A kind of cobalt oxide/nitrogen co-doped carbon nanotube composite material and its preparation and application

A technology of carbon nanotubes and cobalt oxides, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high cost, limited application, complex synthesis process, etc., and improve the binding force , good effect and simple preparation process

Active Publication Date: 2020-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon materials can avoid secondary pollution caused by metal leaching, but often require further chemical modification or functionalization due to the lack of active functional groups, and the synthesis process is complex and costly, which strictly limits the use of these catalytic materials in activating persulfate to degrade organic pollution. Application of things

Method used

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  • A kind of cobalt oxide/nitrogen co-doped carbon nanotube composite material and its preparation and application
  • A kind of cobalt oxide/nitrogen co-doped carbon nanotube composite material and its preparation and application
  • A kind of cobalt oxide/nitrogen co-doped carbon nanotube composite material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 3g of dicyandiamide, 1.46g of cobalt nitrate and 0.5g of polyvinylpyrrolidone into 80mL of deionized water, stir magnetically for 10min until it is completely dissolved, then add 2.196g of urea into the reaction solution, stir for 30min, and put the mixture into an ultrasonic In the reactor, the ultrasonic power is 800W, the stirring speed is 700r / min, and the heating temperature is 80°C until it is completely dry. Then the resulting mixture was transferred to a tube furnace with a nitrogen atmosphere, the heating rate was 3°C / min, and the temperature was kept at 700°C for 3 hours. The obtained material was washed with 1mol / L hydrochloric acid to remove excess cobalt ions, and then washed three times with pure water, ethanol Wash three times, filter with suction, and dry in an oven at 60° C. for 4 hours to obtain a cobalt oxide / nitrogen co-doped carbon nanotube composite material.

Embodiment 2

[0037]Add 3g of dicyandiamide, 0.73g of cobalt nitrate and 0.5g of polyvinylpyrrolidone into 80mL of deionized water, stir magnetically for 10min until it is completely dissolved, then add 2.196g of urea into the reaction solution, stir for 30min, and put the mixture into the ultrasonic In the reactor, the ultrasonic power is 800W, the stirring speed is 700r / min, and the heating temperature is 80°C until it is completely dry. Then the resulting mixture was transferred to a tube furnace with a nitrogen atmosphere, the heating rate was 3°C / min, and the temperature was kept at 700°C for 3 hours. The obtained material was washed with 1mol / L hydrochloric acid to remove excess cobalt ions, and then washed three times with pure water, ethanol Wash three times, filter with suction, and dry in an oven at 60° C. for 4 hours to obtain a cobalt oxide / nitrogen co-doped carbon nanotube composite material.

Embodiment 3

[0039] Add 3g of dicyandiamide, 1.24g of cobalt acetate and 0.5g of polyvinylpyrrolidone into 80mL of deionized water, stir magnetically for 10min until it is completely dissolved, then add 2.196g of urea into the reaction solution, stir for 30min, and put the mixture into an ultrasonic In the reactor, the ultrasonic power is 800W, the stirring speed is 700r / min, and the heating temperature is 80°C until it is completely dry. Then the resulting mixture was transferred to a tube furnace with a nitrogen atmosphere, the heating rate was 3°C / min, and the temperature was kept at 700°C for 3 hours. The obtained material was washed with 1mol / L hydrochloric acid to remove excess cobalt ions, and then washed three times with pure water, ethanol Wash three times, filter with suction, and dry in an oven at 60° C. for 4 hours to obtain a cobalt oxide / nitrogen co-doped carbon nanotube composite material.

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Abstract

The invention discloses a cobalt oxide / nitrogen co-doped carbon nanotube composite material and a preparation and an application thereof. The specific steps of preparation are as follows: a certain proportion of carbon source and nitrogen source dicyandiamide and cobalt salt are taken as raw materials, urea is taken as an alkali source to adjust the solution to alkaline, polyvinylpyrrolidone is used as a surfactant in a ultrasonic reaction instrument for a full mixing reaction and is heat to dryness, and an obtained mixture is carbonized, pickled, and washed with water to obtain a material encapsulated in nitrogen-doped carbon nanotubes with cobalt oxide. The material has novel structure, simple and easy acquisition of raw materials, simple process, clean reaction process and no secondarypollution. The material is applied to the degradation and removal of phenol in water, the method is simple and the removal effect is good, and for treating phenol with a concentration of 0.1 mmol / L, the removal rate of phenol can reach 99% within 20 minutes.

Description

technical field [0001] The invention relates to the field of preparation technology of catalytic materials for heterogeneous catalytic activation of persulfate, in particular to a cobalt oxide / nitrogen co-doped carbon nanotube composite material and its preparation method and its application in catalytic degradation of phenol. Background technique [0002] Advanced oxidation technology based on sulfate radicals is a very important method for advanced treatment of refractory organic pollutants, and has broad application prospects in the field of water treatment. Sulfate radicals can be generated by activating persulfate through light, microwave, heating, transition metal ion catalysis, etc., but photoactivation and microwave activation have strict requirements on equipment and technology. Ionic catalysis has problems such as secondary pollution, difficult separation, and poor reusability. The heterogeneous catalytic activation of persulfate has the advantages of low equipmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/72C02F101/34
CPCB01J27/24C02F1/725C02F2101/345
Inventor 杨卫春姜智柴立元李超芳李星瑶王海鹰肖睿洋刘恢廖骐
Owner CENT SOUTH UNIV
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