Longjun Wang, Yonggang Li, Jingwen Zhou, Zhuolin Han, Pengcheng Liu, Xiquan Cheng and Kai Wang
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Finally, the HDT-Cu-PDA-CM superhydrophobic composite film was prepared <em>via</em> the coordination reaction of alkyl mercaptan (HDT) and a metal to realize the grafting of low surface energy substances. Results indicated that the surface roughness of the ceramic membrane increased from 2.7576 μm to 3.4913 μm after introducing Cu NPs. The water contact angle (WCA) of the modified HDT-Cu-PDA-CM composite membrane was 152°, and the separation efficiency of water-in-oil emulsions (<em>n</em>-octane, dichloromethane and toluene) was above 99%. Kinetic analysis of the membrane contamination showed that HDT-Cu-PDA-CM ceramic membrane exhibited strong resistance to contamination. After solvent resistance tests in different organic solvents and acidic and alkaline wastewaters, HDT-Cu-PDA-CM ceramic membrane maintained its superhydrophobicity, emulsion separation efficiency to more than 99%, and excellent solvent resistance. This study offers a novel strategy for the hydrophobic modification of a CM surface using dopamine by <em>in situ</em> reducing the metal nanoparticles on the surface of CM to increase its roughness, followed by grafting alkyl mercaptan.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 7","pages":" 1681-1690"},"PeriodicalIF":3.1000,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"In situ dopamine-driven copper nanoparticle-/thiol-modified superhydrophobic ceramic membranes for oil–water separation and membrane contamination control†\",\"authors\":\"Longjun Wang, Yonggang Li, Jingwen Zhou, Zhuolin Han, Pengcheng Liu, Xiquan Cheng and Kai Wang\",\"doi\":\"10.1039/D5EW00159E\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >To achieve efficient separation of water-in-oil emulsions and to mitigate the issue of easy contamination of conventional ceramic membranes (CMs), modifying CM surface from being hydrophilic to being superhydrophobic is a feasible strategy, thereby improving the separation selectivity and anti-fouling ability of CM. 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引用次数: 0
摘要
为了实现油包水乳状液的高效分离,缓解传统陶瓷膜易污染的问题,将陶瓷膜表面由亲水性修饰为超疏水性是一种可行的策略,从而提高陶瓷膜的分离选择性和抗污染能力。在本研究中,利用多巴胺(DA)在各种基底表面的自聚合和粘附特性,在陶瓷膜表面涂覆了聚多巴胺(PDA)涂层。利用DA的还原性,将铜离子(Cu2+)原位还原为铜纳米粒子(Cu NPs),在CM表面构建微观结构。最后,通过烷基硫醇(HDT)与金属的配位反应制备了HDT- cu - pda - cm超疏水复合膜,实现了低表面能物质的接枝。结果表明:Cu NPs的引入使陶瓷膜的表面粗糙度由2.7576 μm提高到3.4913 μm;改性HDT-Cu-PDA-CM复合膜的水接触角(WCA)为152°,对正辛烷、二氯甲烷和甲苯等油包水乳液的分离效率达到99%以上。膜污染动力学分析表明,HDT-Cu-PDA-CM陶瓷膜具有较强的抗污染能力。经过在不同有机溶剂和酸碱废水中的耐溶剂性测试,HDT-Cu-PDA-CM陶瓷膜保持了超疏水性,乳液分离效率达99%以上,具有优异的耐溶剂性。本研究提供了一种利用多巴胺原位还原CM表面的金属纳米颗粒以增加其粗糙度的新策略,然后接枝烷基硫醇。
In situ dopamine-driven copper nanoparticle-/thiol-modified superhydrophobic ceramic membranes for oil–water separation and membrane contamination control†
To achieve efficient separation of water-in-oil emulsions and to mitigate the issue of easy contamination of conventional ceramic membranes (CMs), modifying CM surface from being hydrophilic to being superhydrophobic is a feasible strategy, thereby improving the separation selectivity and anti-fouling ability of CM. In this study, using dopamine's (DA) self-polymerization and adhesive qualities on various substrate surfaces, a polydopamine (PDA) coating was applied to a ceramic membrane's surface. Using the reducibility of DA, copper ions (Cu2+) were reduced to copper nanoparticles (Cu NPs) in situ to construct microstructures on the surface of CM. Finally, the HDT-Cu-PDA-CM superhydrophobic composite film was prepared via the coordination reaction of alkyl mercaptan (HDT) and a metal to realize the grafting of low surface energy substances. Results indicated that the surface roughness of the ceramic membrane increased from 2.7576 μm to 3.4913 μm after introducing Cu NPs. The water contact angle (WCA) of the modified HDT-Cu-PDA-CM composite membrane was 152°, and the separation efficiency of water-in-oil emulsions (n-octane, dichloromethane and toluene) was above 99%. Kinetic analysis of the membrane contamination showed that HDT-Cu-PDA-CM ceramic membrane exhibited strong resistance to contamination. After solvent resistance tests in different organic solvents and acidic and alkaline wastewaters, HDT-Cu-PDA-CM ceramic membrane maintained its superhydrophobicity, emulsion separation efficiency to more than 99%, and excellent solvent resistance. This study offers a novel strategy for the hydrophobic modification of a CM surface using dopamine by in situ reducing the metal nanoparticles on the surface of CM to increase its roughness, followed by grafting alkyl mercaptan.
期刊介绍:
Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.