Electrochemical Synthesis of Zeolite Coatings with Controlled Crystal Polymorphism and Self-Regulating Growth

IF 8.5 Q1 CHEMISTRY, MULTIDISCIPLINARY
Akash Warty, Amy Chen, Dat T. Tran, Harrison Kraus, Taylor J. Woehl and Dongxia Liu*, 
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引用次数: 0

Abstract

Zeolite coatings are studied as molecular sieves for membrane separation, membrane reactors, and chemical sensor applications. They are also studied as anticorrosive films for metals and alloys, antimicrobial and hydrophobic films for heating, ventilation, and air conditioning, and dielectrics for semiconductor applications. Zeolite coatings are synthesized by hydrothermal, ionothermal, and dry-gel conversion approaches, which require high process temperatures and lengthy times (ranging from hours to days). Here, we report the first zeolite coatings synthesized via electrochemical deposition on a cathodic electrode, with controlled crystal polymorphism achieved within subhourly duration. We demonstrate this approach by developing sodium zeolite (e.g., sodalite (SOD), NaA (LTA), and Linde Type N (LTN)) coatings on a titanium electrode and extending the synthesis method to porous stainless steel. The coating morphology and crystallinity depend on the temperature, time, and applied current. The coating thickness is independent of the applied current, showing the presence of a self-regulating mechanism to ensure a uniform coating thickness across the metal surface. The electrochemical zeolite growth mechanism was elucidated with high-resolution transmission electron microscopy, and applications of the resultant zeolite coatings for oil/water separation and ethanol/water pervaporation were exploited. Electrochemical synthesis represents a novel, simple, fast, and environmentally friendly approach to preparing zeolite coatings. It can potentially be generalized for developing zeolite materials with diverse framework structures, morphologies, and orientations for substrates with complicated geometries.

可控晶型和自调节生长的沸石涂层的电化学合成
沸石涂层作为分子筛用于膜分离、膜反应器和化学传感器的应用。它们也被研究作为金属和合金的防腐膜,用于加热、通风和空调的抗菌和疏水膜,以及半导体应用的电介质。沸石涂层是通过水热、离子热和干凝胶转化方法合成的,这些方法需要较高的工艺温度和较长的时间(从几小时到几天)。在这里,我们报道了第一个通过电化学沉积在阴极电极上合成的沸石涂层,在不到一小时的时间内实现了可控的晶体多态性。我们通过在钛电极上开发钠沸石(例如,钠石(SOD), NaA (LTA)和林德N型(LTN))涂层来证明这种方法,并将合成方法扩展到多孔不锈钢。涂层的形貌和结晶度取决于温度、时间和施加的电流。涂层厚度与施加的电流无关,显示出一种自我调节机制的存在,以确保整个金属表面的涂层厚度均匀。利用高分辨率透射电镜分析了电化学沸石的生长机理,并对制备的沸石涂层在油水分离和乙醇/水渗透蒸发中的应用进行了探索。电化学合成是一种新颖、简单、快速、环保的制备沸石涂层的方法。它可以推广到开发具有不同框架结构、形态和取向的分子筛材料,用于具有复杂几何形状的底物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.10
自引率
0.00%
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0
审稿时长
10 weeks
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