Designing high-performance noble-metal-free photocatalysts is the key for photocatalytic technology to expand its further application in energy and environment fields. Herein, chloroacetic acid (CA) modified SnO₂ quantum dots (QDs) with enhanced photocatalytic activity were prepared under hydrothermal condition. Through XRD, TEM, FT-IR XPS, Raman and TG analysis, it was found that CA molecules were successfully linked to the surface of SnO₂ QDs and formed stable SnO₂@CA QDs. The SnO₂@CA QDs show excellent photocatalytic activities for methyl orange, methylene blue and phenol. The photocatalytic degradation of methyl orange follows the first order reaction. From the apparent rate constant, it can be seen that the photocatalytic performances of SnO₂ QDs were significantly improved by the modification of CA, while decreased with the increase of hydrothermal reaction time. Finally, the preliminary hypothesis of SnO₂@CA QDs for degradation of organic pollutants has been proposed. The findings reported here could benefit the designing of highly efficient photocatalyst.

设计高性能的无贵金属光催化剂是光催化技术在能源和环境领域扩展其进一步应用的关键。在此，在水热条件下制备了具有增强的光催化活性的氯乙酸（CA）改性的SnO ₂量子点（QDs）。通过XRD，TEM，FT-IR XPS，拉曼和TG分析，发现CA分子成功连接到SnO ₂ QDs的表面并形成稳定的SnO ₂ @CA QDs。SnO ₂@CA QD对甲基橙，亚甲基蓝和苯酚显示出优异的光催化活性。甲基橙的光催化降解遵循一级反应。从表观速率常数可以看出，通过CA的改性，SnO ₂ QDs的光催化性能显着提高，而随着水热反应时间的增加而降低。最后，提出了SnO ₂ @CA QDs降解有机污染物的初步假设。此处报道的发现可能有益于高效光催化剂的设计。