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Preparation and application of imine type COF and TiO2-based heterojunction photocatalyst supported by imine type COF

A photocatalyst and imine-type technology, which is applied in the field of preparation of TiO2-based heterojunction photocatalysts, can solve the problem of high energy consumption, and achieve the effects of low energy consumption, excellent cycle stability, and low cost

Active Publication Date: 2021-10-19
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a lack of 2 High-efficiency COF materials with good combination, nanoscale and energy-level structure matching and their composite photocatalysts for the treatment of real micro-pollutants in water
[0004] Although there are many physical and chemical methods for the photodegradation of pollutants in water, for example, patent CN111573817 A discloses a method for degrading AAP using the Fenton method, which uses iron (Fe) and graphitized carbon nitride (g-C 3 N 4 ) was synthesized by doping at a high temperature of 550°. When the catalyst dosage was (1.0g / L), the AAP dosage was 100mL (50μM≈7.5mg / L), and the oxygen content was 7.8mg / L, the ultrasound was turned on for AAP The degradation efficiency is only 90% in 30 minutes. This treatment method achieves the effective degradation of AAP to a certain extent, but the preparation of the catalyst material used in this method requires high temperature, and the degradation requires ultrasound and oxygen in the solution, and the energy consumption is relatively high. High, there is still room for further improvement in degradation efficiency
In addition, among the currently reported photocatalytic composite materials, it is not found that the degradation efficiency of RhB, MO, AAP, and SMX can reach more than 95% within 30 minutes under the condition that the pollutant concentration is 10 mg / L. photocatalyst

Method used

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  • Preparation and application of imine type COF and TiO2-based heterojunction photocatalyst supported by imine type COF
  • Preparation and application of imine type COF and TiO2-based heterojunction photocatalyst supported by imine type COF
  • Preparation and application of imine type COF and TiO2-based heterojunction photocatalyst supported by imine type COF

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This example provides an imine type COF material and a preparation method thereof. figure 1 Schematic diagram for synthesis route.

[0050] The imine type COF material of this example is the compound shown in the formula:

[0051]

[0052] The preparation method includes the steps of:

[0053] (1) Preparation of melem (Melem): 5 g of melamine is put into the muffle for 4 hours at 425 ° C, and the temperature rise rate is 7 ° C / min, and the light yellow powder is obtained, that is, honeymine MELEM:

[0054] (2) Preparation of imine type COF material: 480 mg of terephthalide (PDA) and 520 mg honey-perisole (melem) were dissolved in 30 ml 1,4-dioxane and average toluene (volume ratio 4: 1 In the mixed solution, stirred at room temperature for 1 h, forming a uniform suspension, and 1.8 ml of acetic acid (herein, representing acetic acid / melem molar ratio 10: 1), heated to 110 ° C for 72 h to the end of the reaction There is a pale yellow solid, centrifugal separation pro...

Embodiment 2

[0056] Basically, the difference is: the preparation of imine type COF material: 480 mg of terephthalide (PDA) and 520 mg honey-mine (MELEM) is dissolved in 30 ml 1,4-dioxane and all three In a mixed solution of toluene (volume ratio of 3: 1), stirred at room temperature for 1 h, forming a uniform suspension, under a nitrogen atmosphere, adding 1..4 ml of acetic acid, heating to 120 ° C, lasting 72 h to the end, there is The pale yellow solid was produced, the product was centrifuged 4 times with tetrahydrofuran and ethanol, respectively, and the product was dried overnight, and the product was a pale yellow powder, which is animide COF material (simply as MPDA-COF-2).

Embodiment 3

[0058] Basically, the difference is: the preparation of imine type COF material: 480 mg of terephthalide (PDA) and 520 mg honey-mine (MELEM) is dissolved in 30 ml 1,4-dioxane and all three In a mixed solution of toluene (volume ratio of 4: 1), stirred at room temperature for 1 h, forming uniform suspension, under a nitrogen atmosphere, adding 1.8 ml of acetic acid, heated to 120 ° C, lasting 72 h to the end, there is light yellow The solid was produced, the centrifugal separation product was washed 4 times with tetrahydrofuran and ethanol, and the overnight was dried overnight, respectively, and the product was a pale yellow powder, which is animide COF material (simply as MPDA-COF-3).

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Abstract

The invention relates to preparation and application of an imine type COF and a TiO2-based heterojunction photocatalyst carried by the imine type COF. The imine type COF material is a compound shown in the following formula structure, in the formula, n is an integer selected from 1-5. The preparation method comprises the following steps: dissolving compounds in an organic solvent, adding acetic acid under the protection of protective gas, conducting heating to 110-130 DEG C, and conducting reacting to obtain an imine type COF material. TiO2 is directly added in the process of preparing the imine type COF material, so that the TiO2-based heterojunction photocatalyst is generated in situ; and the TiO2-based heterojunction photocatalyst is applied to degradation of water pollutants. According to the TiO2-based heterojunction photocatalyst and the preparation method thereof, effective separation of photo-induced electron-hole pairs and improvement of photocatalytic performance are achieved, the TiO2-based heterojunction photocatalyst is particularly suitable for degrading water pollutants such as rhodamine B, methyl orange and acetaminophen, and the degradation effect is excellent.

Description

Technical field [0001] The present invention belongs to the conjugated organic frame material and photocatalyst technology, and it is related to animide type COF and its carrying TiO. 2 Preparation and Application of Based Light Enamel Catalyst. Background technique [0002] Photocatalytic technology provides the likelihood of using renewable solar energy promotion under gentle conditions, which has been tried by developed countries to address environmental pollution in water, air, soil. Photocatalytic technology is a very effective way to degrade, causing widespread concern around the world. TiO 2 As the first photocatalytic semiconductor material, it has been widely studied in the field of photocatalytic degradation due to its good chemical stability, low cost, non-toxic and environmentally friendly properties. But due to TIO 2 The light absorption wavelength range is narrow, only in response to the ultraviolet light region, resulting in low solar utilization rate, high carrier...

Claims

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Application Information

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IPC IPC(8): C08G12/26B01J31/06B01J21/06C02F1/30C02F101/34C02F101/38
CPCC08G12/26B01J31/063B01J21/063C02F1/30C02F2305/10C02F2101/308C02F2101/34C02F2101/38C02F2101/40C02F2101/345B01J35/23B01J35/39Y02W10/37
Inventor 蔡一啸葛世洁边树昌王建华吉鹏王乐王华平
Owner DONGHUA UNIV