In this review, the prepared methods, morphologies, dopant and applications of mesoporous TiO₂ nanomaterials are summarized. The synthetic methods of the mesoporous TiO₂ nanomaterials include hydrothermal method, solvothermal method, template method, sol-gel method, self-assembly method and so on. Mesoporous TiO₂ functional nanomaterials with various morphologies including mesoporous microspheres, nanotubes, nanowires, nanosheet and three-dimensional mesoporous microspheres composed of the assembly of the two-dimensional structure, etc. could be achieved via different preparation methods. At the same time, the mesoporous TiO₂ with various morphologies are widely used in many fields. The mesoporous TiO₂ microspheres with hollow structure can be used as microreactor, and the TiO₂ nanotubes with ordered structure can be applied to solar cell for the shorter transmission distance than the disordered structure. The mesoporous TiO₂ will be capable of dealing with the photodegradation of the organic dye due to the mesoporous TiO₂ with excellent crystallization as well as high specific surface area. The applications of the mesoporous TiO₂ in photocatalysis, solar cell, lithium ion battery, and sewage treatment are given in this review. Meanwhile, research advances in synthetic methods and applications of the mesoporous TiO₂ nanomaterials are summarized owing to the performance of the mesoporous TiO₂ depending on their synthetic conditions. Furthermore, the applications of mesoporous TiO₂ nanomaterials in the future are prospected.

Contents
1 Introduction
2 Preparation of the mesoporoous TiO₂
2.1 Hydrothermal method
2.2 Template method
2.3 Solvothermal method
2.4 Sol-gel method
2.5 Chemical deposition method
2.6 Sacrificial template method
3 Dopant of the mesoporous TiO₂
3.1 Non-metal doping
3.2 Metal doping
3.3 Codope
4 Application of the mesoporous TiO₂
4.1 Photocatalyst
4.2 Solar cell
4.3 Lithium ion battery
4.4 Ionic adsorption
5 Conclusion and outlook