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Method for microwave modulation of sludge-based hierarchical porous phosphorus-containing carbon for supercapacitor

A supercapacitor, hierarchical porous technology, applied in the fields of resources and environment, can solve the problems of low functional group richness, low specific surface area and total pore volume, etc., to optimize the microscopic pore structure, improve conductivity, and improve the effect of specific surface area.

Active Publication Date: 2022-04-26
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above technical problems, the present invention discloses a method for supercapacitors to use microwaves to modulate sludge-based hierarchical porous phosphorus-containing carbon, which solves the problem of low specific surface area and total pore volume caused by a single pore size in current carbon materials, and overcomes the current The problem of low richness of functional groups in carbon materials, which is used as an electrode material for supercapacitors, optimizes the energy storage capacity and efficiency of electrode materials, and also provides new ideas for the recycling of municipal sludge solid residues.

Method used

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  • Method for microwave modulation of sludge-based hierarchical porous phosphorus-containing carbon for supercapacitor
  • Method for microwave modulation of sludge-based hierarchical porous phosphorus-containing carbon for supercapacitor
  • Method for microwave modulation of sludge-based hierarchical porous phosphorus-containing carbon for supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) Preparation of mixed sludge-based carbonization products

[0049] Take the remaining sludge from the municipal sewage treatment plant, filter 60%-80% of the water, dry it in an oven at 105°C for 12h / 18h / 24h to constant weight, and use the rapid ashing method to determine the proportion of volatile matter and ash in the sludge , and the results are shown in Table 1. It can be seen that the mass percentage of volatile substances in the sludge is as high as about 50% (the average value is 50.10%), and the CaCO 3 , SiO 2 The ash content mainly composed of other inorganic components is about 49% (the average value is 49.20%).

[0050] Volatile matter and ash proportion result in the sludge of table 1 embodiment 1

[0051]

[0052] a. dry base

[0053] After the sludge and bamboo chips with a carbon content of 40% to 50% were broken respectively, 4g of bamboo chips and 4g of sludge were weighed with a balance (the mass ratio of bamboo chips to sludge was 1:1), and ...

Embodiment 2

[0058] On the basis of Example 1, the present embodiment is different in that: in step (1), take by weighing 6g bamboo chips and 2g sludge (the mass ratio of bamboo chips and sludge is 3:1) with balance, use planetary ball mill and Several medium and small grinding balls were added and mixed waste biomass powder was obtained after 34 minutes of treatment. Put it into a 25*25*120mm microwave magnetic boat, and send it into the microwave cavity under the protection of a nitrogen atmosphere of 120ml / min. After testing the airtightness, set the parameters for power-on microwave to 1100W, and the final temperature is 700°C. In the constant temperature mode for 5 minutes, cool to room temperature under nitrogen atmosphere to obtain mixed sludge-based carbonization products.

Embodiment 3

[0066] On the basis of Example 1, the difference of this example is that in step (2), 3g of the mixed sludge-based carbonization product is mixed with the potassium hydroxide activator according to the carbon content in a mass ratio of 1:5 and ball milled for 5 minutes, then loaded The absorbing magnetic boat is sent into the microwave cavity, under microwave irradiation, under the protection of nitrogen atmosphere, the target temperature is raised to 800°C in stages, the heating process is: 300-500°C, the heating power is 500-1000W, and the temperature control time is 20min ; 500-600℃ temperature range, heating power 600-1200W, temperature control time 20min; 600-700℃ temperature range, heating power 600-1200W, temperature control time 20min; 700-800℃ temperature range, heating power 600-1200W, The temperature control time is 20 minutes; stay in the temperature range of 800°C, the heating power is 600-1200W, and the holding time is 20 minutes to fully activate the reaction to ...

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Abstract

The invention provides a method for microwave modulation of sludge-based hierarchical porous phosphorus-containing carbon for a supercapacitor. The method comprises the following steps: step S1, taking sludge and drying; s2, crushing the sludge and the waste biomass, mixing and ball-milling to obtain mixed waste biomass powder; wherein the carbon content of the waste biomass is not lower than 40%, S3, performing microwave carbonization on the mixed waste biomass powder to obtain a carbonized product; s4, mixing the carbonized product with an activating agent, and then performing staged heating activation under microwave irradiation and inert gas protection to obtain a graded porous phosphorus-containing carbon material; wherein the activating agent is potassium hydroxide. By adopting the technical scheme, the specific surface area and the total pore volume of the carbon material are improved, the conductivity is improved, and the mass transfer resistance is reduced, so that the specific capacitance of a supercapacitor is improved, and the carbon material shows excellent electrochemical energy storage characteristics when being used as a supercapacitor electrode material; meanwhile, the resource utilization of the sludge is also realized.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for supercapacitors using microwaves to modulate sludge-based hierarchical porous phosphorus-containing carbon. Background technique [0002] Sludge is a complex mixture and it is difficult to recover and utilize energy from them due to their varying composition and properties. Moreover, due to the complex and uncontrollable components, and the stubborn and difficult to remove inorganic components such as silica, the sludge-based carbon material has poor conductivity, unadjustable microstructure, and underdeveloped pore structure, which limits its application in various fields such as energy storage. low rate. Therefore, how to effectively control the microstructure and physical and chemical properties of sludge-based carbon materials and improve their added value is one of the difficulties that need to be solved in this field. [0003] Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324C01B32/378H01G11/44H01G11/34H01G11/24
CPCC01B32/348C01B32/324C01B32/378H01G11/44H01G11/34H01G11/24Y02E60/13
Inventor 孙世昌马睿王艳宜徐星荷黄慧敏林俊豪罗娟
Owner SHENZHEN UNIV
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