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Method for generating reactive oxygen species by using Co-MOF-based macroscopic composite material to remove emerging contaminants

A composite material and macrobody technology, applied in the field of Co-MOFs-based macrobody composite materials to generate active oxygen species to remove emerging pollutants, can solve the problem of high cost of reuse

Active Publication Date: 2019-12-03
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Theoretically, with the help of the rich functional groups and microstructure information on the surface of the macroscopic carrier, the MOFs precursor can form a Co-MOFs-based macroscopic composite material through in-situ epitaxial growth. The high cost of reusing MOFs-based materials; however, previous literature searches have confirmed that there are few reports on the use of Co-MOFs-based macroscopic bulk composites to generate reactive oxygen species to remove emerging pollutants

Method used

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  • Method for generating reactive oxygen species by using Co-MOF-based macroscopic composite material to remove emerging contaminants
  • Method for generating reactive oxygen species by using Co-MOF-based macroscopic composite material to remove emerging contaminants
  • Method for generating reactive oxygen species by using Co-MOF-based macroscopic composite material to remove emerging contaminants

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Embodiment 1

[0020] A method for removing emerging pollutants (ECs) using Co-MOFs-based macroscopic bulk composites to generate reactive oxygen species (ROS) includes the following steps.

[0021] (1) Preparation of Co-MOFs-based macroscopic composites: a) 480 mM 2-methylimidazole methanol solution (first impregnation solution) and 60 mM cobalt nitrate methanol solution (second impregnation solution); b ) Put 60 g of spherical activated alumina (3~5mm) in the first soaking solution and soak for 30 minutes, remove it, and wash it with methanol for 3 times; c) Put the product obtained in step b) in the second soaking solution Take it out after soaking for 30 minutes, and wash it with methanol for 3 times; d) Put the product obtained in step c) in the mixed solution of the first soaking solution and the second soaking solution and soak it for at least 24 hours, then take it out, wash it with methanol and deionized water for 5 times each, and then dried at 105°C; e) Under aerobic conditions, t...

Embodiment 2

[0025] (1) To investigate the efficiency of Co-MOFs-based macroscopic composites to activate PMS to remove SMX from water: Measure 80 mL of SMX aqueous solution with a concentration of 10 mg / L in a clean reaction bottle, add ZA650 (20 g / L) and PMS (0.25 mM ), placed at room temperature (25±2°C) and stirred (300 rpm) for 60 min, and samples were taken at regular intervals for analysis.

[0026] (3) Draw the obtained data into a graph, such as image 3 It is shown that the ZA650 / PMS system can oxidize and remove more than 95% of SMX within 60 min; in addition, it can be seen from the figure that the adsorption of SMX by ZA650 or the oxidation of SMX by PMS alone is not the main reason for its removal during the entire reaction cycle. The removal of SMX was mainly achieved by the activation of PMS by ZA650 to generate reactive oxygen species.

Embodiment 3

[0028] (1) To investigate the efficiency of Co-MOFs-based macroscopic composites to activate PMS to remove resistant bacteria in water: Measure 80 mL of E. coli (carrying tetracycline resistance gene) aqueous solution with a concentration of 107 cfu / mL in a clean reaction bottle, add ZA450 (20 g / L) and PMS (1 mM), placed at room temperature (25 ± 2°C) and stirred (300 rpm) for 45 min, and samples were taken at regular intervals for analysis; the results showed that within 45 min, the ZA650 / PMS system could Completely remove tetracycline-resistant E. coli (and cannot be cultured after inactivation), while the removal of target resistant bacteria is less than 2.5log when ZA450 and PMS exist alone throughout the reaction cycle, and the removal of target resistant bacteria is mainly due to the activation of ZA450 PMS produces ROS due to the rapid destruction of its cellular structure and resistance genes.

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Abstract

The invention provides a method for generating reactive oxygen species (ROS) by using a Co-MOF-based macroscopic composite material to remove emerging contaminants (ECs). The method for generating theROS by using the Co-MOF-based macroscopic composite material to remove the ECs includes the following steps: 1) immersing a macroscopic carrier into a cobalt-containing MOF precursor solution, takingout the carrier, performing washing, performing drying, and performing calcination to obtain the composite material; 2) at room temperature, adding the above composite material into an aqueous solution containing a peroxide to generate a large amount of the ROS (-OH, SO4.-, O2.- and the like); 3) removing the ECs such as drugs, antibiotics and resistant bacteria / genes in water by using the ROS generated in the above process; and 4) treating the aged Co-MOF-based macroscopic composite material by using a peroxide aqueous solution to restore the activity of the composite material. The method provided by the invention can generate the ROS to efficiently remove the ECs in the water, and solves the problem that MOF materials are difficult to separate and recover and have high regeneration costs in the field of sewage / wastewater applications; and the composite material provided by the invention has environmental friendliness and broad market development potential.

Description

technical field [0001] The invention belongs to the field of metal-organic framework composite materials and emerging pollutant control, and in particular relates to a method for removing emerging pollutants by generating active oxygen species from a Co-MOFs-based macroscopic composite material. Background technique [0002] Metal organic frameworks (MOFs) and their derivatives, as new nano-functional materials for environmental remediation, have attracted extensive attention from researchers and environmental engineers at home and abroad. The most representative feature of MOFs-like porous materials is that their structure and properties can be regulated by changing the metal atoms and organic ligands in the framework structure. At present, more than 10,000 kinds of MOFs have been synthesized, and these materials are widely used in the fields of chemical liquid or gas separation, industrial catalysis, optoelectronics or semiconductors; screening and designing MOFs-based fun...

Claims

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Application Information

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IPC IPC(8): C02F1/72
CPCC02F1/722C02F1/725
Inventor 杨佳诚付明来祝敏平
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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