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首页> 外文期刊>Environmental Science & Technology >Surface-Induced Silica Scaling during Brackish Water Desalination: The Role of Surface Charge and Specific Chemical Groups
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Surface-Induced Silica Scaling during Brackish Water Desalination: The Role of Surface Charge and Specific Chemical Groups

机译：在咸水海水淡化期间表面诱导的二氧化硅缩放：表面电荷和特定化学基团的作用

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摘要

Silica scaling of membranes used in reverse osmosis desalination processes is a severe problem, especially during the desalination of brackish groundwater due to high silica concentrations. This problem limits the water supply in inland arid and semiarid regions. Here, we investigated the influence of surface-exposed organic functional groups on silica precipitation and scaling. A test solution simulating the mineral content of brackish groundwater desalination brine at 75% recovery was used. The mass and chemical composition of the precipitated silica was monitored using a quartz crystal microbalance, X-ray photoelectron spectroscopy, and infrared spectroscopy, showing that surfaces with positively charged groups induced rapid silica precipitation, and the rate of silica precipitation followed the order -NH2 similar to -N+ (CH3)(3) -NH2/-COOH -H2PO3 similar to -OH -COOH -CH3. Force vs distance AFM measurements showed that the adhesion energy between a silica colloid glued to AFM cantilever and the studied surfaces increased as the surface charge changed from negative to positive. Thus, for the first time direct measurements of molecular forces and specific chemical groups that govern silica scaling during brackish water desalination is reported here. The influence of the different functional groups and the effect of the surface charge on silica precipitation that were found here can be used to design membranes that resist silica scaling in membrane-based desalination processes.
机译：反渗透脱盐过程中使用的膜的二氧化硅缩放是严重的问题，特别是由于高二氧化硅浓度导致的咸水地下水的脱盐期间。这个问题限制了内陆干旱和半干旱地区的供水。在这里，我们研究了表面暴露的有机官能团对二氧化硅沉淀和缩放的影响。使用在75％回收率下模拟颗粒的矿物质含量的矿物质含量的测试解决方案。使用石英晶体微稳定，X射线光电子能谱和红外光谱监测沉淀二氧化硅的质量和化学成分，显示出具有带正电荷基团的表面诱导硅胶沉淀的曲线，并且硅沉淀的速率随之而来的硅酸盐沉淀率-NH2类似于-N +（CH3）（3）> -NH2 / -COOH> -H2PO3，类似于-OH> -COOH> -CH3。力与距离AFM测量结果表明，随着表面电荷从负变为正的表面电荷变化，所研究的表面增加到AFM悬臂的粘合能量增加。因此，在此目明，首次进行分子力的直接测量分子力和治疗二氧化硅缩放的特定化学基团。不同官能团的影响以及表面电荷对本发明的效果的影响可用于设计抗抵抗基于膜的脱盐过程中的二氧化硅缩放的膜。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|5202-5211|共10页
  • 作者

    Rathinam Karthik; Abraham Shiju; Oren Yoram; Schwahn Dietmar; Petry Winfried; Kaufman Yair; Kasher Roni;

  • 作者单位

    Ben Gurion Univ Negev Zuckerberg Inst Water Res Blaustein Inst Desert Res Dept Desalinat & Water Treatment Sde Boqer Campus IL-8499000 Midreshet Ben Gurion Israel;

    Ben Gurion Univ Negev Zuckerberg Inst Water Res Blaustein Inst Desert Res Dept Desalinat & Water Treatment Sde Boqer Campus IL-8499000 Midreshet Ben Gurion Israel;

    Ben Gurion Univ Negev Zuckerberg Inst Water Res Blaustein Inst Desert Res Dept Desalinat & Water Treatment Sde Boqer Campus IL-8499000 Midreshet Ben Gurion Israel;

    Tech Univ Munich Heinz Maier Leibnitz FRM 2 Forsch Neutronenquelle James Franck Str 1 D-85748 Garching Germany;

    Tech Univ Munich Heinz Maier Leibnitz FRM 2 Forsch Neutronenquelle James Franck Str 1 D-85748 Garching Germany;

    Ben Gurion Univ Negev Zuckerberg Inst Water Res Blaustein Inst Desert Res Dept Desalinat & Water Treatment Sde Boqer Campus IL-8499000 Midreshet Ben Gurion Israel;

    Ben Gurion Univ Negev Zuckerberg Inst Water Res Blaustein Inst Desert Res Dept Desalinat & Water Treatment Sde Boqer Campus IL-8499000 Midreshet Ben Gurion Israel;

  • 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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