School of Chemistry and Environment, Key Lab of Electrochemical Technology on Energy Storage and Power Generation in Guangdong Universities, South China Normal University, Guangzhou 510006, China.
J Hazard Mater. 2011 Aug 30;192(2):514-20. doi: 10.1016/j.jhazmat.2011.05.053. Epub 2011 May 23.
Titanate nanotube powders (TNTPs) with the twofold removal ability, i.e. adsorptive separation and photocatalytic degradation, are synthesized under hydrothermal conditions using metal Ti particles as a precursor in the concentrated alkaline solution, and their morphology, structure, adsorptive and photocatalytic properties are investigated. Under hydrothermal conditions, the titanate nanotubes (TNTs) with pore diameter of 3-4nm are produced on the surface of metal Ti particles, and stacked together to form three-dimensional (3D) network with porous structure. The TNTPs synthesized in the autoclave at 130°C for 24h exhibits a maximum adsorption capability of about 197mg g(-1) in the neutral methylene blue (MB) solution (40mg L(-1)) within 90min, the adsorption process can be described by pseudo second-order kinetics model. Especially, in comparison with the adsorptive and the photocatalytic processes are performed in turn, about 50min can be saved through synchronously utilizing the double removal ability of TNTPs when the removal ratio of MB approaches 95% in MB solution (40mg L(-1)) at a solid-liquid (S/L) ratio of 1:8 under ultraviolet (UV) light irradiation. These 3D TNTPs with the twofold removal properties and easier separation ability for recycling use show promising prospect for the treatment of dye pollutants from wastewaters in future industrial application.
钛酸盐纳米管粉末（TNTPs）具有双重去除能力，即吸附分离和光催化降解，在水热条件下，以金属 Ti 颗粒为前驱体，在浓堿溶液中合成，对其形貌、结构、吸附和光催化性能进行了研究。在水热条件下，在 130°C 的高压釜中反应 24 小时，在中性亚甲基蓝（MB）溶液（40mg/L）中，金属 Ti 颗粒表面生成的钛酸盐纳米管（TNTs）具有 3-4nm 的孔径，形成具有多孔结构的三维（3D）网络。在中性亚甲基蓝（MB）溶液（40mg/L）中，吸附过程在 90min 内达到 197mg/g 的最大吸附能力，吸附过程可用伪二级动力学模型描述。与吸附和光催化过程依次进行相比，在 S/L 比为 1:8、UV 光照射下，在 40mg/L 的 MB 溶液中，去除率接近 95%时，通过同步利用 TNTPs 的双重去除能力，可节省约 50min。这种具有双重去除性能和更容易分离能力的 3D TNTPs 有望在未来的工业应用中用于处理废水中的染料污染物。
