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Preparation method and application of layered bismuth oxychloride visible-light photocatalyst

A bismuth oxychloride, visible light technology, applied in the field of visible light catalysis, can solve problems such as difficulty and limited application, and achieve the effects of reducing agglomeration, broad application prospects and high catalytic efficiency

Active Publication Date: 2017-12-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although DFT calculations reveal that adjusting the atomic number of Bi, O, and Cl can obtain new visible-light photocatalytic materials, the preparation of uniform Bi 12 o 17 Cl 2 There are still great difficulties, and the application has been very limited

Method used

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Embodiment 1

[0023] A kind of preparation method of layered bismuth oxychloride visible light catalyst of the present invention comprises the following steps: 2g Bi(NO 3 ) 3 ·5H 2 O and 0.02g of polyvinylpyrrolidone were added to 20mL of ethylene glycol, stirred for 10min using a magnetic stirrer, and simultaneously assisted by ultrasonic treatment to obtain phase A; 0.65g of NH 4 Cl and 1.95g NaOH were added into 120mL water and stirred for 3min to obtain phase B. Phase A and Phase B are mixed and then transferred to a hydrothermal reactor with polytetrafluoroethylene and heated at 140°C for 12h. After naturally cooling to room temperature, the resulting yellow powder was collected by filtration and washed three times with distilled water and absolute ethanol to remove residual ions and organic matter, and then the product was dried at 80 °C for 6 h to obtain layered bismuth oxychloride Bi 12 o 17 Cl 2 Visible light catalyst, bismuth oxychloride can also be called bismuth oxychloride...

Embodiment 2

[0025] A kind of preparation method of layered bismuth oxychloride visible light catalyst of the present invention comprises the following steps: 2g Bi(NO 3 ) 3 ·5H 2 O and 0.02g of polyvinylpyrrolidone were added to 20mL of ethylene glycol, stirred for 10min using a magnetic stirrer, and simultaneously assisted by ultrasonic treatment to obtain phase A; 0.65g of NH 4 Cl and 1.95g NaOH were added into 120mL water and stirred for 3min to obtain phase B. Phase A and Phase B are mixed and then transferred to a hydrothermal reactor with polytetrafluoroethylene and heated at 160°C for 12h. After naturally cooling to room temperature, the resulting yellow powder was collected by filtration and washed three times with distilled water and absolute ethanol to remove residual ions and organic matter, and then the product was dried at 80 °C for 6 h. layered bismuth oxychloride Bi 12 o 17 Cl 2 Visible light catalyst, the obtained product is a yellow flaky solid, which turns into a d...

Embodiment 3

[0029] Embodiment 3: Catalyst degrades tetracycline under visible light

[0030] An application of the layered bismuth oxychloride visible light catalyst prepared by the preparation method of the layered bismuth oxychloride visible light catalyst in degrading organic pollutant wastewater. With tetracycline as characteristic pollutant, the catalyst that is obtained by the preparation method of embodiment 1 and embodiment 2 carries out degradation experiment respectively, and wherein the concentration of tetracycline solution is 20mg / L; Get catalyst 100mg, be placed in the above-mentioned tetracycline-containing aqueous solution of 100ml .

[0031] In the solution, stir in a dark room for 60 minutes, then place the solution in a 300W (greater than 420nm) visible light source, irradiate for 1 hour, take 3ml tetracycline solution every 10 minutes, measure the concentration of tetracycline in the solution with UV-vis, and calculate the degradation rate. From Figure 4 a It can be...

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Abstract

The invention discloses a preparation method and an application of a layered bismuth oxychloride visible-light photocatalyst. The preparation method includes the steps of: dissolving bismuth nitrate and polyvinylpyrrolidone in ethylene glycol to form an A phase; dissolving ammonium chloride and sodium hydroxide in water to form a B phase; mixing the A phase and the B phase, performing a hydrothermal reaction to the mixed solution, and filtering, washing and drying the reaction product to obtain the layered bismuth oxychloride visible-light photocatalyst, molecular formula of the bismuth oxychloride being Bi12O17Cl2. The catalyst has good controllability and is easy to synthesize in large scale, and can be used for high-effectively degrading organic pollutants in wastewater.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, and relates to a preparation method of a layered bismuth oxychloride visible light catalyst and its application, in particular to a preparation method of a layered bismuth oxychloride visible light catalyst and its catalytic degradation of organic pollution in wastewater under visible light application of things. Background technique [0002] At present, with the shortage of fossil energy, the conversion of solar energy into chemical energy has gradually attracted the interest of researchers. Semiconductor photocatalysis technology is a catalytic reaction produced by photocatalysts under light irradiation, and it is a technology that can simulate photosynthesis in nature. Light can generate holes and electrons by exciting the surface of the photocatalyst, and the holes and electrons can carry out free radical transfer with water to generate oxygen, hydrogen, and also produce hydroxyl radic...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J37/10C02F1/30C02F1/72C02F101/30C02F101/38
CPCC02F1/30C02F1/725B01J27/06B01J37/10C02F2101/38C02F2101/40C02F2101/30C02F2305/10B01J35/39Y02W10/37
Inventor 曾光明周成赟黄丹莲赖萃张辰程敏胡亮熊炜平晏铭李志豪颜学磊
Owner HUNAN UNIV
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