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A g-c3n4/al2o3/zno heterojunction with visible light catalytic activity and its preparation method

A catalytic activity, g-c3n4 technology, applied in the field of g-C3N4/Al2O3/ZnO heterojunction and its preparation, can solve problems such as low quantum efficiency, and achieve the effects of simple preparation process, wide application and low cost

Active Publication Date: 2019-11-19
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

g-C 3 N 4 The generated photo-generated electrons can reduce oxygen molecules to generate ROS, but its own fast photo-generated electron-hole recombination efficiency leads to its low quantum efficiency.
Construction of heterojunction is an effective measure, but it mainly faces the following two problems: one is the energy band matching between the synthesized heterojunction components, and the other is its lattice matching. Only by satisfying the above two points can the photogenerated electrons be guaranteed in the Efficient Migration Between Heterojunctions
The difficulty is that g-C 3 N 4 It is difficult to achieve lattice matching with metal oxides (Zhu et al.Adv.Funct.Mater, 22(2012)1518-1524), such as g-C 3 N 4 With the same low price ZnO

Method used

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  • A g-c3n4/al2o3/zno heterojunction with visible light catalytic activity and its preparation method
  • A g-c3n4/al2o3/zno heterojunction with visible light catalytic activity and its preparation method
  • A g-c3n4/al2o3/zno heterojunction with visible light catalytic activity and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Follow the steps below to prepare g-C 3 N 4 / Al 2 o 3 / ZnO ternary heterojunction (the sample is marked as 50C / 40A / 10Z):

[0043] ①Dissolve 0.0047mol of aluminum nitrate in distilled water, then add 0.3g of g-C prepared in the laboratory 3 N 4 (see below for the preparation process), after stirring evenly, add 1 mol / L NaOH solution dropwise to the beaker until pH=8-9, and continue stirring for 1 hour;

[0044] ②Dissolve 0.00072mol of zinc nitrate in distilled water, drop it into the turbid solution prepared in step ① simultaneously with 1mol / L NaOH solution, keep the pH=8-9, and continue to stir for 1 hour.

[0045] ③ Suction filter, dry and grind the precipitate obtained in ② to obtain the precursor, which is calcined at 400°C to obtain the desired sample.

[0046] The samples were tested by XRD, UV-Vis DRS, FESEM and HRTEM respectively. The test patterns are shown in Fig. 1(a), figure 2 , image 3 and Figure 4 shown. Figure 1(a) XRD pattern shows that sampl...

Embodiment 2

[0071] Follow the steps below to prepare g-C 3 N 4 / Al 2 o 3 / ZnO (marked as 50C / 45A / 5Z) ternary heterojunction:

[0072] ①Dissolve 0.0053mol of aluminum nitrate in distilled water, then add 0.3g of g-C prepared in the laboratory 3 N 4 After stirring evenly, add 1mol / L NaOH solution dropwise to the beaker until pH=8-9, and continue stirring for 1 hour;

[0073] ②Dissolve 0.00036mol zinc nitrate in distilled water, and drop it into the turbid solution prepared in step ① simultaneously with 1mol / L NaOH solution, keep the pH=8-9, and continue to stir for 1 hour.

[0074] ③ Suction filter, dry, and grind the precipitate obtained in ② to obtain the precursor, which is calcined at 400°C to obtain the required sample 50C / 45A / 5Z.

[0075] The samples were tested by XRD and UV-Vis DRS respectively, and the test patterns are shown in Figure 1(b) and figure 2 shown. Figure 1(b) XRD pattern shows that sample B consists of g-C 3 N 4 , ZnO and Al 2 o 3 Composed of three parts, d...

Embodiment 3

[0079] Follow the steps below to prepare g-C 3 N 4 / Al 2 o 3 / ZnO (marked as 50C / 30A / 20Z) ternary heterojunction:

[0080] ①Dissolve 0.0035mol aluminum nitrate in distilled water, then add 0.3g of g-C prepared in Example 1 3 N 4 After stirring evenly, add 1mol / L NaOH solution dropwise to the beaker until pH=8-9, and continue stirring for 1 hour;

[0081] ②Dissolve 0.00144mol zinc nitrate in distilled water, and drop it into the turbid solution prepared in step ① simultaneously with 1mol / L NaOH solution, keep the pH=8-9, and continue stirring for 1 hour.

[0082] ③ Suction filter, dry and grind the precipitate obtained in ② to obtain the precursor, which is calcined at 500°C to obtain the desired sample 50C / 30A / 20Z.

[0083] The samples were tested by XRD and UV-Vis DRS respectively, and the test patterns are shown in Figure 1(b) and figure 2 shown. Figure 1(b) XRD pattern shows that the sample consists of g-C 3 N 4 , ZnO and Al 2 o 3 It consists of three parts.

...

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Abstract

The invention discloses a g-C3N4 / Al2O3 / ZnO ternary heterojunction material with visible light catalytic activity and a preparation method thereof. The g-C3N4 / Al2O3 / ZnO ternary heterojunction material comprises, by weight 50-70% of g-C3N4, 45-20% of Al2O3 and 5-20% of ZnO. The preparation method of the g-C3N4 / Al2O3 / ZnO ternary heterojunction material comprises: dissolving suitable aluminum nitrate in distilled water, adding prepared g-C3N4 powder, stirring well, dropwise adding NaOH solution until pH is 8-9, stirring, dissolving in zinc nitrate, dropwise adding NaOH solution to maintain pH to 8-9, continuing to stir, filtering by suction, drying, and grinding to obtain a sample precursor, and calcining at 400 DEG C to obtain the g-C3N4 / Al2O3 / ZnO ternary heterojunction material. The preparation method is simple, the raw materials are low in rice, complex equipment is not required, the process is free of pollution, and the material is suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, in particular to g-C with visible light catalytic activity 3 N 4 / Al 2 o 3 / ZnO heterojunction and its preparation method. Background technique [0002] o 2 It is the most environmentally friendly and green oxidant, and has broad application prospects in the fields of environmental purification, sterilization and organic synthesis. However, due to electron spin, O 2 It is difficult to directly act as an oxidizing agent. To activate O 2 , photocatalysis is a viable technology. Under light irradiation, the photocatalyst can generate photogenerated electron-hole pairs, and the photogenerated electrons can further oxidize O 2 Generate · O 2 - , thus further producing OH and H 2 o 2 , these oxygen-activated species (ROS) can function as oxidants. Most photocatalysts are compatible with TiO 2 same (You et al.Chem.Sci,5(2014)4123-4135), can activate oxygen to generate ROS, howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/30C02F101/34C02F101/38
CPCB01J23/002B01J27/24B01J35/004B01J35/02C02F1/30C02F2101/34C02F2101/38C02F2101/40C02F2305/10
Inventor 李发堂刘少佳郝影娟刘瑞红
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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