional layer with super-hydrophilic property and excellent anti-pollution property was prepared by ring-opening reaction between 1,3-propane sultone(1,3-PS) and tertiary amine group in PEI through amido bond grafting of polyethyleneimine(PEI) under the action of polypeptide condensing agent. The modification process was analyzed by Attenuated total reflectance-Fourier transform infrared spectroscopy(ATR-FTIR) and X-ray photoelectron spectroscopy(XPS). Hydrophilicity of membrane surface was characterized by water contact angle(WCA). Membrane separation and anti-fouling properties were evaluated via cross-flow filtration of oily wastewater. The results showed that the zwitterionic function layer was successfully modified on the membrane surface and the hydrophilicity of PVDF membrane was improved significantly(the WCA decreased from 117° to 39°). The modified PVDF membrane had a high permeation flux(rose to 635.1 L/(m^2·h) from396.8 L/(m^2·h)), excellent anti-fouling property(flux recovery ratio rose to79.1% from 34.6%),and efficient oil/water separation performance(water permeation flux 121.8 L/(m^2·h) and retention rate of oil pollutants 92.0%). The modified membrane has good potential application prospects in the field of oily wastewater treatment.
作者
胡峰
陈锋涛
俞三传
HU Feng;CHEN Fengtao;YU Sanchuan(School of Science,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2020年第6期774-780,共7页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
浙江省重点研发计划项目(2020C03081)
浙江理工大学科研启动基金项目(18062306-Y)。
关键词
PVDF膜
表面改性
两性离子化
抗污染
亲水性
PVDF membrane
surface modification
zwitterionic modification
anti-fouling
hydrophilicity
