Synthesis of UPy-CDs
UPy-CDs were prepared with EDTA-CDs and UPy-NCO in nitro
gen atmosphere. EDTA-CDs (0.10 g) and UPy-NCO (0.04 g) were added to Schlenk flask. After 10 min of scavenging under N2atmosphere, DMF (10 mL) and catalyst (DBTDL) were added to the reaction bottle, and then the reaction solution was heated to 95oC. After stirring at 95 oC for 24 h, dichloromethane was subsequently added to the reaction solution to precipitate it. Then filter (0.22 um) to take the filter slag, the obtained slag into 60 oC overnight, to get powder.