Synthesis of Titanium Oxide Nanotube via Hydrothermal Method and Recovery of Palladium by means of it
Nanotubes composed of various materials such as carbon, boron nitride, and wolfram disulfide have been studied recently. In this study, the discovery of a hydrothermal route for the synthesis of a nanotube made of titanium oxide by microwave annealing is presented. TiO2 nanotubes obtained in the present work are anticipated to have great potential for use in the preparation of catalysts, adsorbants, and deodorants with high activities, because their specific surface area is greatly increased. Anastase phase TiO2 crystals with a diameter of ~10 nm and a length of ~85 nm were obtained when sol−gel-derived fine TiO2-based powders were treated chemically (e.g., for 30 h at 120 °C) with a 8 M NaOH aqueous solution. The TiO2 nanotubes have a large specific surface area of 420 m2·g-1. The nanotubes were investigated as adsorbents for the removal of Pd (II) from aqueous solutions. It was shown that the initial uptake of each metal ion was very fast in the first 35 min, and adsorption equilibrium was reached after 120 min. The maximum adsorption capacity of Pd (II) was determined to be 50.54 mg g−1, respectively. Thus, TiO2 nanotubes were considered to be effective and promising materials for the recovery of Pd (II).
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