期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 12, 页码 16139-16150出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b02805
关键词
Anodization; TiO2 nanotube arrays; Vertically aligned titanate nanotube; Adsorption-desorption; Metal ions recovery; Recyclability
资金
- Basic Research Project of the Korea Institute of Geoscience and Mineral Resources - Ministry of Science and ICT, BK21 plus [18-3413]
- Basic Science Research Programs - Korean National Research Foundation (NRF) [2012R1A6A3A04038530]
- Korean Ministry of the Environment (MOE) [2014000160001]
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.
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