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首页> 外文期刊>Environmental Science & Technology >Tailoring Polyamide Rejection Layer with Aqueous Carbonate Chemistry for Enhanced Membrane Separation: Mechanistic Insights, Chemistry-Structure-Property Relationship, and Environmental Implications
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Tailoring Polyamide Rejection Layer with Aqueous Carbonate Chemistry for Enhanced Membrane Separation: Mechanistic Insights, Chemistry-Structure-Property Relationship, and Environmental Implications

机译：用碳酸盐水溶液定制聚酰胺排斥层，以增强膜分离：机理见解，化学-结构-性质关系和环境影响

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摘要

Surface roughness and the associated nanosized voids inside the roughness structures have great influence on the separation performance of thin film composite polyamide reverse osmosis (RO) membranes. Inspired by the recent findings that these voids are formed due to the degassing of CO2 nanobubbles during interfacial polymerization, we systematically investigated the role of carbonate chemistry, particularly the solubility of CO2, in the aqueous m-phenylenediamine (MPD) solution for the first time. "Ridge-and-valley" roughness features were obtained when the pH of the MPD solution was between the two acidity constants of the carbonate system (i.e., 6.3 <= pH <= 10.3), under which condition HCO3- dominates over the other carbonate species. Increasing pH over this range led to both increased water permeability and better rejection of various solutes, thanks to the simultaneously enhanced effective filtration area and cross-linking degree of the polyamide layer. Further increase of pH to 12.5 resulted in more disparate rejection results due to membrane hydrolysis: rejection of neural solutes (B and As(III)) was compromised whereas that of charged solutes (NaCL and As(V)) was maintained. The mechanistic insights gained in the current study reveal the critical need to design RO membranes directly for end applications based on first principles.
机译：表面粗糙度和粗糙度结构内部的相关纳米空隙对薄膜复合聚酰胺反渗透（RO）膜的分离性能有很大影响。受最近发现的启发，这些空隙是由于界面聚合过程中CO2纳米气泡的脱气而形成的，我们首次系统地研究了碳酸盐化学的作用，尤其是CO2在间苯二胺（MPD）水溶液中的溶解度。 。当MPD溶液的pH值介于碳酸盐体系的两个酸度常数（即6.3 <= pH <= 10.3）之间时，获得“峰谷”粗糙度特征，在此条件下，HCO3-优于其他碳酸盐种类。在此范围内增加pH值既可以增加水的渗透性，又可以更好地排斥各种溶质，这要归功于同时提高了聚酰胺层的有效过滤面积和交联度。将pH值进一步提高至12.5，会由于膜水解而导致截然不同的排斥结果：神经溶质（B和As（III））的截留受到损害，而带电荷溶质（NaCL和As（V））的截留得到维持。在本研究中获得的机械洞察力表明，迫切需要直接基于第一原理为最终应用设计反渗透膜。

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  • 来源
    《Environmental Science & Technology》 |2019年第16期|9764-9770|共7页
  • 作者

    Peng Lu Elfa; Yao Zhikan; Liu Xin; Deng Baolin; Guo Hao; Tang Chuyang Y.;

  • 作者单位

    Univ Hong Kong Dept Civil Engn Pokfulam Hong Kong Peoples R China;

    Zhejiang Univ Coll Chem & Biol Engn Hangzhou 310027 Zhejiang Peoples R China;

    Southern Univ Sci & Technol Sch Environm Sci & Engn Shenzhen 518005 Peoples R China;

    Southern Univ Sci & Technol Sch Environm Sci & Engn Shenzhen 518005 Peoples R China|Univ Missouri Dept Civil & Environm Engn Columbia MO 65211 USA;

    Univ Hong Kong Dept Civil Engn Pokfulam Hong Kong Peoples R China|Univ New South Wales UNESCO Ctr Membrane Sci & Technol Sch Chem Engn Sydney NSW 2052 Australia|Univ New South Wales UNSW Water Res Ctr Sch Civil & Environm Engn Sydney NSW 2052 Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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