State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2010;22(9):1335-41. doi: 10.1016/s1001-0742(09)60259-x.
The feasibility of employing nanofiltration for the removal of chromium (VI) from wastewater was investigated. Poly (m-phenylene isophthalamide) (PMIA) was used to fabricate asymmetric nanofiltration membrane through the phase-inversion technique. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to characterize the obtained membrane, and the both confirmed a much smoother surface which could reduce membrane fouling. The PMIA membrane showed different rejections to electrolytes in a sequence of Na2SO4 > MgSO4 > NaCl > MgCl2, which was similar to the sequence of the negatively charged nanofiltration membranes. Separation experiments on chromium(VI) solution were conducted at various operating conditions, such as feed concentration, applied pressure and pH. It is concluded that chromium(VI) could be effectively removed from chromium-containing wastewater by the PMIA nanofiltration membranes while maintaining their pollution resistance under alkaline condition.
研究了采用纳滤法从废水中去除六价铬的可行性。通过相转化技术，使用聚间苯二甲酰间苯二胺（PMIA）制备了不对称纳滤膜。扫描电子显微镜（SEM）和原子力显微镜（AFM）用于表征所得的膜，两者均证实了更为光滑的表面，这可以减少膜污染。PMIA 膜对电解质的截留率顺序为 Na2SO4 > MgSO4 > NaCl > MgCl2，与带负电荷的纳滤膜的顺序相似。在不同的操作条件下，如进料浓度、施加压力和 pH 值，对含铬（VI）溶液进行了分离实验。结果表明，在碱性条件下，PMIA 纳滤膜可以有效地去除含铬废水中的六价铬，同时保持其抗污染性。
