To demonstrate the recyclable nature of the GUF-14 hns nanosheets, they were collected via centrifugation post-catalysis, washed multiple times with toluene and acetone and then activated at 150 °C, prior to their re-use in catalysing the same reaction. The recycled MONs induced 75% conversion imine in both a second and third reaction, confirming its reusable nature (Table , Entries 5 and 6). The GUF-14 hns MONs recovered after catalysis show retention of crystallinity and morphology, as evidenced by PXRD and AFM. The heterogeneous nature of the reaction was confirmed by a filtration test where, after 5 h reaction, the supernatant was carefully removed using a syringe fitted with 0.1 µm PES filter, transferred to another vial and then continued to be heated under standard reaction conditions. No further conversion was observed after removal from the catalyst, proving the heterogeneous nature of the catalysis ( c Mol % of recovered GUF-14 hns restored to 0.5 mmol% with 0.5-0.9 mg fresh or recycled catalyst to account for material lost during centrifugation, washing and activation procedure. d The recovery process was repeated a second time.