Zhang Guangyu, Li Longbiao, Huang Yan, Hozumi Atsushi, Sonoda Tsutomu, Su Zhaohui
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 P. R. China
National Institute of Advanced Industrial Science and Technology (AIST) 2266-98 Anagahora, Shimoshidami, Moriyama Nagoya 463-8560 Japan.
RSC Adv. 2018 Jan 31;8(10):5306-5311. doi: 10.1039/c7ra13605f. eCollection 2018 Jan 29.
Separation by membrane technology of oily wastewater, especially emulsified oil/water mixtures, has become a topic of intensive study in recent years, and membrane fouling remains a challenge. In this work, porous polycarbonate membranes were coated with poly(diallyldimethylammonium chloride)/polystyrene sulfonate (PDDA/PSS) multilayers the facile layer-by-layer deposition technique to improve their fouling resistance for separation of oil-in-water emulsions stabilized by ionic surfactants. The permeation flux for the virgin membrane was found to decrease by ∼90% in 10 cycles due to fouling. The membranes coated with PSS-capped PEMs were used to separate emulsions stabilized by sodium dodecyl sulfate, an anionic surfactant, whereas the ones modified with PDDA-capped PEMs were effective for separation of emulsions stabilized by cetyltrimethyl ammonium bromide, a cationic surfactant. Both retained up to 80% of their original permeation flux after 10 separation cycles. The purity of the filtrates was greater than 99.98%.
近年来，利用膜技术分离含油废水，尤其是乳化油/水混合物，已成为一个深入研究的课题，而膜污染仍然是一个挑战。在这项工作中，采用简便的层层沉积技术，用聚（二烯丙基二甲基氯化铵）/聚苯乙烯磺酸盐（PDDA/PSS）多层膜对多孔聚碳酸酯膜进行涂层处理，以提高其对由离子表面活性剂稳定的水包油乳液的抗污染性能。由于污染，发现原始膜的渗透通量在10个循环中下降了约90%。涂有PSS封端的聚电解质多层膜的膜用于分离由阴离子表面活性剂十二烷基硫酸钠稳定的乳液，而用PDDA封端的聚电解质多层膜改性的膜对由阳离子表面活性剂十六烷基三甲基溴化铵稳定的乳液的分离有效。在10次分离循环后，两者都保留了高达80%的原始渗透通量。滤液的纯度大于99.98%。
