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Preparation method and application of Z-type photocatalyst MgAl LDH/CN-H

A photocatalyst, g-c3n4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of high photogenerated electron-hole recombination rate, narrow light absorption range, and poor utilization Advanced problems, to achieve the effect of improving the separation rate of photogenerated carriers and increasing the comparison area

Active Publication Date: 2019-06-07
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the above advantages, LDH has recently received extensive attention in the field of photocatalysis. However, the narrow light absorption range of a single LDH and the high photogenerated electron-hole recombination rate limit its photocatalytic performance; MgAl LDH is a wide bandgap semiconductor Material (E CBM =-0.61eV,E VBM =2.59eV) its light absorption range is in the ultraviolet region, and the utilization rate of the entire ultraviolet-visible region is not high

Method used

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  • Preparation method and application of Z-type photocatalyst MgAl LDH/CN-H
  • Preparation method and application of Z-type photocatalyst MgAl LDH/CN-H
  • Preparation method and application of Z-type photocatalyst MgAl LDH/CN-H

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Experimental program
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Effect test

Embodiment 1

[0034](1) Preparation of CN-H materials

[0035] Melamine was placed in a crucible with a lid, heated to 500°C in a muffle furnace at a rate of 2°C / min, kept for 2 hours, and then heated to 520°C for 2 hours. After cooling to room temperature, the yellow product was collected and ground into powder to obtain g-C 3 N 4 (marked as CN). 1g g-C 3 N 4 Disperse in 200ml of HNO 3 (8mol / L) solution, and refluxed at 90°C for 3h, cooled to room temperature, centrifuged and washed several times, and dried at 80°C overnight, and the sample powder was obtained after grinding, and the acidified g-C 3 N 4 Samples are labeled CN-H.

[0036] g-C 3 N 4 and TEM images of CN-H see figure 1 . From figure 1 It can be seen that the original g-C 3 N 4 It presents a thin layer with wrinkles (a layer with a large two-dimensional size), while CN-H presents a small flake shape, and there are relatively many pores between the small flakes. show that the acidification process makes g-C 3 N ...

Embodiment 2

[0044] (1) Preparation of CN-H materials

[0045] Melamine was placed in a crucible with a lid, heated to 500°C in a muffle furnace at a rate of 2°C / min, kept for 2 hours, and then heated to 520°C for 2 hours. After cooling to room temperature, the yellow product was collected and ground into powder to obtain g-C 3 N 4 (marked as CN). 1g g-C 3 N 4 Disperse in 200ml of HNO 3 8mol / L) solution, and refluxed at 95°C for 2h, cooled to room temperature, centrifuged and washed several times, and dried at 80°C overnight, and the sample powder was obtained after grinding, and the acidified g-C 3 N 4 Samples are labeled CN-H.

[0046] (2) Preparation of MgAl LDH material

[0047] 0.252g citric acid and 1.21g urea were added to the mixed solution of 60mL ethanol and water (V 乙醇 :V 水 =1:1), stirred for 30 minutes. Then add 1.026g of Mg(NO 3 ) 2 ·6H 2 O and 0.75g Al(NO 3 ) 3 9H 2 O, after being completely dispersed in the above solution, hydrothermally reacted at 160°C for...

Embodiment 3

[0061] (1) Preparation of CN-H materials

[0062]Melamine was placed in a crucible with a lid, heated to 500°C in a muffle furnace at a rate of 2°C / min, kept for 2 hours, and then heated to 520°C for 2 hours. After cooling to room temperature, the yellow product was collected and ground into powder to obtain g-C 3 N 4 (marked as CN). 1g g-C 3 N 4 Disperse in 200ml of HNO 3 (4mol / L) solution, and refluxed at 100°C for 1h, cooled to room temperature, centrifuged and washed several times, and dried at 80°C overnight, and the sample powder was obtained after grinding, and the acidified g-C 3 N 4 Samples are labeled CN-H.

[0063] (2) Preparation of MgAl LDH material

[0064] 0.126g citric acid and 0.605g urea were added to the mixed solution of 60mL ethanol and water (V 乙醇 :V 水 =1:1), stirred for 30 minutes. Then add 0.513g of Mg(NO 3 ) 2 ·6H 2 O and 0.375g Al(NO 3 ) 3 9H 2 O, after being completely dispersed in the above solution, hydrothermally reacted at 180°C ...

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Abstract

The invention belongs to the field of photocatalytic materials, in particular to a preparation method and application of a Z-type photocatalyst MgAl LDH / CN-H. The preparation method comprises the following steps: firstly, preparing g-C3N4, and preparing CN-H by acidizing and modifying g-C3N4; secondly, preparing MgAl LDH from raw materials of magnesium nitrate, aluminum nitrate, citric acid and urea by the hydrothermal reaction in an alcohol and water mixed system; and finally, assembling and forming the Z-type photocatalyst MgAl LDH / CN-H by the electrostatic attraction action of positively charged MgAl LDH and negatively charged CN-H. The prepared photocatalyst exhibits excellent photocatalytic performance under simulated solar irradiation, the degradation rate for tetracycline hydrochloride can reach to be more than 99%, and the degradation rate is 23 times higher than that of a single photocatalyst of g-C3N4 and 7.5 times higher than that of a single photocatalyst of MgAl LDH, so that the photocatalyst has relatively good application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, and in particular relates to a preparation method and application of a Z-type photocatalyst MgAl LDH / CN-H. Background technique [0002] With the overall improvement of the medical level of Chinese residents and the extensive use of drugs, especially antibiotics, many antibiotic pollutants remain in the water environment of our country. The removal of antibiotics has become an urgent problem to be solved. However, antibiotic wastewater has the characteristics of high concentration, large chroma, high toxicity and poor biodegradability. If traditional physical and chemical treatment methods are used, it will have high energy consumption and high cost. There are many shortcomings such as secondary pollution. At the same time, it is difficult for traditional chemical treatment processes and conventional treatment processes to completely degrade it until it is mineralized....

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
Inventor 薛金娟王明新李心瑶黄承娟宗玉清
Owner CHANGZHOU UNIV
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