Preparation and application of conductivity-controllable fly ash-based geopolymer material

A technology of fly ash and conductivity, applied in the degradation of dyes, the conductivity can be adjusted in the field of preparation of fly ash-based geopolymer semiconductor materials, and can solve the problem of geopolymerization of fly ash that has not been found to modulate alkali with carbon black Preparation methods of semiconductor materials and other issues

Inactive Publication Date: 2016-06-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] To sum up, the inventor systematically consulted a large number of domestic and foreign documents and patents, and did not find any preparation methods for carbon black-modulated alkali-activated fly ash geopolymer semiconductor materials, and their application in the degradation of organic dyes. any relevant reports

Method used

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  • Preparation and application of conductivity-controllable fly ash-based geopolymer material
  • Preparation and application of conductivity-controllable fly ash-based geopolymer material
  • Preparation and application of conductivity-controllable fly ash-based geopolymer material

Examples

Experimental program
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Effect test

preparation Embodiment 1

[0080] Accurately take by weighing 300g of the fly ash raw material, take this as the measurement basis (100%), adopt the external mixing method, the solid potassium hydroxide dosage is 7% of the fly ash quality, and the sodium silicate nonahydrate dosage is the fly ash 15% of the mass, the mass of water is 30% of the mass of fly ash.

[0081] Weigh water according to the formula amount, dissolve solid sodium silicate nonahydrate and solid potassium hydroxide in water, pour the prepared potassium hydroxide solution and sodium silicate nonahydrate solution into a double-rotation double-speed slurry mixer, and then add Stir the fly ash to form a uniform slurry through chemical reaction; put the slurry into a triple mold of 3cm (width) × 4cm (height) × 5cm (length), vibrate it on the mortar vibrating table, and then Insert 4 pieces of galvanized stainless steel electrodes at equal distances [specification: 2cm (width) × 3cm (length)], seal them with a plastic film sealing bag, pl...

preparation Embodiment 2

[0083] Accurately weigh 300g of the fly ash raw material, take this as the measurement basis (100%), adopt the external mixing method, the content of carbon black is 0.5% of the mass of the fly ash, and the content of solid potassium hydroxide is the mass of the fly ash 7%, the content of solid sodium silicate nonahydrate is 15% of the mass of fly ash, and the mass of water is 32% of the mass of fly ash.

[0084] Weigh the water according to the formula, dissolve the solid sodium silicate nonahydrate and solid potassium hydroxide in water, and prepare the prepared potassium hydroxide solution and sodium silicate nonahydrate solution.

[0085] Pour the fly ash and carbon black into the mixer for full stirring and evenly mixing; pour the mixed alkali solution of potassium hydroxide and sodium silicate nonahydrate into the double-turn double-speed pure slurry mixer and thoroughly mix the fly ash and carbon black. Mixing, and the remaining steps are the same as in Example 1, to ob...

preparation Embodiment 3

[0087] All the operation steps are the same as in Example 2, except that the amount of carbon black is 1.5% of the mass of the fly ash, and the quality of water is 35% of the mass of the fly ash. FlyAshGeopolymer, abbreviated as: FAG) semiconductor material test block (marked as: 1.5CCB / FAG), such as image 3 shown. The 3d compressive strength was measured to be 44.3MPa, and the conductivity of the prepared fly ash-based geopolymer semiconductor material test block at 3d, 7d, 14d and 28d at different ages was detected by the four-electrode method. The results are shown in the table. 2 shown.

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Abstract

The invention discloses a preparation method of a conductivity-controllable fly ash-based geopolymer semiconductor material. The preparation method comprises the following steps: putting fly ash, carbon black, sodium silicate nonahydrate and an aqueous solution of potassium hydroxide into a stirring device and mixing; and forming with a mould and curing to obtain the conductivity-controllable fly ash-based geopolymer semiconductor material, wherein the dosage of the sodium silicate nonahydrate, potassium hydroxide, carbon black and water accounts for 15%, 7%, 0.5-4.5% and 30-40% of the fly ash mass respectively; the stable conductivity of the prepared fly ash-based geopolymer semiconductor material can be controlled in a range from 0.00025 to 0.65 (S/m) in a curing age of 28 days; and when the prepared conductivity-controllable fly ash-based geopolymer semiconductor material is used as a novel photocatalyst for degrading malachite green organic dye, a change law that the conductivity of the material is directly proportional to the degradation rate of the dye is discovered. The preparation technology is simple, the cost is low, the discharge of three wastes is avoided in the preparation process, and the conductivity-controllable fly ash-based geopolymer semiconductor material can be used as a dye degrading high-activity catalyst.

Description

technical field [0001] The invention belongs to the field of preparation of silicate catalysts and the resource utilization of solid wastes, and in particular relates to a preparation method of a fly ash-based ground polymer semiconductor material with adjustable electrical conductivity and its application in dye degradation. Background technique [0002] my country is a country with coal as the main energy source, a large amount of coal is used for thermal power generation, and thermal power generation accounts for 76% of the country's total power generation. Fly ash is the fine fly ash collected by coal-fired flue gas after being collected by the dust collector; [0003] According to the National Development and Reform Commission's 2014 Annual Report on Comprehensive Utilization of Resources in China, my country's fly ash emissions in 2013 were about 580 million tons [1], and the cumulative stockpile was about 2.7 billion tons, occupying 270,000 mu of land. The huge stock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26C04B12/00
CPCC04B7/243C04B12/005Y02P40/10
Inventor 张耀君张科张力张懿鑫余淼康乐杨梦阳
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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