The results showed that Cu existed in several kinds of valence and the photocatalytic activity of Cu/Sr_3Ti_2O_7 was superior to that of pure Sr_3Ti_2O_7. Cu+ and adsorbed oxygen can accelerate the interfacial electron transfer.

• 实验结果表明；Cu在催化剂中以多价态存在；Cu+和吸附氧有利于光生电子的转移.；Cu/Sr_3Ti_2O_7催化剂较之纯Sr_3Ti_2O_7催化剂活性大大提高；Cu最佳负载量为1