Laboratory for Membrane Materials and Separation Technology, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China.
Water Res. 2013 Apr 15;47(6):2065-74. doi: 10.1016/j.watres.2013.01.032. Epub 2013 Jan 30.
A high performance versatile composite hollow fiber nanofiltration (NF) membrane is reported for the separation of glyphosate from saline waste streams. Preparation of SPEEK based on an amorphous poly (ether ether ketone, PEEK) was investigated. The membrane was prepared by coating sulfonated polyether ether ketone (SPEEK) onto a polyethersulfone (PES) ultrafiltration (UF) hollow fiber membrane. The composite membrane was characterized by water permeability, scanning electron microscopy, and rejection toward sodium sulfate (Na₂SO₄), sodium chloride (NaCl), and calcium chloride (CaCl₂). About 90% rejection toward sulfate anions and only 10% rejection for calcium cations were obtained. A water permeability around 10-13 LMHBar and 90% rejection for polyethylene glycol (PEG) with a molecular weight of 4000-6000 Da were observed. In the separation of glyphosate from saline wastewater, the membrane rejected less than 20% of NaCl and higher than 90% of glyphosate at an operating pressure of 5 bars and pH = 11.0. An economic analysis indicated that the cost for recovery of glyphosate was comparably low to the value gained by an increase in the productivity. The results may lead to a new promising low energy solution for the environmental problem faced by the herbicide industry.
一种高性能多功能复合中空纤维纳滤（NF）膜被报道用于从盐废水中分离草甘膦。研究了基于无定形聚醚醚酮（PEEK）的 SPEEK 的制备。该膜是通过将磺化聚醚醚酮（SPEEK）涂覆到聚醚砜（PES）超滤（UF）中空纤维膜上制备的。通过水渗透性、扫描电子显微镜和对硫酸钠（Na₂SO₄）、氯化钠（NaCl）和氯化钙（CaCl₂）的截留率对复合膜进行了表征。硫酸盐阴离子的截留率约为 90%，而钙离子的截留率仅为 10%。观察到水渗透性约为 10-13 LMHBar，对分子量为 4000-6000 Da 的聚乙二醇（PEG）的截留率为 90%。在从盐废水中分离草甘膦的过程中，在操作压力为 5 巴和 pH = 11.0 的条件下，该膜对 NaCl 的截留率低于 20%，而对草甘膦的截留率高于 90%。经济分析表明，草甘膦的回收成本与提高生产力所带来的收益相当。这些结果可能为除草剂行业面临的环境问题提供一种有前途的低能耗解决方案。
