Metal monatomic catalyst as well as preparation method and application thereof

[0042]Example 1

[0043]In a high-purity Ar atmosphere, Ti3AlC2Ceramic/CuCl2The mixed powder with a molar ratio of 1:10 was reacted at 900℃ for 48h, washed with 3M HCl for 24h, centrifuged, and freeze-dried to obtain a catalyst Cu@Ti loaded with monoatomic Cu.3C2(According to the EDS spectrum, the loading of monoatomic Cu is determined to be 1.8%). Using a five-digit analytical balance, weigh 20 mg of the monoatomic Cu-loaded catalyst and add it to a mixed solution (1000 mL) of 3 mM potassium hydrogen persulfate (PMS) and 10 μM sulfamethoxazole (SMX) to initiate the reaction. During the reaction, a magnetic stirrer was used to stir the solution (500 rpm) to suspend the catalyst particles in the solution. At different time points, use a pipette to measure 1 mL of the solution, quickly filter the sample with a 0.22 μm filter membrane, add it to a liquid vial containing 100 μL of methanol and ascorbic acid, and determine the SMX concentration by high performance liquid chromatography. The removal rate of SMX can reach 83% within 5min (image 3 ).

[0044]Example 2

[0045]In high purity N2Atmosphere, Ti2AlN ceramic/Co(NO3)2The mixed powder with a molar ratio of 1:0.5 is reacted for 48 hours at a temperature of 1000℃, using 5M HNO3The powder was washed for 10 hours, centrifuged, and freeze-dried to obtain a catalyst Co@Ti loaded with monoatomic Co.2N (according to the EDS spectrum, the loading amount of monoatomic Co is 1.3%). Using a five-digit analytical balance, weigh 20 mg of the monoatomic Co-loaded catalyst and add it to a mixed solution (1000 mL) of 2 mM PMS and 10 μM SMX to initiate the reaction. During the reaction, a magnetic stirrer was used to stir the solution (500 rpm) to suspend the catalyst particles in the solution. At different time points, use a pipette to measure 1 mL of the solution, quickly filter the sample with a 0.22 μm filter membrane, add it to a liquid vial containing 100 μL of methanol and ascorbic acid, and determine the SMX concentration by high performance liquid chromatography. The removal rate of SMX can reach 74% within 1 min.