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Preparation method of heterojunction photocatalyst for NADH regeneration

A photocatalyst and heterojunction technology, which is applied in the field of preparation of nano-photocatalytic materials, can solve the problems of difficulty in preparing black phosphorus, and achieve the effect of simple and easy preparation process and cheap preparation of raw materials.

Active Publication Date: 2018-09-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the most stable form of phosphorus allotropes, black scale can be transformed from red phosphorus under high temperature and pressure. Therefore, the preparation of black phosphorus is relatively difficult.

Method used

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  • Preparation method of heterojunction photocatalyst for NADH regeneration
  • Preparation method of heterojunction photocatalyst for NADH regeneration
  • Preparation method of heterojunction photocatalyst for NADH regeneration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: g-C supported by red phosphorus quantum dots 3 N 4 The preparation of nanotubes, the steps are as follows:

[0026] Step 1, g-C 3 N 4 The preparation of -NTs is the same as the preparation process of the comparative example;

[0027] Step 2, the red phosphorus of equal quality and the g-C that step 1 makes 3 N 4 -NTs were placed on both ends of a quartz boat, sealed with tin foil, placed in a tube furnace and filled with argon for 20 minutes, the airtight air pressure was 0.04 bar, and the heating program was set to increase the temperature from room temperature at a rate of 5°C / min. to 460°C and maintained for 3 hours, then lowered to 300°C for 30 minutes and maintained for 1 hour, and finally lowered to room temperature. During the vapor deposition process, red phosphorus was deposited into the hollow g-C 3 N 4 On the surface of nanotubes, the obtained red phosphorus quantum dots supported g-C 3 N 4 Nanotubes are heterojunction photocatalysts for NAD...

Embodiment 2

[0031] Example 2: g-C supported by red phosphorus quantum dots 3 N 4 The preparation of nanotubes, the steps of this embodiment and embodiment 1 are basically the same, the difference is: in step 2, red phosphorus and g-C 3 N 4 The mass ratio was changed from 1:1 to 0.5:1. Fig. 2 (a) and Fig. 2 (b) are the g-C that embodiment 2 prepares 3 N 4 - Transmission electron microscope (TEM) images of NTs@rP-QDs and corresponding EDS analysis. Table 2 is g-C prepared by embodiment 2 3 N 4 - Elemental analysis of NTs@rP-QDs. The g-C that embodiment 2 prepares 3 N 4 The NADH regeneration reaction of -NTs@rP-QDs had a conversion rate of 75.83±3.79% at 6 min equilibrium.

[0032] Table 2

[0033] element

Embodiment 3

[0034] Example 3: g-C supported by red phosphorus quantum dots 3 N 4 the preparation of nanotubes,

[0035] The steps of this embodiment are basically the same as in Example 1, the difference is that red phosphorus and g-C 3 N 4 The mass ratio was changed from 1:1 to 2:1. Fig. 3 (a) and Fig. 3 (b) are the g-C that embodiment 3 prepares 3 N 4 - Transmission electron microscope (TEM) images of NTs@rP-QDs and corresponding EDS analysis. Table 3 is g-C prepared by embodiment 3 3 N 4 - Elemental analysis of NTs@rP-QDs. The g-C that embodiment 3 prepares 3 N 4 The NADH regeneration reaction of -NTs@rP-QDs had a conversion rate of 80.45±4.02% at 6 min equilibrium.

[0036] table 3

[0037] element

[0038] Table 4

[0039] experiment

[0040] In summary, through the experiments of the above examples and their corresponding TEM images and EDS energy spectra, it was found that a g-C loaded with red phosphorus quantum dots synthesized by the preparation ...

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Abstract

The invention discloses a preparation method of a heterojunction photocatalyst for NADH regeneration. The preparation method comprises preparing a hexagonal prism melamine-cyanuric acid supramolecularcomplex from melamine and cyanuric acid in a water phase under the action of hydrogen bonding and pi-pi stacking, carrying out thermal treatment to further crystallize the supramolecular complex (abbreviated to CM) for keeping the morphology, roasting the supramolecular CM at a high temperature to obtain hollow tubular g-C3N4, and keeping the hexagonal prism shape. The novel visible light response semiconductor g-C3N4 is thermally stable at 500 DEG C and retains the chemical properties. In the vapor deposition process, red phosphorus is deposited on the surfaces of hollow g-C3N4 nanotubes byhigh temperature sublimation so that g-C3N4 nanotubes loaded with red phosphorus quantum dots (abbreviated to g-C3N4-NTs@rP-QDs) is produced. The preparation method utilizes cheap and easily availableraw materials and has simple and easy processes. Through change of the mass ratio of red phosphorus to g-C3N4 in the calcination deposition, the adjustment and control of red phosphorus content of g-C3N4-NTs@rP-QDs are realized.

Description

technical field [0001] The invention relates to a heterojunction photocatalyst for NADH regeneration and a preparation method thereof, belonging to the preparation technology of nanometer photocatalytic materials. Background technique [0002] As an important class of biocatalysts, oxidoreductases can usually catalyze redox reactions in organisms under relatively mild aqueous conditions, and can catalyze higher valence carbon molecules (CO 2 , formic acid, formaldehyde, etc.) into clean energy (such as methanol) through reductive hydrogenation. Compared with chemical synthesis, it is more convenient and environmentally friendly, and has unique and efficient specificity and stereoselectivity. However, many oxidoreductases need to consume one or more nicotinyl cofactors when they catalyze the reaction. The efficient supply of expensive coenzymes is one of the key technologies for oxidoreductase catalyzed reactions. Therefore, only by constructing an efficient NADH regeneratio...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/10B01J37/08
CPCB01J27/24B01J37/08B01J37/10B01J35/23B01J35/39
Inventor 石家福张旖珊姜忠义杨冬张少华
Owner TIANJIN UNIV
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