A fractional factorial design method was used for of synthesis of CdS quantum dots.

CdS QDs were prepared with an in-situ synthesis method using aqueous solutions.

CdS QD show good photocatalytic activity for degradation of dye under visible light.

The synthesized CdS QDS are stable and can be used for long-term applications.

CdS QDs can be used for degradation of organic pollutants in wastewater treatments.