a double bi 4 o 5 i 2 Preparation method of photocatalytic material and its application in degrading mc-lr

A catalytic material and visible light technology, applied in the direction of organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of light absorption of unfavorable composite photocatalytic materials and shrink heterojunction Response range, poor photocatalytic activity and other problems, to achieve the effect of improving photocatalytic activity, facilitating the transport of photogenerated carriers, and large specific surface area

Active Publication Date: 2022-03-25
CHANGZHOU UNIV
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AI Technical Summary

Problems solved by technology

In existing research, with Bi 4 o 5 I 2 (KI) TiO forms a heterojunction 2 , g-C 3 N 4 etc., where the traditional TiO 2 Photocatalytic materials only respond to UV light, and Bi 4 o 5 I 2 Recombination will reduce the visible light response range of the heterojunction, and the blue shift of light absorption will occur, which is not conducive to the light absorption of composite photocatalytic materials; g-C 3 N 4 Most of them are in the bulk phase (stacked phase), with a small specific surface area, which results in fewer active sites and poor photocatalytic activity. In addition, the band gap energy is high, and photogenerated electrons need higher energy to be excited, making the excitation of g-C 3 N 4 / Bi 4 o 5 I 2 The energy of the composite is higher than the excited Bi 4 o 5 I 2 energy of

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  • a double bi <sub>4</sub> o <sub>5</sub> i <sub>2</sub> Preparation method of photocatalytic material and its application in degrading mc-lr
  • a double bi <sub>4</sub> o <sub>5</sub> i <sub>2</sub> Preparation method of photocatalytic material and its application in degrading mc-lr
  • a double bi <sub>4</sub> o <sub>5</sub> i <sub>2</sub> Preparation method of photocatalytic material and its application in degrading mc-lr

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Experimental program
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Effect test

Embodiment 1

[0033] Preparation of Bi 4 o 5 I 2 (KI) Precursor of catalytic material: weigh 2mmol of Bi(NO 3 ) 3 ·5H 2 O was dispersed in 20 mL of glycerol, 2 mmol of KI was dissolved in 20 mL of glycerol, and then the KI solution was added dropwise to Bi(NO 3 ) 3 ·5H 2 In the O solution, keep stirring to obtain a uniformly dispersed bright orange-red liquid, which is poured into a polytetrafluoroethylene-lined reactor for solvothermal reaction (160 ° C, 16 h), then naturally cooled to room temperature, centrifuged , washed alternately with absolute ethanol and deionized water for 3 to 4 times, and finally freeze-dried at -62°C for 1 h to obtain a dark yellow, powdery precursor.

Embodiment 2

[0035] Preparation of Bi 4 o 5 I 2 (KI): Weigh 0.3g of the above precursor into a beaker filled with 200mL deionized water, put the beaker into an oil bath, and after 24 hours of hydrolysis reaction at low temperature (45°C), the color of the solution changes from dark yellow to bright orange Yellow, then washed with deionized water for 3 to 4 times, and finally dried at 80°C for 10 hours to obtain bright orange, powdery Bi 4 o 5 I 2 (KI).

[0036] Bi 4 o 5 I 2 (KI) specific surface area (62.32m 2 / g), the maximum absorption wavelength is 515nm, and the photocatalyst has good stability (5 cycles of experiments, no significant reduction in photocatalytic activity).

Embodiment 3

[0038] Bi 4 o 5 I 2 ([Hmim]) I) preparation: take by weighing 0.0485g Bi(NO 3 ) 3 ·5H 2 O was dispersed in 20mL mannitol solution (0.1M), magnetically stirred and dispersed uniformly to form a mixed solution A, and then 0.029g ionic liquid [Hmim]I (1-hexyl-3-methylimidazolium iodide) was weighed and dissolved in 20mL mannitol Form solution B in alcohol solution (0.1M), then add solution B dropwise to solution A, keep magnetic stirring during the dropping process and extend magnetic stirring for 30min, then adjust the pH of the mixed solution with sodium hydroxide solution (1M) =10.5, continue to maintain magnetic stirring for 30min, transfer the mixed solution to a 50mL polytetrafluoroethylene-lined reactor for solvothermal reaction (140°C, 20h), let it stand for 5h after natural cooling, pour off the supernatant, and use Alternately wash the mixture with water, ethanol and deionized water for 4 times, and finally dry the sample in a blast drying oven at 60°C for 12 hours...

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Abstract

The invention belongs to the field of photocatalysis and environmental protection, in particular to a double Bi 4 O 5 I 2 Preparation method of photocatalytic material and its application in degrading MC‑LR. A novel narrow-band semiconductor Bi by one-step solvothermal method 4 O 5 I 2 (KI is iodine source) and similar ultra-small semiconductor Bi 4 O 5 I 2 ([Hmim]) I is an iodine source) to compound to prepare a composite visible light catalytic material, which can promote the separation and transfer of semiconductor photogenerated electron-hole pairs, reduce its recombination probability, and improve photocatalytic efficiency. Applied to the field of eutrophic raw water treatment, it has a good application prospect. The photocatalytic degradation of microcystin (MC‑LR) has the advantages of no secondary pollution, efficient removal of pollutants, safety and stability, and low cost. It can completely degrade toxic organic pollutants such as MC‑LR.

Description

technical field [0001] The invention belongs to the field of photocatalysis and environmental protection, in particular to a double Bi 4 o 5 I 2 Preparation method of photocatalytic material and its application in degrading MC-LR. Background technique [0002] As a large amount of nutrient-rich industrial wastewater, domestic sewage and farmland drainage enter the water body, many water bodies in nature have become eutrophic. Cyanobacteria is a kind of harmful algae that grows widely and floats in water bodies. Microcystin (MC-LR) is a type of cyanotoxin released by toxin-producing cyanobacteria with the highest frequency, the largest amount, and the most serious damage, threatening Aquatic animals and human drinking water health. MC has a cyclic heptapeptide structure and is very stable in nature. It is still inactivated and non-volatile at a high temperature of 300°C. Traditional elimination methods are difficult to achieve the desired effect. The conventional coagula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06B01J31/02B01J35/10C02F1/30C02F101/34C02F101/38
CPCB01J27/06B01J31/0284B01J35/004B01J35/1014C02F1/30C02F2101/38C02F2101/34C02F2305/10
Inventor 王利平彭慧张秋亚蒋善庆许筠
Owner CHANGZHOU UNIV
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