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Preparation method of bismuth-rich composite photocatalyst for treating oilfield flowback fluid

A technology of flowback liquid and composite light, applied in physical/chemical process catalysts, chemical instruments and methods, mining wastewater treatment, etc., can solve problems such as limited photocatalytic performance, reduce harm, improve utilization rate, and low cost Effect

Active Publication Date: 2020-08-04
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to improve the fixed energy band structure of a single bismuth-rich bismuth oxychloride, the technical problems of high electron-hole recombination efficiency and limited photocatalytic performance, and provide a simple and efficient method for preparing Bi 3 o 4 Cl / Bi 24 o 31 Cl 10 Composite photocatalyst method

Method used

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  • Preparation method of bismuth-rich composite photocatalyst for treating oilfield flowback fluid
  • Preparation method of bismuth-rich composite photocatalyst for treating oilfield flowback fluid
  • Preparation method of bismuth-rich composite photocatalyst for treating oilfield flowback fluid

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Embodiment 1

[0026] Weigh 1.455g of bismuth nitrate pentahydrate and dissolve them in 30mL of glycerol with an analytical balance, weigh 0.223g of potassium chloride and dissolve them in 35mL of glycerol, and add the potassium chloride solution to the above-mentioned nitric acid pentahydrate with a rubber dropper. Bismuth in glycerol solution, heated to 50°C, magnetically stirred at constant temperature for 40min, then transferred the mixed solution to a reaction kettle and reacted in an oven at 160°C for 16h, filtered to collect the precipitate after natural cooling. The precipitate was dried in an oven at 70° C. for 12 h to obtain a precursor. Weigh 0.3g of the precursor and add 100mL of distilled water, start stirring, heat in the water bath at 70°C, use 20% ammonia water to control the pH of the hydrolysis solution to 9, then stir the hydrolysis reaction at constant temperature for 16 hours, and measure it every 2 hours during the hydrolysis process The pH of the hydrolysis solution, i...

Embodiment 2

[0033] Weigh 1.455g of bismuth nitrate pentahydrate and dissolve them in 30mL of glycerol with an analytical balance, weigh 0.223g of potassium chloride and dissolve them in 35mL of glycerol, and add the potassium chloride solution to the above-mentioned nitric acid pentahydrate with a rubber dropper. Bismuth in glycerol solution, heated to 70°C, magnetically stirred at constant temperature for 30min, then transferred the mixed solution to a reaction kettle and reacted in an oven at 145°C for 16h, filtered to collect the precipitate after natural cooling. The precipitate was dried in an oven at 70° C. for 12 h to obtain a precursor. Weigh 0.5g of the precursor and add 100mL of distilled water, heat the water bath at 50°C, use 20% ammonia water to control the pH of the hydrolysis solution to 10, then stir the hydrolysis reaction at constant temperature for 16 hours, during the hydrolysis process, measure the pH of the hydrolysis solution every 2 hours , if the pH changes, you n...

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Abstract

The invention discloses a preparation method of a bismuth-rich composite photocatalyst for treating oilfield flowback fluid, and the method comprises the following steps: S1, dissolving bismuth nitrate pentahydrate in glycerol, and dissolving potassium chloride in another part of glycerol; S2, dropwise adding the potassium chloride solution into the bismuth nitrate pentahydrate solution, heating to 40-70 DEG C, and stirring for 30-50 minutes; S3, reacting the reaction solution at 140-160 DEG C for 15-16 hours, filtering, and drying to obtain a precursor; S4, adding the precursor into distilledwater, heating in a water bath at 40-70 DEG C, adjusting the pH value of the aqueous solution to 8-10 by using 20% ammonia water, then carrying out hydrolysis reaction for 12-20 hours, filtering to obtain a hydrolysate, and drying; and S5, calcining the dried hydrolysate in a muffle furnace at a constant temperature of 400-600 DEG C for 2-5 hours to obtain the Bi3O4Cl / Bi24O31Cl10 composite photocatalyst. Compared with existing Bi3O4Cl and Bi24O31Cl10 photocatalysts, the photocatalyst has better performance, and the catalyst can catalyze and oxidize hydroxypropyl guanidine gum waste liquid inoil field fracturing flow-back fluid under visible light.

Description

technical field [0001] The invention relates to the technical field of oil and gas field waste liquid treatment, in particular to a preparation method of a bismuth-rich composite photocatalyst used for photocatalytic oxidation treatment of oil field flowback liquid. Background technique [0002] Acid fracturing technology is an important technology to increase production and injection in oilfields. It uses chemical methods to configure certain reagents into fracturing fluids with a certain viscosity, and then uses high-pressure pumps to inject the viscous fluids into formations at high speed. When the injection rate of the pump is greater than the absorption rate of the formation, fractures will form in the formation, and the oil and gas in the reservoir in the formation will be driven out under a certain force, thereby increasing the oil recovery rate. At the same time, the fracturing injection injected during oil and gas production will also flow back to the ground, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/38C02F103/10
CPCB01J27/06C02F1/30C02F2101/38C02F2103/10C02F2305/10B01J35/39Y02W10/37
Inventor 张旭刘卫华杨萍焦国盈丁忠佩石书强王均黄小亮王琦杨博张瀛李祖友叶长青梁兵孙风景王捷吕虹
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY