Preparation method and application of reduced graphene oxide/bismuth vanadate/carbon nitride composite material

A technology of graphite phase carbon nitride and composite materials, applied in the field of nanomaterials, can solve the problems of low catalytic efficiency of visible light, and achieve the effects of improving separation efficiency, environmental friendliness and low cost

Inactive Publication Date: 2017-10-10
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem of low visible light catalytic efficiency of bismuth vanadate / graphite-phase carbon nitride, the present invention provides a simple preparation method of reduced graphene oxide / bismuth vanadate / graphite-phase carbon nitride photocatalytic material

Method used

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  • Preparation method and application of reduced graphene oxide/bismuth vanadate/carbon nitride composite material
  • Preparation method and application of reduced graphene oxide/bismuth vanadate/carbon nitride composite material
  • Preparation method and application of reduced graphene oxide/bismuth vanadate/carbon nitride composite material

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Embodiment 1

[0030] (1) Graphite phase nitrogen carbide (g-C 3 N 4 ) Preparation:

[0031] g-C 3 N 4 The preparation adopts the method of thermally polymerizing urea; weigh 10g of urea in a semi-closed crucible, first place it in a 80°C drying oven for 48h to dry the raw materials, and then transfer the crucible to a temperature programmed tube furnace. It is heated to 500°C at a heating rate of 3°C / min for 3h. After natural cooling to room temperature, take it out, grind it to powder with a mortar, and use a concentration of 50mL 0.01mol·L -1 Dilute HNO 3 Wash 3 times to remove residual alkaline species, and then wash 3 times with deionized water and absolute ethanol. Finally, it was dried in an oven at 80°C for 12 hours.

[0032] (2) Preparation of reduced graphene oxide (RGO):

[0033] Firstly prepare graphene oxide (GO), weigh 80mL concentrated sulfuric acid and 0.6g sodium nitrate in a 500mL three-necked flask and stir evenly, ice bath to 0℃, add 1.0g natural flake graphite, and slowly add...

Embodiment 2

[0041] Step (1) and step (2) of this embodiment are the same as in embodiment 1;

[0042] (3) RGO / BVO 4 / g-C 3 N 4 Preparation of composite materials:

[0043] Weigh 1mmol Bi(NO 3 ) 3 ·5H 2 Add O to 0.04mol·L -1 HNO 3 Then add 0.4 g of sodium dodecyl sulfonate (SDS) dissolved in high-purity water to obtain solution A. Weigh 1mmol NH 4 VO 3 Add to NH 3 ·H 2 In O solution, slowly add the prepared solution A to NH while stirring 4 VO 3 In solution, use NH 3 ·H 2 O adjust the pH of the mixed solution to 7, and stir for 90 min to obtain a homogeneous solution. Weigh 100mg g-C 3 N 4 Add 5mg of RGO powder to the above homogeneous solution in sequence, and sonicate for 1h. The obtained solution was transferred to a hydrothermal reaction kettle lined with polytetrafluoroethylene, reacted at 200°C for 20 hours for hydrothermal reaction, centrifuged, washed with water and alcohol for three times, and dried at 60°C for 12 hours.

Embodiment 3

[0045] Step (1) and step (2) of this embodiment are the same as in embodiment 1;

[0046] (3) RGO / BVO 4 / g-C 3 N 4 Preparation of composite materials:

[0047] Weigh 1mmol Bi(NO 3 ) 3 ·5H 2 Add O to 0.04mol L -1 HNO 3 Then add 0.5 g of sodium dodecyl sulfonate (SDS) dissolved in high-purity water to obtain solution A. Weigh 1mmol NH 4 VO 3 Add to NH 3 ·H 2 In O solution, slowly add the prepared solution A to NH while stirring 4 VO 3 In solution, use NH 3 ·H 2 O adjust the pH of the mixed solution to 8, and stir for 90 min to obtain a homogeneous solution. Weigh 100mg g-C 3 N 4 Add 5mg of RGO powder to the above homogeneous solution in sequence, and sonicate for 1h. The obtained solution was transferred to a hydrothermal reactor lined with polytetrafluoroethylene, reacted at 220°C for 20 hours for hydrothermal reaction, centrifuged, washed with water and alcohol three times, and dried at 60°C for 12 hours.

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Abstract

The invention belongs to the field of nano-materials, and discloses a preparation method of a reduced graphene oxide/bismuth vanadate/carbon nitride Z-type heterojunction composite photocatalyst. The preparation method includes the steps: performing thermal polymerization on urea to prepare graphite phase nitride carbon (g-C3N4); preparing graphene oxide by a Hummers method, and further preparing reduced graphene oxide; preparing a reduced graphene oxide/bismuth vanadate/carbon nitride composite material by a hydrothermal method. The utilization rate of visible light is improved by constructing Z-type heterojunctions, and photoelectric cavitation complex rate is reduced. The material can be used for photodegradation antibiotic pollutants and is of great significance for environmental control.

Description

Technical field [0001] The invention belongs to the field of nano materials, and relates to a preparation method of reduced graphene oxide / bismuth vanadate / graphite phase carbon nitride composite nano material, in particular to a Z-type heterostructure of reduced graphene oxide bismuth vanadate / Graphite phase carbon nitride composite material and its preparation method and application. technical background [0002] Graphitic carbon nitride (g-C 3 N 4 ), as a new type of non-metallic polymer semiconductor material, has the characteristics of narrow band gap (2.7eV), non-toxic, low cost, and good thermal stability, which has attracted widespread attention. However, pure g-C in practical applications 3 N 4 The photogenerated electron-hole pairs are easy to recombine, resulting in low photocatalytic activity. In recent years, building a Z-type photocatalytic system is an effective way to improve the photocatalytic performance of semiconductors. This special heterojunction can not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/10C02F1/30C02F103/34C02F101/38
CPCB01J27/24B01J35/004B01J37/10C02F1/30C02F2101/38C02F2103/343C02F2305/10
Inventor 马婉霞姜德立陈敏肖鹏
Owner JIANGSU UNIV
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