WO in suit embed into MIL-101 for enhancement charge carrier separation of photocatalyst.

Compositing nanoparticles photo-catalyst with enormous surface areas metal-organic framework (MOF) will greatly improve photocatalytic performances. Herein, WO nanoparticles are partly embedded into pores of MIL-101 or only supported on the outside of representative MIL-101, which were defined as embedded structure WO@MIL-101@WO and coating structure WO&MIL-101 respectively. Different pH, concentration and loading percentage were researched. XRD, TEM and BET were carried to analyze the composites. Compared with the pristine WO, all WO loaded MOF nanocomposites exhibited remarkable enhancing for the efficiency of photocatalytic degradation methylene blue under visible light. Their activity of the same loading percentage WO in embedded structure and coating structure have increased for 9 and 3 times respectively compared with pure WO. The WO@MIL-101@WO has 3 times higher efficiency than WO&MIL-101, because the shorter electron-transport distance can make a contribution to electron-hole separation. The further mechanism involved has been investigated by radical quantify experiment, XPS and photoluminescence spectroscopy.