ZnS shows high photocatalytic activity, nevertheless the operating wavelength is limited to less than 330 nm. On the other hand, CdS can be used at wavelength up to 512 nm. However, CdS requires Pt as supporting catalyst. We have synthesized Pt-free ZnxCd1-xS particles with x varying between 0 and 1 by co-precipitation method and evaluated their photocatalytic activities. The highest photocatalytic activity was recorded for Zn0.67Cd0.33S particles. Then, ZnxCd 1-xS solid solution films were prepared using the above particles by dip-coating method and their photocatalytic activities were evaluated.