In this dissertation, waste pearl shells were activated at different temperatures, and used as carriers to support nano Cu_2O through hydrolysis process. These as-prepared different nano-Cu_2O/pearl shell composites had been selected by photocatalytic experiments and X-ray diffraction (XRD) characterization. The results show that nano-Cu_2O/pearl shell composites can be achieved when pearl shell carriers calcined at the temperature higher than 800 oC. The composites prepared with pearl shells calcined at 10...