Metal monatomic catalyst as well as preparation method and application thereof

A catalyst and metal technology, which is applied to a metal single-atom catalyst and its preparation method and application field, can solve the problems of increased chromaticity of effluent, high cost, leakage of metal ions, etc., and achieves the effect of reducing the dosage and solving the leakage of metal ions.

Active Publication Date: 2021-01-29
DONGGUAN UNIV OF TECH
9 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Among them, activation of persulfate by low-valence transition metal ions and their compounds is the earliest reported and most widely studied activation method, ...
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Abstract

The invention relates to a metal monatomic catalyst as well as a preparation method and application thereof, and belongs to the field of environmental protection. According to the preparation method of the metal monatomic catalyst, MAX-based ceramic powder with the chemical formula of Mn + 1AXn and inorganic salt powder of metal B are taken as raw materials, and the metal monatomic catalyst is prepared by using According to the method, anchoring preparation of the monatomic catalyst is achieved through a one-step method, and complex doping treatment does not need to be conducted on the carrier. Compared with an existing method for activating persulfate through transition metal ions and compounds of the transition metal ions, the method has the advantages that the adding amount of transition metal is remarkably reduced, and the problems of metal ion leakage, effluent chromaticity increase and sludge disposal can be solved.

Application Domain

Water contaminantsMetal/metal-oxides/metal-hydroxide catalysts +1

Technology Topic

Inorganic saltsActivated persulfate +9

Image

  • Metal monatomic catalyst as well as preparation method and application thereof
  • Metal monatomic catalyst as well as preparation method and application thereof
  • Metal monatomic catalyst as well as preparation method and application thereof

Examples

  • Experimental program(2)

Example Embodiment

[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 ).

Example Embodiment

[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.

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