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Preparation method for g-C3N4/Zn3(VO4)2 composite photocatalyst with visible-light activity

A technology of VO4 and catalyst, which is applied in the field of preparation of g-C3N4/Zn32 composite photocatalyst, achieves good degradation effect, is suitable for mass production and popularization, and has mild reaction conditions

Inactive Publication Date: 2016-12-07
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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  • Preparation method for g-C3N4/Zn3(VO4)2 composite photocatalyst with visible-light activity
  • Preparation method for g-C3N4/Zn3(VO4)2 composite photocatalyst with visible-light activity
  • Preparation method for g-C3N4/Zn3(VO4)2 composite photocatalyst with visible-light activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 0.1 g of g-C respectively 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, the solution is rotary evaporated, dried in vacuum at 30 °C, and finally calcined at 300 °C for 2.0 h with a heating rate of 3 °C min -1 , get g-C 3 N 4 / Zn 3 (VO 4 ) 2 Sample, wherein the sample contains Zn 3 (VO 4 ) 2 The mass ratio is 20%. Zn 3 (OH) 2 V 2 o 7 2H 2 O is composed of nanosheets with a size of 80–200 nm intersecting to form a three-dimensional structure.

[0027] The photodegradation efficiency of rhodamine B dye was 60.13% under visible light for 5.0 h.

[0028] attached image 3 Curve (a) is the solid UV diagram of Example 1. It can be seen from the figure that, with g-C 3 N 4 and Zn 3 (VO 4 ) 2 In contrast, the light absorption of the composite photocatalyst has a red shift, and there is a strong absorption at 400-600 nm, indicating that the composite photocatalyst has a visible lig...

Embodiment 2

[0030] Weigh 1.0 g of g-C respectively 3 N 4 and 0.0113 g Zn 3 (OH) 2 V 2 o 7 2H 2 O, where Zn 3 (OH) 2 V 2 o 7 2H 2 O is composed of nanosheets with a size of 80–200 nm intersecting to form a three-dimensional structure. Add 100 mL of deionized water and stir for 3.5 h. The solution is rotary evaporated, dried at 40 °C, and finally calcined at 350 °C for 2.5 h. The heating rate is 4 ℃·min -1 , get g-C 3 N 4 / Zn 3 (VO 4 ) 2 Sample, wherein the sample contains Zn 3 (VO 4 ) 2 The mass ratio is 1%.

[0031] The photodegradation efficiency of rhodamine B dye was 65.47% under visible light for 5.0 h.

[0032] attached figure 1 (a) is the SEM image of Example 2.

Embodiment 3

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

[0035] The photodegradation efficiency of rhodamine B dye was 76.27% under visible light for 5.0 h.

[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 The characteristic peaks, indicating that the two are well combined, due to the Zn 3 (VO 4 ) 2 The content is less, so the pea...

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Abstract

The invention belongs to the fields of nanometer composite material preparation and environmental governance, and specifically discloses a preparation method for a binary g-C3N4 / Zn3(VO4)2 composite photocatalyst with visible-light activity. According to the method, with g-C3N4 and Zn3(OH)2V2O7.2H2O as raw materials, a composite visible-light type photocatalyst of g-C3N4 and Zn3(VO4)2 in different proportions is prepared by adopting a calcination process. The composite photocatalyst prepared by using the method provided by the invention can be applied in degradation of rhodamine B and methylene blue dyes under visible light. The preparation method provided by the invention has the advantages of simplicity, low energy consumption, low cost, rich and clean raw materials, mild reaction conditions, etc. The g-C3N4 / Zn3(VO4)2 is a good visible-light responding type photocatalyst, and is reported for the first time; meanwhile, the g-C3N4 / Zn3(VO4)2 composite photocatalyst shows excellent photocatalytic degradation activity, and has great application prospects in the field of organic wastewater treatment.

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 invention discloses a method for preparing a composite photocatalyst, which belongs to the field of preparation of nanocomposite materials and environmental treatment. Background technique [0002] With the continuous development of global industrialization, the problem of environmental pollution is becoming more and more serious, and environmental governance has become one of the most urgent problems to be solved in today's society, especially water environmental pollution, which has affected human life and 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 of which...

Claims

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Application Information

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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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