2.2. Preparation of materials
According to reported work27, MIL-101(Cr) was prepared by H2BDC and Cr(NO3)3ยท9H2O.
IL/MIL-x : MIL-101(Cr) was degassed by vacuum activation at 353 K before sample preparation. Then, a methanol solution of [BOHmim]Cl was mixed with activated MIL-101(Cr) powder, and the mixture was magnetically agitated at 298 K for 1 h. Subsequently, the sample was dried at 378 K for 12 h in an oven. The composites are identified as IL/MIL-x, where x is the weight percentage of IL in the composite (for example, x = 0.2, 0.4, 0.7).
Detailed procedures for synthesizing [BOHmim]Cl, MIL-101(Cr) and IL/MIL-x are shown in Section S1 of Supporting Information (SI).