Two-dimensional titanium carbide (Ti₃C₂T_x) MXene nanosheets have been widely concerned due to its abundant surface functional groups, high conductivity, excellent photoelectrochemical properties and thermal conductivity. Nevertheless, it is still a challenge for the mass production of high-quality Ti₃C₂T_x MXene nanosheets. Herein, the bulk Ti₃C₂T_x MXene powders were stripped into monolayer or few layer nanosheets in propylene carbonate through liquid-phase exfoliation strategy assisted via alkanolamine as intercalators. It is shown that the stripping yield is up to 59.3 %, which is the recorded value for the delamination of Ti₃C₂T_x MXene nanosheets from bulk Ti₃C₂T_x MXene powder, and 62.2 % of nanosheets are monolayer. The ability of hydrogen bond donor and molecular size of alkanolamine have important effects on the yield. Moreover, Ti₃C₂T_x MXene nanosheets have been employed as catalysts in the photocatalytic CO₂ reduction. The yield of CO is 149.7 μmol g^-1h⁻¹, which is about five times that of bulk Ti₃C₂T_x MXene powder. This work paves the way for the mass production of MXene nanosheets with high activity photocatalysis.

二维碳化钛（Ti ₃ C ₂ T _x）MXene纳米片因其丰富的表面官能团、高导电性、优异的光电化学性能和导热性而受到广泛关注。尽管如此，大规模生产高质量的Ti ₃ C ₂ T _x MXene 纳米片仍然是一个挑战。在此，块体 Ti ₃ C ₂ T _x通过链烷醇胺作为嵌入剂辅助的液相剥离策略，将 MXene 粉末在碳酸亚丙酯中剥离成单层或几层纳米片。结果表明，剥离率高达 59.3 %，这是 Ti ₃ C ₂ T _x MXene 纳米片从块状 Ti ₃ C ₂ T _x MXene 粉末分层的记录值，62.2 % 的纳米片是单层的。链烷醇胺的氢键供体能力和分子大小对收率有重要影响。此外，Ti ₃ C ₂ T _x MXene 纳米片已被用作光催化 CO _{2中的催化剂}减少。CO的产率为149.7 μmol g ^-1 h ^-1，约为块状Ti ₃ C ₂ T _x MXene 粉末的5倍。这项工作为大规模生产具有高活性光催化作用的 MXene 纳米片铺平了道路。