Liu Qin, Wu Xing, Zhang Kaisong
Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Membranes (Basel). 2018 Oct 3;8(4):89. doi: 10.3390/membranes8040089.
To improve the filtration performance and properties of organic solvent nanofiltration (OSN) membranes, we firstly introduce nanoporous silica (SiO₂) particles into the polyamide (PA) active layer of polysulfone (PSf) membrane via an interfacial polymerization process. Results from the study revealed that introduction of SiO₂ influenced the properties of PSf/PA-SiO₂ composite membranes by changing the surface roughness and hydrophilicity. Moreover, results also indicated that nanoporous SiO₂ modified membranes showed an improved performance of alcohols solvent permeance. The PSf/PA-SiO₂ composite membrane modified by 0.025 wt % of SiO₂ reached a permeance of 3.29 L m h bar for methanol and 0.42 L m h bar for ethanol, which were 20.0% and 13.5% higher than the control PSf membrane (permeance of 2.74 L m h bar for methanol and 0.37 L m h bar for ethanol). Conclusively, we demonstrated that the increase of membrane hydrophilicity and roughness were major factors contributing to the improved alcohols solvent permeance of the membranes.
为了提高有机溶剂纳滤（OSN）膜的过滤性能和特性，我们首先通过界面聚合过程将纳米多孔二氧化硅（SiO₂）颗粒引入聚砜（PSf）膜的聚酰胺（PA）活性层中。研究结果表明，SiO₂的引入通过改变表面粗糙度和亲水性影响了PSf/PA-SiO₂复合膜的特性。此外，结果还表明，纳米多孔SiO₂改性膜的醇类溶剂渗透率有所提高。用0.025 wt%的SiO₂改性的PSf/PA-SiO₂复合膜，甲醇渗透率达到3.29 L m⁻² h⁻¹ bar，乙醇渗透率达到0.42 L m⁻² h⁻¹ bar，分别比对照PSf膜（甲醇渗透率为2.74 L m⁻² h⁻¹ bar，乙醇渗透率为0.37 L m⁻² h⁻¹ bar）高20.0%和13.5%。总之，我们证明了膜亲水性和粗糙度的增加是导致膜的醇类溶剂渗透率提高的主要因素。
