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首页> 外文期刊>Separation and Purification Technology >Surface modification of glass fiber membranes by fluorographite coating for desalination of concentrated saline water with humic acid in direct-contact membrane distillation
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Surface modification of glass fiber membranes by fluorographite coating for desalination of concentrated saline water with humic acid in direct-contact membrane distillation

机译：用荧光涂层用荧光涂层用浓盐水蒸馏出直接膜蒸馏中浓盐水涂层的表面改性

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摘要

Amphiphobic materials are gaining popularity in many applications because they have self-cleaning properties. Self-cleaning substrates are important for applications in antifouling surfaces in seawater and antifouling membranes for desalination; membrane-based desalination and particularly distillation uses hydrophobic membranes. However, the lack of commercial amphiphobic membranes has prevented the exploration of customized membranes. In this research, we applied fluorographite (FGi) particles to glass fiber (GF) membranes with polydimethylsiloxane (PDMS) to render superhydrophilic filters into Amphiphobic membranes. The coating was applied via a dip/immersion method using hexane, a low-surface tension solvent, and PDMS paired with reaction assistants for the PDMS systems. The surface modifications introduced functionality to the membrane surfaces by the incorporation of FGi and PDMS, enhancing the evaluated amphiphobicity. Contact angles (CA) were observed using water and organic solutions to determine oleophobicity. We also evaluated the effects of the amount of FGi particles, PDMS, reaction assistants, and the drying and curing reaction times on the CA and liquid entry pressures (LEPs) of the coated membranes. The post-coating CA with water and the low-surfacetension liquid like dimethyl sulfoxide showed improved amphiphobicity. Furthermore, the surface characteristics were evaluated by Fourier-transform infrared spectroscopy and scanning electron microscopy to identify the chemical groups developed during coating and the morphological changes before and after membrane coating. Finally, the modified membrane was applied in direct-contact membrane distillation (DCMD) with a highly concentrated feed solution containing 1 M NaCl and 10 mg/L humic acid (HA) as an organic foulant. The DCMD results demonstrated the success of the coating in membrane distillation applications.
机译：两栖动物材料在许多应用中获得普及，因为它们具有自清洁性质。自清洁基材对于防污表面在海水中的应用和用于海水淡化的防污膜中的应用很重要;基于膜的脱盐，特别是蒸馏使用疏水性膜。然而，缺乏商业两亲膜已经阻止了定制膜的探索。在本研究中，我们用聚二甲基硅氧烷（PDMS）将荧光石（FGI）颗粒涂覆到玻璃纤维（GF）膜中，以使超硫酸过滤器将过硫基过滤成两亲膜。使用己烷，低表面张力溶剂和与PDMS系统的反应助剂配对的PDMS涂覆涂层。通过掺入FGI和PDMS，表面改性将功能引入膜表面，增强了评估的两亲性。使用水和有机溶液观察到接触角（CA）以确定疏油性。我们还评估了FGI颗粒，PDMS，反应助剂和干燥和固化反应时间对涂覆膜的CA和液体入口压力（LEPS）的影响。涂布后Ca与水和低水压灭菌液体如二甲基亚砜，显示出改善的两亲性。此外，通过傅里叶变换红外光谱和扫描电子显微镜评估表面特性，以鉴定涂层期间开发的化学基团和膜涂层前后的形态变化。最后，用含有1M NaCl和10mg / L培养酸（HA）的高浓缩膜蒸馏（DCMD）以直接接触膜蒸馏（DCMD）施用，作为有机污垢。 DCMD结果表明涂层在膜蒸馏应用中的成功。

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