CN-121972177-A - Cobalt-molybdenum doped catalyst and preparation method and application thereof

Abstract

The disclosure provides a cobalt-molybdenum doped catalyst and a preparation method and application thereof, and belongs to the technical field of wastewater treatment. The cobalt-molybdenum doped catalyst comprises a porous carbon skeleton formed by polyethylene microplastic pyrolysis, and cobalt and molybdenum doped on the porous carbon skeleton. The heterogeneous catalyst is constructed by doping cobalt and molybdenum on the polyethylene microplastic pyrolytic carbon, so that the dissolution of Co n+ and Mo m+ can be effectively prevented, the stability of the catalyst is improved, meanwhile, the porous carbon skeleton has large specific surface area, rich pore structure and surface functional groups, and can provide additional adsorption sites and electron transfer channels, and a synergistic catalytic effect is generated with cobalt and molybdenum active sites.

Inventors

• JIAO WENTAO
• FENG ZHEN
• ZHANG CONGHUI
• SHAN YONGPING

Assignees

• 中国科学院生态环境研究中心

Dates

Publication Date

20260505

Application Date

20260121

Claims (10)

1. 1. The cobalt-molybdenum doped catalyst is characterized by comprising a porous carbon skeleton formed by polyethylene microplastic pyrolysis, and cobalt and molybdenum doped on the porous carbon skeleton.
2. 2. The cobalt molybdenum doped catalyst according to claim 1, wherein the cobalt is dispersed in zero valent form; The molybdenum bonds with the porous carbon skeleton to form a molybdenum carbon, or is doped in atomic form in the cobalt lattice.
3. 3. The cobalt-molybdenum doped catalyst according to claim 2, wherein the doping amount of cobalt is 0.5% to 1.5% and the doping amount of molybdenum is 0.5% to 1.5% based on the total mass percentage of the cobalt-molybdenum doped catalyst.
4. 4. The cobalt molybdenum doped catalyst according to claim 1, wherein the porous carbon framework exhibits a hollow nano-tubular structure.
5. 5. A method of preparing a cobalt molybdenum doped catalyst according to any one of claims 1 to 4, comprising: Dispersing polyethylene plastic powder and a dispersing agent in water, sequentially adding a molybdenum source and a cobalt source, and evaporating the mixture in a water bath to dryness to obtain a precursor; and pyrolyzing the precursor in an inert gas atmosphere to obtain the cobalt-molybdenum doped catalyst.
6. 6. The method according to claim 5, wherein the cobalt source comprises at least one of cobalt nitrate, cobalt chloride, and cobalt acetylacetonate; The molybdenum source comprises at least one of sodium molybdate and potassium molybdate; The dispersing agent is cetyl trimethyl ammonium bromide.
7. 7. The preparation method according to claim 6, wherein the mass ratio of the polyethylene plastic powder to the molybdenum element is 1 (0.005-0.015); The mass ratio of the polyethylene plastic powder to the cobalt element is 1 (0.005-0.015).
8. 8. The method according to claim 7, wherein the water bath is evaporated to dryness at a temperature of 60-80 ℃; The pyrolysis temperature is 700-900 ℃ and the pyrolysis time is 2-4h.
9. 9. Use of a cobalt molybdenum doped catalyst according to any of claims 1 to 4 in wastewater treatment for degrading antibiotic pollutants in wastewater.
10. 10. The use of claim 9, wherein the antibiotic contaminant comprises at least one of tetracycline, erythromycin, penicillin, and enrofloxacin.

Description

Cobalt-molybdenum doped catalyst and preparation method and application thereof Technical Field The disclosure relates to the field of wastewater treatment, in particular to a cobalt-molybdenum doped catalyst and a preparation method and application thereof. Background The antibiotic Enrofloxacin (ENR) has been widely used for the prevention and treatment of infectious diseases in animals as an antibacterial agent for animals. Medical wastewater generally contains high-concentration ENR, a large amount of sodium chloride and other salt ions, and the wastewater has the characteristics of high salt property, difficult degradation, strong durability, bioaccumulation and the like, can induce the generation and propagation of resistance genes in the environment, has strong toxic action on microorganisms, and forms a serious threat to aquatic ecosystems and human health. At present, technologies such as physical adsorption, biodegradation, advanced oxidation and the like are mainly adopted for removing ENR in high-salt wastewater, but the problems of low adsorption efficiency, inhibited microbial activity, easily quenched oxidant, high running cost and the like still exist in the practical application of the methods. Disclosure of Invention In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present disclosure provides a cobalt-molybdenum doped catalyst, and a preparation method and application thereof, and the technical solutions provided in the present disclosure are as follows. According to an embodiment of one aspect of the present disclosure, there is provided a cobalt-molybdenum doped catalyst comprising a porous carbon skeleton formed by pyrolysis of polyethylene microplastic, and cobalt and molybdenum doped on the porous carbon skeleton. According to an embodiment of another aspect of the present disclosure, there is provided a method for preparing a cobalt molybdenum doped catalyst, including: Dispersing polyethylene plastic powder and a dispersing agent in water, sequentially adding a molybdenum source and a cobalt source, and evaporating the mixture in a water bath to dryness to obtain a precursor; and (3) thermally decomposing the precursor in an inert gas atmosphere to obtain the cobalt-molybdenum doped catalyst. According to an embodiment of a further aspect of the present disclosure there is provided the use of a cobalt molybdenum doped catalyst in wastewater treatment for degrading antibiotic pollutants in wastewater. Based on the technical scheme, the cobalt-molybdenum doped catalyst provided by the disclosure has at least one of the following beneficial effects: (1) In the technical scheme of the disclosure, cobalt and molybdenum are doped on a porous carbon skeleton formed by pyrolysis of polyethylene microplastic, and thus the heterogeneous catalyst constructed can effectively inhibit dissolution of Co n+ and Mo m+, so that the stability of the cobalt-molybdenum doped catalyst (hereinafter referred to as the catalyst) is improved. The porous carbon skeleton has large specific surface area, rich pore structure and surface functional groups, can provide additional adsorption sites and electron transfer channels, and can synergistically enhance the catalytic efficiency with Co and Mo active sites. (2) In the technical scheme of the disclosure, the preparation method is simple and convenient to operate, does not need complex materials and equipment, has lower requirements on production conditions, does not generate pollution byproducts in the whole process, and accords with the green preparation concept. The catalyst has high yield and is beneficial to promoting industrialized application. Meanwhile, the prepared catalyst has the characteristics of large specific surface area, rich active sites, high catalytic activity and the like, and can remarkably improve the degradation efficiency of antibiotic pollutants in wastewater. Drawings The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments thereof with reference to the accompanying drawings in which: FIG. 1 is a schematic atomic structure diagram of a cobalt molybdenum doped catalyst (Co/Mo-C) of the present disclosure; FIG. 2 is an X-ray diffraction (XRD) pattern of cobalt-molybdenum doped catalyst (Co/Mo-C), molybdenum doped catalyst (Mo-C), cobalt doped catalyst (Co-C) and polyethylene microplastic pyrolytic carbon (PE-C) of test example 1 of the present disclosure; FIG. 3 is a Raman spectrum (Raman) diagram of cobalt-molybdenum doped catalyst (Co/Mo-C), molybdenum doped catalyst (Mo-C), cobalt doped catalyst (Co-C) and polyethylene microplastic pyrolytic carbon (PE-C) in test example 2 of the present disclosure; Fig. 4 is a graph showing the results of characterization of the microstructure, high-resolution structure and element distribution of the cobalt-molybdenum doped catalyst (Co/Mo-C)