environment, which is defined as one of most toxic pollutants by the United States Environmental Protection Agency due to its high solubility. [1][2][3] With 100 times higher toxicity than Cr 3+ , Cr 6+ poses a great threat to the ecosystem, particularly from its biological recycling. [4] Thus the concentration of Cr 6+ in industrial wastewater needs to be strictly controlled before it can be safely discharged. Many methodsThe ORCID identification number(s) for the author(s) of this article can be found under

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The percentage of the exposed facets affect the interface connection between the semiconductor and the cocatalysts, leading to different separation rates of carriers.

Compositing nanoparticles photo-catalyst with enormous surface areas metal–organic framework (MOF) will greatly improve photocatalytic performances. Herein, WO3 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 WO3@MIL-101@WO3 and coating structure WO3&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 WO3, all WO3 loaded MOF nanocomposites exhibited remarkable enhancing for the efficiency of photocatalytic degradation methylene blue under visible light. Their activity of the same loading percentage WO3 in embedded structure and coating structure have increased for 9 and 3 times respectively compared with pure WO3. The WO3@MIL-101@WO3 has 3 times higher efficiency than WO3&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.