In this work, a new artificial photocatalytic system has been designed based on the two-dimensional (2D) heterojunction of bismuth molybdate (Bi₂MoO₆)/Ti₃C₂ MXenes. The strong interface contact and short charge transport distance between Bi₂MoO₆ and Ti₃C₂ ensure extraordinary surface and interface charge transfer abilities. The optimized photocatalyst Bi₂MoO₆/Ti₃C₂ exhibited the highest photocatalytic activity, and its removal rates for tetracycline hydrochloride (TC) and heavy metal ion Cr(VI) were about 8.8 and 11.2 times that of pristine Bi₂MoO₆, respectively. DFT simulation calculations revealed that the stronger interaction promotes the polarization charge distribution of Bi₂MoO₆/Ti₃C₂, thereby further enhancing the separation and transfer of photoinduced electrons and holes. Meanwhile, Bi₂MoO₆/Ti₃C₂ could provide new adsorption sites, which are conducive to the interaction between pollutant molecules and the catalyst. This indicates that efficient charge separation and excellent adsorption in heterojunction photocatalysts play a key role in improving photocatalytic performance.

中文翻译：

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用于快速四环素降解和Cr（VI）还原的Bi2MoO6 / Ti3C2 MXene异质结光催化剂的制备

在这项工作中，基于钼酸铋（Bi ₂ MoO ₆）/ Ti ₃ C ₂ MXenes的二维（2D）异质结，设计了一种新的人工光催化系统。Bi ₂ MoO ₆和Ti ₃ C ₂之间的牢固的界面接触和短的电荷传输距离确保了出色的表面和界面电荷转移能力。优化的光催化剂Bi ₂ MoO ₆ / Ti ₃ C ₂表现出最高的光催化活性，并且对四环素盐酸盐（TC）和重金属离子Cr（VI）分别是原始Bi ₂ MoO _6的8.8倍和11.2倍。DFT模拟计算表明，较强的相互作用促进了Bi ₂ MoO ₆ / Ti ₃ C ₂的极化电荷分布，从而进一步增强了光致电子和空穴的分离和转移。同时，Bi ₂ MoO ₆ / Ti ₃ C ₂可以提供新的吸附位，有利于污染物分子与催化剂之间的相互作用。这表明异质结光催化剂中有效的电荷分离和出色的吸附作用在改善光催化性能方面起着关键作用。