PDI/MOF heterojunction photocatalyst and preparation method and use method thereof

A photocatalyst and heterojunction technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve the problems of IOH waste water up to standard discharge, and achieve practical and feasible The effects of operability, mild preparation conditions and simple preparation process

Active Publication Date: 2021-04-30
NANJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional water treatment processes are difficult to discharge IOH wastewater up to standard, so findi

Method used

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  • PDI/MOF heterojunction photocatalyst and preparation method and use method thereof
  • PDI/MOF heterojunction photocatalyst and preparation method and use method thereof
  • PDI/MOF heterojunction photocatalyst and preparation method and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The PDI / MOF heterojunction photocatalyst of this embodiment is a PDI / MOF heterojunction photocatalyst activated persulfate system under visible light.

[0031] The preparation method of the PDI / MOF heterojunction photocatalyst of the present embodiment comprises the following steps:

[0032] (1) Put perylene-3,4,9,10-tetracarboxylic dianhydride, β-alanine and imidazole at a mass ratio of 1:1.8:10 in a four-necked flask under a nitrogen atmosphere at a temperature of 110°C Organic synthesis, adding ethanol and HCl at a mass ratio of 150:18 and stirring to obtain a stirred product;

[0033] (2) Filtrating and washing the stirred product to neutrality and drying to obtain PDI powder, wherein the filter membrane pore size is 0.22 μm, and the drying temperature is 60° C.;

[0034] (3) Vacuum activation of MIL-101 (Cr) material at 150°C;

[0035] (4) Prepare 50mL PDI stock solution, add triethylamine, stir for 30min, add MOF and then add 5mL HNO 3 solution, heated to 60°C ...

Embodiment 2

[0038] The PDI / MOF heterojunction photocatalyst of this embodiment is a PDI / MOF heterojunction photocatalyst activated persulfate system under visible light.

[0039] The preparation method of the PDI / MOF heterojunction photocatalyst of the present embodiment comprises the following steps:

[0040] (1) Put perylene-3,4,9,10-tetracarboxylic dianhydride, β-alanine and imidazole at a mass ratio of 1:1.8:10 in a four-necked flask under a nitrogen atmosphere at a temperature of 100°C Organic synthesis, adding ethanol and HCl at a mass ratio of 160:18 and stirring to obtain a stirred product;

[0041] (2) Filtrating, washing to neutrality and drying the stirred product to obtain PDI powder, wherein the filter membrane pore size is 0.45 μm, and the drying temperature is 50° C.;

[0042] (3) Vacuum activation of MIL-101 (Cr) material at 145°C;

[0043] (4) Prepare 50mL of PDI stock solution, add triethylamine, stir for 30min, add MOF and then add 3mL HNO 3 solution, heated to 60°C ...

Embodiment 3

[0046] The PDI / MOF heterojunction photocatalyst of this embodiment is a PDI / MOF heterojunction photocatalyst activated persulfate system under visible light.

[0047] The preparation method of the PDI / MOF heterojunction photocatalyst of the present embodiment comprises the following steps:

[0048] (1) Put perylene-3,4,9,10-tetracarboxylic dianhydride, β-alanine and imidazole at a mass ratio of 1:1.8:15 in a four-necked flask under a nitrogen atmosphere at a temperature of 105°C Organic synthesis, adding ethanol and HCl at a mass ratio of 155:18 and stirring to obtain a stirred product;

[0049] (2) Filtrating, washing to neutrality and drying the stirred product to obtain PDI powder, wherein the filter membrane pore size is 0.22 μm, and the drying temperature is 70° C.;

[0050] (3) Vacuum activation of MIL-101 (Cr) material at 155°C;

[0051] (4) Prepare 50mL of PDI stock solution, add triethylamine, stir for 30min, add MOF and then add 7mL HNO 3 solution, heated to 60°C ...

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Abstract

The invention discloses a PDI/MOF heterojunction photocatalyst and a preparation method and a use method thereof. The photocatalyst is prepared from the following raw material components: PDI, MIL-101 (Cr) and acid in a mass ratio of 1: 0.11-1: 37. According to the invention, perylene-3, 4, 9, 10-tetracarboxylic dianhydride, beta-alanine, imidazole and MOF are used as raw materials, PDI is obtained by an organic synthesis method, the PDI/MOF heterojunction photocatalyst is obtained by a water bath heating method, and the use method of the photocatalyst is provided, so that the prepared PDI/MOF photocatalyst has the characteristics of simple preparation process, high yield, large specific surface area and multiple reaction sites; and the use of hydrofluoric acid is avoided, and the material can activate persulfate under visible light to perform efficient catalytic degradation on iohexol in water.

Description

technical field [0001] The invention relates to a heterojunction photocatalyst and its preparation method and use method, in particular to a PDI / MOF heterojunction photocatalyst and its preparation method and use method. Background technique [0002] PDI is an n-type organic semiconductor that has a narrow bandgap (~1.69eV) and thus can absorb visible light. PDI can be self-assembled by adding acid to form an ordered structure, which is fixed by π-π stacking and weak interactions of hydrogen bonds. Self-assembled PDI (SA-PDI) has better photocatalytic activity than bulk PDI due to the red-shifted absorption sideband and shorter electron transport channel, but due to its narrower bandgap, its electron and space Holes are easy to recombine, so the photocatalytic oxidation ability of SA-PDI is limited. Most of the inventions about PDI are about constructing heterojunction photocatalysts, preventing the recombination of electrons and holes to improve photocatalytic performance...

Claims

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Application Information

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IPC IPC(8): B01J31/22C02F1/30C02F101/38
CPCB01J31/1691B01J31/182B01J31/223B01J35/004C02F1/30B01J2531/62C02F2305/10C02F2101/38Y02W10/37
Inventor 何欢季秋忆张利民武怡洁徐哲杨绍贵李时银
Owner NANJING NORMAL UNIVERSITY
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