A series of Bi/BiOCl/TiO₂-CQDs(α) (BBTC-α) quaternary photocatalysts with lamellar structure were synthesized via a solvothermal method followed by a hydrothermal process. The BBTC-0.6 photocatalyst exhibited highest visible-light photoactivity in decomposing methyl orange and p-nitrophenol, and it was about 4.8 and 10.3 times of BiOCl/TiO₂ nanosheets. In this system, Bi and CQDs were served as electron donors, and BiOCl and TiO₂ were served as electron trappers to extend the lifetime of photogenerated carriers. The enhanced visible-light photoactivity could be attributed to the strong light absorption and upconversion photoluminescence of the CQDs, and the surface plasmon resonance effect of the surface Bi also played an important role in this system.

通过溶剂热法和水热法合成了一系列具有层状结构的Bi / BiOCl / TiO ₂ -CQDs（α）（BBTC-α）季光催化剂。BBTC-0.6光催化剂在分解甲基橙和对硝基苯酚中表现出最高的可见光光活性，约为BiOCl / TiO ₂纳米片的4.8和10.3倍。在该系统中，Bi和CQD充当电子给体，BiOCl和TiO ₂充当电子陷阱，以延长光生载流子的寿命。可见光光活性的增强可归因于CQD的强光吸收和上转换光致发光，并且表面Bi的表面等离子体激元共振效应在该系统中也起着重要作用。