As a new member of carbon dots (CDs), Polymer dots (PDs) prepared by hydrothermal treatment of polymers, usually consist of the carbon core and the connected partially degraded polymer chains. This type of CDs might possess aqueous solubility, non-toxicity, excellent stability against photo-bleaching and high visible light activity. In this research, PDs were prepared by a moderate hydrothermal treatment of polyvinyl alcohol, and PDs grafted TiO₂ (PDs-TiO₂) nanohybrids with Ti

OC bonds were prepared by a facile in-situ hydrothermal treatment of PDs and Ti (SO₄)₂. Under visible light irradiation, the PDs-TiO₂ demonstrated excellent photocatalytic activity for methyl orange degradation, and the photocatalytic rate constant of PDs-TiO₂ is 3.6 and 9.5 times higher than that of pure TiO₂ and commercial P25, respectively. In addition, the PDs-TiO₂ exhibit good recycle stability under UV–Vis light irradiation. The interfacial TiOC bonds and the π-conjugated structures in PDs-TiO₂ can act as the pathways to quickly transfer the excited electrons between PDs and TiO₂, therefore contribute to the excellent photocatalytic activity.

中文翻译：

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聚合物点接枝TiO ₂纳米杂化物作为高性能可见光光催化剂

作为碳点（CD）的新成员，通过对聚合物进行水热处理制备的聚合物点（PD）通常由碳核和相连的部分降解的聚合物链组成。这种CD可能具有水溶性，无毒，对光致漂白具有出色的稳定性以及高可见光活性。在这项研究中，通过对聚乙烯醇进行适度的水热处理来制备PD，然后将PDs接枝有Ti的TiO ₂（PDs-TiO ₂）纳米杂化物。

ØC键是通过对PDs和Ti（SO ₄）₂进行简便的原位水热处理而制备的。在可见光照射下，PDs-TiO ₂对甲基橙降解表现出优异的光催化活性，PDs-TiO ₂的光催化速率常数分别为纯TiO ₂和市售P25的3.6和9.5倍。另外，PDs-TiO ₂在紫外线-可见光照射下表现出良好的循环稳定性。界面钛ØPDs-TiO _2中的C键和π共轭结构可以作为在PDs和TiO ₂之间快速转移激发电子的途径，因此具有出色的光催化活性。