| Antibiotics are constantly expanding in the field of medicine,which are widely used in the prevention/treatment of human diseases,meanwhile,also causes the abuse of antibiotics.The self-refractory characteristics of antibiotics,their drug resistance and toxic side effects have caused a series of social problems,exploring green and efficient removal/degradation treatment methods of water antibiotics has become a current research hotspot.Porous carbon materials have the advantages of high specific surface area,rich porosity,excellent mechanical properties,low production cost,and no toxic and side effects,which have broad application prospects in the fields of adsorption,catalysis,and energy storage.Single commonly mesoporous carbon materials have weak adsorption capacity,heteroelements,especially nitrogen-modified porous carbon can effectively enhance the performance of removing pollutants.In this paper,different nitrogen-doped carbon materials were prepared and the experimental process was characterized by X-ray photoelectron spectroscopy?XPS?,specific surface area and pore size distribution?BET?,scanning electron microscope?SEM?,etc.to test the performance of oxytetracycline adsorption.The main research contents are as follows:?1?Investigate the preparation of N-doped hierarchical porous carbon?NHPC?by acetone and adsorption properties for oxytetracycline:1-Alkyl-3-methyl imidazole bromide([C18Mim]Br),tetraethyl orthosilicate?TEOS?and resorcinol-formaldehyde were co-assembled to form a pleated sheet structure.[C18Mim]Br induced formation of the sheet structure and also led to N-doping in the carbon skeleton.TEOS created mesoporous structure and increased specific surface area,while acetone dissolved the oligomer of the resin,creating macroporous structure.At an appropriate amount of acetone,NHPC exhibited the hierarchical porous structure,high specific surface area and N-doping characteristics.The effects of different amounts of acetone on the structure,specific surface of NHPC were investigated.The results showed that the NHPC-0.3 had the highest specific surface area up to 1098 m2·g-1,and the nitrogen content was up to 2.22at%,The experiments had studied in detail the isothermal adsorption process,adsorption kinetics performance and cycle stability of NHPC.The results showed when the initial concentration was 80 mg L-1,the maximum adsorption capacity of NHPC-0.3 for oxytetracycline molecules was 125.65 mg·g-1.?2?Investigation on the preparation of nitrogen-doped core-shell carbon spheres?CNTs/CS?and adsorption properties for oxytetracycline:Carbon nanotubes?CNTs?were introduced during the synthesis of the st?ber system to form CNT-coated resin spheres.Ethylenediamine as catalyst,the catalytic rate is faster than ammonia.The resin core was formed first,and the remaining resin and CNTs formed a shell part under the action of cetyltrimethylammonium bromide?CTAB?.The CNTs/CS had a high specific surface area of up to 1503 m2·g-1,and the nitrogen content was up to 2.72 at%.The experiments had studied in detail of the isothermal adsorption process,adsorption kinetics performance and cycle stability of NHPC.The results showed that when the initial concentration was 80mg·L-1,the maximum adsorption capacity of NHPC-0.3 for oxytetracycline molecules was213.5 mg·g-1.?3?Investigation on the preparation nitrogen doped mesoporous carbon materials and its adsorption properties for oxytetracycline:Metal organic framework ZIF-8 has widely attracted attention due to its high specific surface area,rich N-doping and microporous structure.ZIF-8 and sodium silicate?Na2SiO3?were mixed and ground to obtain N-doped carbon material?M-ZIF-8x?with mesoporous structure.2-methylimidazole provided rich source of nitrogen and carbon for carbon material.M-ZIF-80.5.5 had a specific surface area of up to 2087 m2·g-11 and nitrogen content of up to 8.16 at%.M-ZIF-80.5.5 was used to adsorb oxytetracycline,and combined with adsorption kinetics and adsorption isotherm curve to further analyze the adsorption effect.When the initial concentration was 80 mg·L-1,the adsorption amount was as high as 274.8 mg·g-1. |
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