Uses of layered alkali titanates (A₂Ti_nO_2n+1; Na₂Ti₃O₇, K₂Ti₄O₉, and Cs₂Ti₅O₁₁) for energy and environmental issues are summarized. Layered alkali titanates of various structural types and compositions are regarded as a class of nanostructured materials based on titanium oxide frameworks. If compared with commonly known titanium dioxides (anatase and rutile), materials design based on layered alkali titanates is quite versatile due to the unique structure (nanosheet) and morphological characters (anisotropic particle shape). Recent development of various synthetic methods (solid-state reaction, flux method, and hydrothermal reaction) for controlling the particle shape and size of layered alkali titanates are discussed. The ion exchange ability of layered alkali titanate is used for the collection of metal ions from water as well as a way of their functionalization. These possible materials design made layered alkali titanates promising for energy (including catalysis, photocatalysts, and battery) and environmental (metal ion concentration from aqueous environments) applications.

层状碱金属钛酸盐的用途（A ₂ Ti _n O _{2 n +1}；Na ₂ Ti ₃ O ₇、K ₂ Ti ₄ O ₉和Cs ₂ Ti ₅ O ₁₁) 对能源和环境问题进行了总结。各种结构类型和成分的层状碱金属钛酸盐被认为是一类基于氧化钛骨架的纳米结构材料。如果与众所周知的二氧化​​钛（锐钛矿和金红石）相比，基于层状碱金属钛酸盐的材料设计由于其独特的结构（纳米片）和形态特征（各向异性颗粒形状）而具有相当的通用性。讨论了用于控制层状碱金属钛酸盐的颗粒形状和尺寸的各种合成方法（固态反应、熔剂法和水热反应）的最新进展。层状碱金属钛酸盐的离子交换能力用于从水中收集金属离子及其功能化的一种方式。