| 新型Janus膜的制备及其在高盐含油废水膜蒸馏处理中的应用 |
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| 引用本文： | 唐敏, 贾晓琳, 张勇, 李魁岭, 徐莉莉, 项军, 侯得印, 王军. 新型Janus膜的制备及其在高盐含油废水膜蒸馏处理中的应用[J]. 环境工程学报, 2020, 14(8): 2037-2047. doi: 10.12030/j.cjee.202005191 |
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| 作者姓名： | 唐敏 贾晓琳 张勇 李魁岭 徐莉莉 项军 侯得印 王军 |
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| 作者单位： | 1.中国科学院生态环境研究中心，环境水质学国家重点实验室，北京 100085; 2.中国科学院生态环境研究中心，高浓度难降解有机废水处理技术国家工程实验室，北京 100085; 3.中国科学院大学，北京 100049 |
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| 基金项目： | 国家自然科学基金资助项目(51978650，51678555) |
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| 摘 要： | 采用表面蚀刻-电喷雾协同技术制备了具有微/纳凹槽表面结构的亲水/疏水型Janus膜，并系统考察了Janus膜的脱盐性能及耐润湿、抗污染功能。Janus膜具有水相超疏油的性能，对原油、正己烷、甲苯和汽油的水下油接触角分别为152.7°、150.1°、146.7°和151.1°。直接接触式膜蒸馏应用实验表明：在连续50 h的运行过程中，Janus膜对盐的截留率可达100%、膜通量稳定在10.18 kg·(m2·h)−1；对于不同浓度(0.1、0.2和0.3 mmol·L−1等)的十二烷基硫酸钠，Janus膜均表现出优异的抗润湿效果。在处理高盐含油废水过程中，Janus膜未发生膜润湿和膜污染的现象，膜通量及盐截留率也保持稳定；油滴力学探针测试结果定量阐释了Janus膜强健的抗油污能力。制备的新型Janus膜兼具耐润湿与抗污染特性，拓展了膜蒸馏技术在高浓度难降解废水处理领域的应用。
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| 关 键 词： | 膜蒸馏 Janus膜 耐润湿 抗污染 |
| 收稿时间： | 2020-05-29 |
Development of a novel Janus membrane and its application in treatment of hypersaline oily wastewater by direct contact membrane distillation |
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| TANG Min, JIA Xiaolin, ZHANG Yong, LI Kuiling, XU Lili, XIANG Jun, HOU Deyin, WANG Jun. Development of a novel Janus membrane and its application in treatment of hypersaline oily wastewater by direct contact membrane distillation[J]. Chinese Journal of Environmental Engineering, 2020, 14(8): 2037-2047. doi: 10.12030/j.cjee.202005191 |
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| Authors: | TANG Min JIA Xiaolin ZHANG Yong LI Kuiling XU Lili XIANG Jun HOU Deyin WANG Jun |
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| Affiliation: | 1.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 2.National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | A novel hydrophilic-hydrophobic Janus membrane was developed through constructing a hydrophilic layer on an omniphobic substrate via electrospraying. The anti-wetting and anti-fouling performances associated with the fabricated Janus membrane during membrane distillation (MD) of hypersaline wastewater was systematically investigated. The results of SEM, ATR-FTIR and XPS indicated that the micro-nano reentrant structures were successfully constructed in the Janus membrane, and the anti-wettability of the Janus membrane was obviously enhanced. The experiments reflected that the Janus membrane was underwater superoleophobic, with the underwater contact angles for crude oil, n-hexane, toluene and gasoline being of 152.7°, 150.1°, 146.7° and 151.1°, respectively. The anti-wetting and anti-fouling performances were verified via the MD experiments. The Janus membrane maintained the salt rejection of about 100% with a stable permeate flux of 10.18 kg·(m2·h)−1 in the MD process for 50 h. Meanwhile, the Janus membrane showed excellent anti-wetting performance when treating hypersaline wastewaters with sodium dodecyl sulfonate as high as 0.3 mmol·L−1. During DCMD processing of hypersaline oily wastewater, no wetting and fouling phenomena happened on the Janus membrane. Additionally, the oil-droplet probe test further quantitatively verified the strong oil resistance of the developd Janus membrane. In conclusion, the fabricated Janus membrane had great potential to promote MD dealing with challenging wastewaters enriched with salts and hydrophobic organics, owning to its robust anti-wetting and anti-fouling performances. |
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| Keywords: | membrane distillation Janus membrane anti-wetting anti-fouling |
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