膜科学与技术

底膜对PEG/PVDF复合膜脱硫性能的影响

作者：张杏梅，赵宇航，李学坤，蔡采彬，韩小龙

单位：西安文理学院化学工程学院，西安 710065；西北大学化工学院，西安 710069

关键词： PEG/PVDF复合膜；渗透汽化；脱硫

出版年,卷(期):页码： 2021,41(2):56-62

摘要：

选用N-甲基吡咯烷酮、N,N-二甲基乙酰胺和磷酸三乙酯三种不同溶剂，采用浸没沉淀相转化法制备出三种不同孔径的PVDF超滤膜，刮涂PEG后制得PEG/PVDF复合膜。采用扫描电子显微镜（SEM）、红外光谱（FTIR）、X射线衍射（XRD）等对底膜与复合膜的形貌、官能团和结晶度进行分析。计算了PVDF底膜的孔尺寸和孔隙率，测试了底膜的超滤性能和PEG/PVDF复合膜的脱硫性能。结果表明，底膜对PEG/PVDF复合膜脱硫性能的影响很大，与N-甲基吡咯烷酮和N,N-二甲基乙酰胺相比，选用磷酸三乙酯作溶剂时制备的PVDF超滤膜最适合做支撑底膜，复合膜的脱硫性能最好。

In this paper, three kinds of PVDF ultrafiltration membrane with different pore size were prepared by phase inversion method using N-methylpyrrolidone, N, N-dimethylacetamide and triethyl phosphate as the solvents, and then the PEG/PVDF composite membranes were prepared by kinfie coating PEG solution. Scanning electron microscope (SEM), infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to characterize the surface and cross-section morphologies, functional groups, and crystallinity of the suppoting and the composite membrane, respectively. In addition, the pore size and porosity of the PVDF membrane were calculated and the desulfurization performance of the PEG/PVDF composite membranes were tested. The results indicate that the PVDF supporting membranes have great effect on the desulfurization performance of the PEG/PVDF composite membranes. Compared with N-methylpyrrolidone and N, N-dimethylacetamide, triethyl phosphate is more suited as phase conversion solvent to prepare the PVDF supporting membrane, and accordingly the prepared PEG/PVDF composite membrane has best desulfurization performance.

张杏梅（1975-），陕西大荔人，博士，副教授，研究方向为膜分离技术。 E-mail:zhxm_v@163.com.

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