Effects of sodium content on the microstructures and basic dye cation exchange of titanate nanotubes
Effects of sodium content on the microstructures and basic dye cation exchange of titanate nanotubes
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DOI：
10.1016/j.colsurfa.2007.10.008
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发表时间：
2008-03
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通讯作者：
Chung-Kung Lee;Cheng-Cai Wang;L. Juang;Meng-Du Lyu;Shui-Hung Hung-Shui-Hung-Hung-19382659;Shin-shou Liu
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文献类型：
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作者：
Chung-Kung Lee;Cheng-Cai Wang;L. Juang;Meng-Du Lyu;Shui-Hung Hung-Shui-Hung-Hung-19382659;Shin-shou Liu
研究了钛酸盐纳米管（TNT）通过阳离子交换机制去除水溶液中碱性染料（碱性紫3，BV3）的潜力。将tio2粉末在10M NaOH溶液中150℃水热处理24h，制备TNT，然后用不同浓度的HCl水溶液洗涤。采用透射电子显微镜（TEM）、x射线衍射仪（XRD）和氮吸附-脱附等温线对残余钠含量对TNT微观结构的影响进行了表征。研究发现，如果钠没有进行完全的质子交换，钠的去除会增加TNT的比表面积和孔容。当TNT的钠含量约为0wt时。%（质子交换几乎完全后），钛酸盐的纳米管结构可能被破坏，并伴随着比表面积和孔体积的急剧减小。探讨了酸洗过程引起的微观结构变化对TNT脱BV3性能的影响。此外，通过对BV3吸附平衡的模型分析和动力学数据，探讨了碱性染料对TNT的去除机理。
The potential of titanate nanotubes (TNT) to remove basic dye (Basic Violet 3, BV3) from aqueous solution through a cation exchange mechanism was investigated. TNT was prepared via a hydrothermal treatment of TiO2powders in a 10M NaOH solution at 150°C for 24h, and subsequently washed with HCl aqueous solution of different concentrations. Effects of the remnant sodium contents on the microstructures of TNT were characterized with transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen adsorption–desorption isotherms. It was found that if the sodium did not undergo complete proton exchange, the removal of sodium increased the specific surface area and pore volume of the TNT. When the sodium content of the TNT was approximately 0wt.% (after a nearly-complete proton exchange), the nanotubular structure of the titanates might be destroyed, accompanied by a sharp decrease in the specific surface area and pore volume. Effects of the alteration of microstructures, induced by the acid washing process, on the BV3 removal performance of TNT were discussed. Moreover, the removal mechanisms of basic dye from aqueous solution onto TNT were examined with the aid of model analyses of the adsorption equilibrium and kinetic data of BV3.