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A kind of preparation method of visible light active g-c3n4/zn3(vo4)2 composite photocatalyst

A technology of g-c3n4 and VO4, which is applied in the field of preparation of g-C3N4/Zn32 composite photocatalyst, achieves the effect of short process, easy control of operation and high photocatalytic activity

Inactive Publication Date: 2018-10-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However for g-C 3 N 4 / Zn 3 (VO 4 ) 2 The construction and preparation of composite photocatalysts, and their application to photocatalytic degradation of dyes under visible light, have not been reported in the literature at home and abroad.

Method used

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  • A kind of preparation method of visible light active g-c3n4/zn3(vo4)2 composite photocatalyst
  • A kind of preparation method of visible light active g-c3n4/zn3(vo4)2 composite photocatalyst
  • A kind of preparation method of visible light active g-c3n4/zn3(vo4)2 composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 0.1 g of g-C 3 N 4 And 0.0226 g of Zn 3 (OH) 2 V 2 O 7 ·2H 2 O, then add 50 mL of deionized water together and stir for 0.5 h. Rotary evaporate the solution, dry under vacuum at 30°C, and finally calcinate at 300°C for 2.0 h, heating rate 3°C·min -1 , Get g-C 3 N 4 / Zn 3 (VO 4 ) 2 Sample, which contains Zn 3 (VO 4 ) 2 The mass ratio is 20%. Zn 3 (OH) 2 V 2 O 7 ·2H 2 O is formed by intersecting nanosheets with a size of 80~200 nm to form a three-dimensional structure.

[0027] Visible light for 5.0 h, the photodegradation efficiency of rhodamine B dye is 60.13%.

[0028] Attached image 3 Curve (a) is the solid ultraviolet graph of Example 1. As can be seen from the figure, and g-C 3 N 4 And Zn 3 (VO 4 ) 2 In contrast, the light absorption of the composite photocatalyst is red-shifted, and there is a strong absorption at 400-600 nm, indicating that the composite photocatalyst has a visible light effect.

Embodiment 2

[0030] Weigh 1.0 g of g-C 3 N 4 And 0.0113 g Zn 3 (OH) 2 V 2 O 7 ·2H 2 O, of which Zn 3 (OH) 2 V 2 O 7 ·2H 2 O is formed by intersecting nanosheets with a size of 80~200 nm to form a three-dimensional structure. Add 100 mL of deionized water and stir for 3.5 hours. The solution is rotary evaporated, dried at 40℃, and finally calcined at 350℃ for 2.5 hours. The heating rate is 4 ℃·min -1 , Get g-C 3 N 4 / Zn 3 (VO 4 ) 2 Sample, which contains Zn 3 (VO 4 ) 2 The mass ratio is 1%.

[0031] Visible light for 5.0 h, the photodegradation efficiency of rhodamine B dye is 65.47%.

[0032] Attached figure 1 (A) is the SEM image of Example 2.

Embodiment 3

[0034] Weigh 5.0 g of g-C 3 N 4 And 0.1691 gZn 3 (OH) 2 V 2 O 7 ·2H 2 O, of which Zn 3 (OH) 2 V 2 O 7 ·2H 2 O is formed by intersecting nanosheets with a size of 80~200 nm to form a three-dimensional structure. Add 150 mL of deionized water and stir for 6.0 h. The solution is rotary evaporated, dried at 50 ℃, and finally calcined at 350 ℃ for 2.5 h. The heating rate is 5 ℃·min -1 , Get g-C 3 N 4 / Zn 3 (VO 4 ) 2 Sample, which contains Zn 3 (VO 4 ) 2 The mass ratio is 3%.

[0035] With visible light for 5.0 h, the photodegradation efficiency of rhodamine B dye is 76.27%.

[0036] Attached figure 2 Curve (a) is the XRD pattern of Example 3. It can be seen from the figure that the composite photocatalyst g-C 3 N 4 / Zn 3 (VO 4 ) 2 G-C appears in the diffraction peaks 3 N 4 And Zn 3 (VO 4 ) 2 Characteristic peaks, indicating that the two are well combined together, because Zn 3 (VO 4 ) 2 The content is small, so the peak shape is not obvious.

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Abstract

The invention belongs to the field of preparation of nanocomposite materials and environmental management, and specifically discloses a preparation method of a binary g-C3N4 / Zn3(VO4)2 composite photocatalyst with visible light activity. This method uses g‑C3N4 and Zn3(OH)2V2O7·2H2O as raw materials, and uses a calcination method to prepare g‑C3N4 / Zn3(VO4)2 composite visible light photocatalysts with different proportions. The composite photocatalyst prepared by the invention can be used to degrade rhodamine B and methylene blue dye under visible light. The invention has the advantages of simple preparation method, low energy consumption, low cost, rich and clean raw materials, and mild reaction conditions. g‑C3N4 / Zn3(VO4)2 is a good visible light responsive composite photocatalyst. It is reported for the first time that g‑C3N4 / Zn3(VO4)2 composite photocatalyst shows excellent photocatalytic degradation activity in treating organic wastewater. It has important application prospects.

Description

Technical field [0001] The present invention relates to a g-C with visible light activity 3 N 4 / Zn 3 (VO 4 ) 2 The preparation method of the composite photocatalyst belongs to the field of nanocomposite material preparation and environmental treatment. Background technique [0002] With the continuous development of global industrialization, environmental pollution has become more and more serious, and environmental governance has become one of the most urgent problems in today's society, especially water environmental pollution, which has affected human life and the sustainable development of society. In recent years, photocatalytic oxidation technology based on metal oxide nanomaterials has provided a new way to treat wastewater and remove toxic substances in the environment. Common photocatalysts include titanium dioxide, bismuth vanadate, bismuth tungstate, silver phosphate and zinc vanadate, etc., all have excellent photocatalytic activity, and have good photodegradation fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J23/22B01J27/24C02F2305/10C02F2101/308B01J35/39Y02W10/37
Inventor 蒋银花田苏君黄刚林李凡刘佩佩张文莉
Owner JIANGSU UNIV
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