Vertically Aligned Titanate Nanotubes Hydrothermally Synthesized from Anodized TiO2 Nanotube Arrays: An Efficient Adsorbent for the Repeatable Recovery of Sr Ions,ACS Sustainable Chemistry & Engineering

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Vertically Aligned Titanate Nanotubes Hydrothermally Synthesized from Anodized TiO2 Nanotube Arrays: An Efficient Adsorbent for the Repeatable Recovery of Sr Ions
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-19 00:00:00 , DOI: 10.1021/acssuschemeng.8b02805
Love Kumar Dhandole ₁ , Hee-Suk Chung ₂ , Jungho Ryu ₃ , Jum Suk Jang ₁

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Vertically aligned titanate nanotubes (VA-TNTs) are prepared for the repeated and effective recovery of Sr ions. Two-electrode electrochemical anodization with a 50 V potential was used to prepare the TiO₂ nanotube arrays on a Ti metal foil. The growth and inner diameters of the TiO₂ nanotubes were measured as a function of the anodization potential and reaction time. VA-TNTs structures are synthesized via one-step alkaline hydrothermal (HT) reaction of the as-prepared anodized TiO₂ nanotube arrays (anodic TiNA). The titanate nanotube synthesis is successfully optimized, revealing that a low calcination temperature and a low HT reaction time allowed for the synthesis of a vertically aligned homogeneously dispersed “Grass”-type morphology among the titanate nanotubes. The equilibrium isotherm and kinetic data are used for model fitting. High-resolution transmission electron microscopy images and X-ray energy dispersive spectroscopy elemental characterizations provided a detailed chemical composition and surface analysis of the VA-TNTs. The recyclability of the VA-TNTs for repeated metal ion adsorption–desorption is demonstrated successfully. The crystallinity of the VA-TNTs after each repeated desorption cycle was dramatically improved by Na treatment. This structural reformation (Na treatment) step increased the number of possible high-yield metal ion recovery cycles. Also, the VA-TNTs have great potential for removing toxic heavy metal ions in an easy, economic, and environmentally friendly way.

中文翻译：

从阳极氧化的TiO ₂纳米管阵列水热合成的垂直排列的钛酸酯纳米管：有效的吸附剂，可重复回收Sr离子

制备垂直排列的钛酸酯纳米管（VA-TNT），以重复有效地回收Sr离子。使用具有50 V电位的两电极电化学阳极氧化来在Ti金属箔上制备TiO ₂纳米管阵列。测量了TiO ₂纳米管的生长和内径与阳极氧化电势和反应时间的关系。VA-TNTs结构是通过制备的阳极氧化TiO ₂的一步碱性水热（HT）反应合成的纳米管阵列（阳极TiNA）。成功地优化了钛酸酯纳米管的合成，揭示出低的煅烧温度和低的HT反应时间可合成钛酸酯纳米管之间垂直排列的均匀分散的“草”型形态。平衡等温线和动力学数据用于模型拟合。高分辨率透射电子显微镜图像和X射线能量色散光谱学元素表征提供了VA-TNT的详细化学组成和表面分析。VA-TNTs可重复使用的金属离子吸附-解吸的可回收性已得到成功证明。通过钠处理，在每个重复的解吸循环之后，VA-TNT的结晶度显着提高。此结构重整（Na处理）步骤增加了可能的高产率金属离子回收循环的数量。而且，VA-TNTs具有以简便，经济和环保的方式去除有毒重金属离子的巨大潜力。

更新日期：2018-10-19

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