A composite of SnO₂ quantum dots (QDs) decorated on TiO₂ nanospheres was prepared and then used as photocatalyst in photodegradation of 4-nitrophenol. The structure of TiO₂/SnO₂ QD composites revealed that the SnO2 quantum dots are uniformly dispersed on the surface of TiO₂ nanospheres. The effect of various parameters such as pH, concentration of dye, amount of semiconductor and light intensity was observed. The photocatalytic behavior of as-prepared samples shows better activity than pure TiO₂ nanospheres. This study presents a choice for potential applications of quantum dots in water pollution treatment.

Keywords: Quantum Dots; Endocrine Disrupting Chemicals (EDCs); Waste Water Treatment;