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Preparation method of Cu3B2O6/g-C3N4 (cupric borate/graphitic carbon nitride) heterojunction photocatalyst and method for degrading methylene blue dye wastewater

A photocatalyst, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of low utilization rate of visible light, easy recombination, low quantum efficiency, etc. Achieve the effect of improving visible light catalytic efficiency, enhancing absorption, and improving quantum efficiency

Inactive Publication Date: 2016-08-24
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of most semiconductor photocatalysts is limited by the same problem: ① the band gap is too wide to respond to the ultraviolet region of less than 5% of solar radiation, and the utilization rate of 47% of visible light in solar energy is very low; ② price The potential of the band and conduction band is difficult to meet the site requirements of various catalytic reactions at the same time; ③ photogenerated electron-hole pairs are easy to recombine, and the quantum efficiency is very low
Copper borate (Cu 3 B 2 o 6 ) has been found to have certain photocatalytic properties in recent years, but its bandgap structure determines its low utilization rate of visible light

Method used

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  • Preparation method of Cu3B2O6/g-C3N4 (cupric borate/graphitic carbon nitride) heterojunction photocatalyst and method for degrading methylene blue dye wastewater
  • Preparation method of Cu3B2O6/g-C3N4 (cupric borate/graphitic carbon nitride) heterojunction photocatalyst and method for degrading methylene blue dye wastewater
  • Preparation method of Cu3B2O6/g-C3N4 (cupric borate/graphitic carbon nitride) heterojunction photocatalyst and method for degrading methylene blue dye wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 0.4991g of copper acetate and dissolve in 10mL of deionized water, then weigh 1.0507g of citric acid and dissolve in 10mL of deionized water, then slowly add the citric acid solution dropwise into the copper acetate solution, stir magnetically for 2 hours to make the copper ions and lemon Acid complexation is complete. Then, 40 mL of boric acid solution dissolved in 2.5 mmol was slowly added dropwise, and a uniform transparent blue sol was obtained after fully stirring for 2 hours. The sol was baked in an oven at 150° C. for 10 hours, and the water was evaporated to dryness to obtain a brown xerogel. Grind the xerogel into powder, move it to a muffle furnace, react in an air atmosphere at 900°C for 3 hours, take it out and grind it, and continue to react at 900°C for 2 hours. After the reaction, grind to obtain dark green Cu 3 B 2 o 6 powder. Put 5 g of melamine in a porcelain crucible with a cover, raise the temperature to 550° C. at a rate of 10° C. / min in a...

Embodiment 2

[0040] Weigh 0.04g of photocatalytic material (g-C 3 N 4 content of 40%) was dispersed in 100mL of 15mg / L methylene blue solution. Before light exposure, the catalyst-containing suspension was continuously stirred for 40 min in the dark to ensure that the adsorption-desorption equilibrium between the catalyst and the degradation pollutants was reached, and then 0.4 mL of HO was added dropwise. 2 o 2 , the sample concentration was taken as the initial concentration for degradation. During the photoreaction process, the methylene blue solution containing the catalyst was kept in a continuous stirring state, and samples were taken at regular intervals to measure the change of the methylene blue concentration with the reaction time. The experimental results showed that the concentration of methylene blue decreased by 81% after 60 minutes of light, and degraded after 90 minutes Completely, the solution becomes clear.

Embodiment 3

[0042] Weigh 0.10g of photocatalytic material (g-C 3 N 4 content of 60%) was dispersed in 100mL of 50mg / L methylene blue solution. Before light exposure, the catalyst-containing suspension was continuously stirred for 60 min in the dark to ensure that the adsorption-desorption equilibrium between the catalyst and the degradation pollutants was reached, and then 0.5 mL of H 2 o 2 , the sample concentration was taken as the initial concentration for degradation. During the photoreaction process, the methylene blue solution containing the catalyst was kept in a continuous stirring state, and samples were taken at regular intervals to measure the change of the methylene blue concentration with the reaction time. The experimental results showed that the concentration of methylene blue decreased by 62% after 60 minutes of light, and degraded after 100 minutes Completely, the solution becomes clear.

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Abstract

The invention discloses a preparation method of a Cu3B2O6 / g-C3N4 (cupric borate / graphitic carbon nitride) heterojunction photocatalyst and a method for degrading methylene blue dye wastewater. The preparation method comprises the following steps of using citric acid, copper nitrate and boric acid as raw materials of Cu3B2O6, using melamine as raw material of g-C3N4, and adopting a grinding-calcining preparation method to prepare the heterojunction photocatalyst; under the radiation condition by visible light, degrading the methylene blue dye wastewater by the heterojunction photocatalyst. The preparation method has the advantages that the visible light can be efficiently utilized, the requirement on equipment is low, the energy consumption is little, the operation cost is low, the removal rate of methylene blue is 100% within a short time, and the Cu3B2O6 / g-C3N4 heterojunction photocatalyst can be regenerated.

Description

technical field [0001] The invention belongs to the technical field of engineering materials and relates to a Cu 3 B 2 o 6 / g -C 3 N 4 A method for preparing a heterojunction photocatalyst and a method for using it to degrade methylene blue dye wastewater. The specific content is to use citric acid, copper acetate, boric acid and melamine as raw materials, and adopt a grinding-calcination preparation method to obtain Cu 3 B 2 o 6 / g -C 3 N 4 Heterojunction photocatalyst for degradation of methylene blue dye in wastewater under visible light conditions. Background technique: [0002] my country is a big country producing dyestuffs, and the output of dyestuffs ranks first in the world. At present, the discharge of dyestuff industrial wastewater has reached 157 million tons per year. According to the data of the 1998 Environmental Bulletin, the current treatment rate of industrial wastewater in my country is about 87.4%. As environmental pollutants, there are many kin...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/72C02F1/30
CPCC02F1/30C02F1/722C02F1/725B01J27/24C02F2305/02C02F2305/10C02F2101/308B01J35/39Y02W10/37
Inventor 罗斯王帆薛潮彭亮曾清如
Owner HUNAN AGRICULTURAL UNIV
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