Synthesis, Characterization And Application One-dimensional Titanate Nanomaterial For Adsorption Of Th(Ⅳ)

Thorium has been further developed and utilized with the extensive application ofnuclear energy and the vigorous development of nuclear power enterprise. But theresulting radioactive contamination and other issues can not be ignored, especially thedischarge of waste water containing thorium from the thorium, uranium and rare earthsmelting process which will cause serious harm to the ecological environment and humanhealth. Therefore, which recycles or solidifies thorium from the thorium-containing waterwill paly a important role for the sustainable development in the future of nuclear energy.Titanate nano-material is a kind of new functional materials, which has a huge surfacearea and rich in hydroxyl, so in the radionuclide adsorption and other fields has animportant research value. In this paper, three different morphologies titanatenano-materials had been synthesized, furthermore, the application of adsorption for theTh（Ⅳ） of those materials were investigated. The mainly includes the following aspects:1. Titanate nanotubes have been synthesized by a hydrothermal method by using rutileTiO₂powder as titanium source at150℃for48h. The adsorption of Th（Ⅳ） on titanatenanotubes was studied as a function of contact time, pH values, ionic strength, initialTh（Ⅳ） concentration and temperature under ambient conditions by using batch technique.The results indicate that adsorption of Th（Ⅳ） on titanate nanotubes achieves the adsorptionequilibrium in8h; It strongly dependent on pH values, but weakly dependent on ionicstrength. The adsorption kinetics and the adsorption isotherms models is better describedby the pseudo-second-order model and the Langmuir models, respectively. Furthermore,the adsorption of titanate nanotubes for Th（Ⅳ） is an endothermic and a spontaneousprocess, and increases with increasing temperature.. The adsorption capacities of232.56mg·g^-1.2. Titanate nanowhiskers have been synthesized by a hydrothermal method by usingrutile TiO₂powder as titanium source at180℃for48h. The adsorption of Th（Ⅳ） ontitanate nanowhiskers were investigated as a function of contact time, pH values, ionicstrength, initial Th（Ⅳ） concentration and temperature under ambient conditions by usingbatch technique. The results indicate that adsorption of Th（Ⅳ） on titanate nanowhiskersachieves the adsorption equilibrium in8h; It strongly dependent on pH values, but weaklydependent on ionic strength. The adsorption kinetics and the adsorption isotherms model isbetter described by the pseudo-second-order model and the Langmuir models and the Freundlich models, respectively. As well as the titanate nanotubes, the adsorption oftitanate nanowhiskers for Th（Ⅳ） is an endothermic and a spontaneous process, andincreases with increasing temperature. The adsorption capacities of252.52mg·g^-1.3. Titanate nanoribbons have been synthesized by a hydrothermal method usingtetrabutyl titanate as titanium source at200℃for48h. The adsorption of Th（Ⅳ） ontitanate nanoribbons was studied as a function of contact time, pH values, ionic strength,initial Th（Ⅳ） concentration and temperature under ambient conditions by using batchtechnique. The results indicate that adsorption of Th（Ⅳ） on titanate nanoribbons achievesthe adsorption equilibrium in7h; It strongly dependent on pH values, but weaklydependent on ionic strength; The adsorption kinetics and the adsorption isotherms model isbetter described by the pseudo-second-order model and the Langmuir models too,respectively. Meanwhile, The adsorption of titanate nanoribbons for Th（Ⅳ） is anendothermic and a spontaneous process, and increases with increasing temperature. Theadsorption capacities of113.64mg·g^-1.